diff --git a/applications/solvers/compressible/rhoCentralFoam/Allwclean b/applications/solvers/compressible/rhoCentralFoam/Allwclean
index 6ccfad7e88..b9be2951e1 100755
--- a/applications/solvers/compressible/rhoCentralFoam/Allwclean
+++ b/applications/solvers/compressible/rhoCentralFoam/Allwclean
@@ -4,6 +4,5 @@ cd "${0%/*}" || exit    # Run from this directory
 
 wclean libso BCs
 wclean
-wclean rhoCentralDyMFoam
 
 #------------------------------------------------------------------------------
diff --git a/applications/solvers/compressible/rhoCentralFoam/Allwmake b/applications/solvers/compressible/rhoCentralFoam/Allwmake
index 58d48467be..2145b78e85 100755
--- a/applications/solvers/compressible/rhoCentralFoam/Allwmake
+++ b/applications/solvers/compressible/rhoCentralFoam/Allwmake
@@ -5,8 +5,7 @@ cd "${0%/*}" || exit                                # Run from this directory
 
 (
     wmake $targetType BCs \
- && wmake $targetType \
- && wmake $targetType rhoCentralDyMFoam \
+ && wmake $targetType
 )
 
 #------------------------------------------------------------------------------
diff --git a/applications/solvers/compressible/rhoCentralFoam/Make/options b/applications/solvers/compressible/rhoCentralFoam/Make/options
index b18659e4c8..2b1b8035dc 100644
--- a/applications/solvers/compressible/rhoCentralFoam/Make/options
+++ b/applications/solvers/compressible/rhoCentralFoam/Make/options
@@ -7,7 +7,7 @@ EXE_INC = \
     -I$(LIB_SRC)/thermophysicalModels/specie/lnInclude \
     -I$(LIB_SRC)/TurbulenceModels/turbulenceModels/lnInclude \
     -I$(LIB_SRC)/TurbulenceModels/compressible/lnInclude \
-    -I$(LIB_SRC)/dynamicMesh/lnInclude
+    -I$(LIB_SRC)/dynamicFvMesh/lnInclude
 
 EXE_LIBS = \
     -lfiniteVolume \
@@ -18,4 +18,6 @@ EXE_LIBS = \
     -lspecie \
     -lrhoCentralFoam \
     -lturbulenceModels \
-    -lcompressibleTurbulenceModels
+    -lcompressibleTurbulenceModels \
+    -ldynamicFvMesh \
+    -ltopoChangerFvMesh
diff --git a/applications/solvers/compressible/rhoCentralFoam/rhoCentralDyMFoam/Make/files b/applications/solvers/compressible/rhoCentralFoam/rhoCentralDyMFoam/Make/files
deleted file mode 100644
index f78400aa8d..0000000000
--- a/applications/solvers/compressible/rhoCentralFoam/rhoCentralDyMFoam/Make/files
+++ /dev/null
@@ -1,3 +0,0 @@
-rhoCentralDyMFoam.C
-
-EXE = $(FOAM_APPBIN)/rhoCentralDyMFoam
diff --git a/applications/solvers/compressible/rhoCentralFoam/rhoCentralDyMFoam/Make/options b/applications/solvers/compressible/rhoCentralFoam/rhoCentralDyMFoam/Make/options
deleted file mode 100644
index 1489edb1b5..0000000000
--- a/applications/solvers/compressible/rhoCentralFoam/rhoCentralDyMFoam/Make/options
+++ /dev/null
@@ -1,26 +0,0 @@
-EXE_INC = \
-    -I.. \
-    -I../BCs/lnInclude \
-    -I$(LIB_SRC)/finiteVolume/lnInclude \
-    -I$(LIB_SRC)/meshTools/lnInclude \
-    -I$(LIB_SRC)/transportModels/compressible/lnInclude \
-    -I$(LIB_SRC)/thermophysicalModels/basic/lnInclude \
-    -I$(LIB_SRC)/thermophysicalModels/specie/lnInclude \
-    -I$(LIB_SRC)/TurbulenceModels/turbulenceModels/lnInclude \
-    -I$(LIB_SRC)/TurbulenceModels/compressible/lnInclude \
-    -I$(LIB_SRC)/dynamicMesh/lnInclude \
-    -I$(LIB_SRC)/dynamicFvMesh/lnInclude
-
-EXE_LIBS = \
-    -lfiniteVolume \
-    -lfvOptions \
-    -lmeshTools \
-    -lcompressibleTransportModels \
-    -lfluidThermophysicalModels \
-    -lspecie \
-    -lrhoCentralFoam \
-    -lturbulenceModels \
-    -lcompressibleTurbulenceModels \
-    -ldynamicMesh \
-    -ldynamicFvMesh \
-    -ltopoChangerFvMesh
diff --git a/applications/solvers/compressible/rhoCentralFoam/rhoCentralDyMFoam/rhoCentralDyMFoam.C b/applications/solvers/compressible/rhoCentralFoam/rhoCentralDyMFoam/rhoCentralDyMFoam.C
deleted file mode 100644
index 662287d831..0000000000
--- a/applications/solvers/compressible/rhoCentralFoam/rhoCentralDyMFoam/rhoCentralDyMFoam.C
+++ /dev/null
@@ -1,288 +0,0 @@
-/*---------------------------------------------------------------------------*\
-  =========                 |
-  \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
-   \\    /   O peration     |
-    \\  /    A nd           | www.openfoam.com
-     \\/     M anipulation  |
--------------------------------------------------------------------------------
-    Copyright (C) 2011-2016 OpenFOAM Foundation
--------------------------------------------------------------------------------
-License
-    This file is part of OpenFOAM.
-
-    OpenFOAM is free software: you can redistribute it and/or modify it
-    under the terms of the GNU General Public License as published by
-    the Free Software Foundation, either version 3 of the License, or
-    (at your option) any later version.
-
-    OpenFOAM is distributed in the hope that it will be useful, but WITHOUT
-    ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
-    FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
-    for more details.
-
-    You should have received a copy of the GNU General Public License
-    along with OpenFOAM.  If not, see <http://www.gnu.org/licenses/>.
-
-Application
-    rhoCentralDyMFoam
-
-Group
-    grpCompressibleSolvers grpMovingMeshSolvers
-
-Description
-    Density-based compressible flow solver based on central-upwind
-    schemes of Kurganov and Tadmor
-    with support for mesh-motion and topology changes.
-
-\*---------------------------------------------------------------------------*/
-
-#include "fvCFD.H"
-#include "dynamicFvMesh.H"
-#include "psiThermo.H"
-#include "turbulentFluidThermoModel.H"
-#include "fixedRhoFvPatchScalarField.H"
-#include "directionInterpolate.H"
-#include "localEulerDdtScheme.H"
-#include "fvcSmooth.H"
-#include "motionSolver.H"
-
-// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
-
-int main(int argc, char *argv[])
-{
-    argList::addNote
-    (
-        "Density-based compressible flow solver based on central-upwind"
-        " schemes of Kurganov and Tadmor.\n"
-        "With support for mesh-motion and topology changes."
-    );
-
-    #define NO_CONTROL
-    #include "postProcess.H"
-
-    #include "setRootCaseLists.H"
-    #include "createTime.H"
-    #include "createDynamicFvMesh.H"
-    #include "createFields.H"
-    #include "createFieldRefs.H"
-    #include "createTimeControls.H"
-
-    turbulence->validate();
-
-    // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
-
-    #include "readFluxScheme.H"
-
-    const dimensionedScalar v_zero(dimVolume/dimTime, Zero);
-
-    // Courant numbers used to adjust the time-step
-    scalar CoNum = 0.0;
-    scalar meanCoNum = 0.0;
-
-    Info<< "\nStarting time loop\n" << endl;
-
-    while (runTime.run())
-    {
-        #include "readTimeControls.H"
-        #include "setDeltaT.H"
-
-        ++runTime;
-
-        Info<< "Time = " << runTime.timeName() << nl << endl;
-
-        // Do any mesh changes
-        mesh.update();
-
-        // --- Directed interpolation of primitive fields onto faces
-
-        surfaceScalarField rho_pos(interpolate(rho, pos));
-        surfaceScalarField rho_neg(interpolate(rho, neg));
-
-        surfaceVectorField rhoU_pos(interpolate(rhoU, pos, U.name()));
-        surfaceVectorField rhoU_neg(interpolate(rhoU, neg, U.name()));
-
-        volScalarField rPsi("rPsi", 1.0/psi);
-        surfaceScalarField rPsi_pos(interpolate(rPsi, pos, T.name()));
-        surfaceScalarField rPsi_neg(interpolate(rPsi, neg, T.name()));
-
-        surfaceScalarField e_pos(interpolate(e, pos, T.name()));
-        surfaceScalarField e_neg(interpolate(e, neg, T.name()));
-
-        surfaceVectorField U_pos("U_pos", rhoU_pos/rho_pos);
-        surfaceVectorField U_neg("U_neg", rhoU_neg/rho_neg);
-
-        surfaceScalarField p_pos("p_pos", rho_pos*rPsi_pos);
-        surfaceScalarField p_neg("p_neg", rho_neg*rPsi_neg);
-
-        surfaceScalarField phiv_pos("phiv_pos", U_pos & mesh.Sf());
-        surfaceScalarField phiv_neg("phiv_neg", U_neg & mesh.Sf());
-
-        // Make fluxes relative to mesh-motion
-        if (mesh.moving())
-        {
-            phiv_pos -= mesh.phi();
-            phiv_neg -= mesh.phi();
-        }
-        // Note: extracted out the orientation so becomes unoriented
-        phiv_pos.setOriented(false);
-        phiv_neg.setOriented(false);
-
-        volScalarField c("c", sqrt(thermo.Cp()/thermo.Cv()*rPsi));
-        surfaceScalarField cSf_pos
-        (
-            "cSf_pos",
-            interpolate(c, pos, T.name())*mesh.magSf()
-        );
-        surfaceScalarField cSf_neg
-        (
-            "cSf_neg",
-            interpolate(c, neg, T.name())*mesh.magSf()
-        );
-
-        surfaceScalarField ap
-        (
-            "ap",
-            max(max(phiv_pos + cSf_pos, phiv_neg + cSf_neg), v_zero)
-        );
-        surfaceScalarField am
-        (
-            "am",
-            min(min(phiv_pos - cSf_pos, phiv_neg - cSf_neg), v_zero)
-        );
-
-        surfaceScalarField a_pos("a_pos", ap/(ap - am));
-
-        surfaceScalarField amaxSf("amaxSf", max(mag(am), mag(ap)));
-
-        surfaceScalarField aSf("aSf", am*a_pos);
-
-        if (fluxScheme == "Tadmor")
-        {
-            aSf = -0.5*amaxSf;
-            a_pos = 0.5;
-        }
-
-        surfaceScalarField a_neg("a_neg", 1.0 - a_pos);
-
-        phiv_pos *= a_pos;
-        phiv_neg *= a_neg;
-
-        surfaceScalarField aphiv_pos("aphiv_pos", phiv_pos - aSf);
-        surfaceScalarField aphiv_neg("aphiv_neg", phiv_neg + aSf);
-
-        // Reuse amaxSf for the maximum positive and negative fluxes
-        // estimated by the central scheme
-        amaxSf = max(mag(aphiv_pos), mag(aphiv_neg));
-
-        #include "centralCourantNo.H"
-
-        phi = aphiv_pos*rho_pos + aphiv_neg*rho_neg;
-
-        surfaceVectorField phiU(aphiv_pos*rhoU_pos + aphiv_neg*rhoU_neg);
-        // Note: reassembled orientation from the pos and neg parts so becomes
-        // oriented
-        phiU.setOriented(true);
-
-        surfaceVectorField phiUp(phiU + (a_pos*p_pos + a_neg*p_neg)*mesh.Sf());
-
-        surfaceScalarField phiEp
-        (
-            "phiEp",
-            aphiv_pos*(rho_pos*(e_pos + 0.5*magSqr(U_pos)) + p_pos)
-          + aphiv_neg*(rho_neg*(e_neg + 0.5*magSqr(U_neg)) + p_neg)
-          + aSf*p_pos - aSf*p_neg
-        );
-
-        // Make flux for pressure-work absolute
-        if (mesh.moving())
-        {
-            surfaceScalarField phia(a_pos*p_pos + a_neg*p_neg);
-            phia.setOriented(true);
-
-            phiEp += mesh.phi()*phia;
-        }
-
-        volScalarField muEff("muEff", turbulence->muEff());
-        volTensorField tauMC("tauMC", muEff*dev2(Foam::T(fvc::grad(U))));
-
-        // --- Solve density
-        solve(fvm::ddt(rho) + fvc::div(phi));
-
-        // --- Solve momentum
-        solve(fvm::ddt(rhoU) + fvc::div(phiUp));
-
-        U.ref() =
-            rhoU()
-           /rho();
-        U.correctBoundaryConditions();
-        rhoU.boundaryFieldRef() == rho.boundaryField()*U.boundaryField();
-
-        if (!inviscid)
-        {
-            solve
-            (
-                fvm::ddt(rho, U) - fvc::ddt(rho, U)
-              - fvm::laplacian(muEff, U)
-              - fvc::div(tauMC)
-            );
-            rhoU = rho*U;
-        }
-
-        // --- Solve energy
-        surfaceScalarField sigmaDotU
-        (
-            "sigmaDotU",
-            (
-                fvc::interpolate(muEff)*mesh.magSf()*fvc::snGrad(U)
-              + fvc::dotInterpolate(mesh.Sf(), tauMC)
-            )
-          & (a_pos*U_pos + a_neg*U_neg)
-        );
-
-        solve
-        (
-            fvm::ddt(rhoE)
-          + fvc::div(phiEp)
-          - fvc::div(sigmaDotU)
-        );
-
-        e = rhoE/rho - 0.5*magSqr(U);
-        e.correctBoundaryConditions();
-        thermo.correct();
-        rhoE.boundaryFieldRef() ==
-            rho.boundaryField()*
-            (
-                e.boundaryField() + 0.5*magSqr(U.boundaryField())
-            );
-
-        if (!inviscid)
-        {
-            solve
-            (
-                fvm::ddt(rho, e) - fvc::ddt(rho, e)
-              - fvm::laplacian(turbulence->alphaEff(), e)
-            );
-            thermo.correct();
-            rhoE = rho*(e + 0.5*magSqr(U));
-        }
-
-        p.ref() =
-            rho()
-           /psi();
-        p.correctBoundaryConditions();
-        rho.boundaryFieldRef() == psi.boundaryField()*p.boundaryField();
-
-        turbulence->correct();
-
-        runTime.write();
-
-        runTime.printExecutionTime(Info);
-    }
-
-    Info<< "End\n" << endl;
-
-    return 0;
-}
-
-
-// ************************************************************************* //
diff --git a/applications/solvers/compressible/rhoCentralFoam/rhoCentralFoam.C b/applications/solvers/compressible/rhoCentralFoam/rhoCentralFoam.C
index 0cb9966a13..84379df585 100644
--- a/applications/solvers/compressible/rhoCentralFoam/rhoCentralFoam.C
+++ b/applications/solvers/compressible/rhoCentralFoam/rhoCentralFoam.C
@@ -6,6 +6,7 @@
      \\/     M anipulation  |
 -------------------------------------------------------------------------------
     Copyright (C) 2011-2016 OpenFOAM Foundation
+    Copyright (C) 2021 OpenCFD Ltd.
 -------------------------------------------------------------------------------
 License
     This file is part of OpenFOAM.
@@ -30,12 +31,14 @@ Group
     grpCompressibleSolvers
 
 Description
-    Density-based compressible flow solver based on central-upwind
-    schemes of Kurganov and Tadmor.
+    Density-based compressible flow solver based on
+    central-upwind schemes of Kurganov and Tadmor with
+    support for mesh-motion and topology changes.
 
 \*---------------------------------------------------------------------------*/
 
 #include "fvCFD.H"
+#include "dynamicFvMesh.H"
 #include "psiThermo.H"
 #include "turbulentFluidThermoModel.H"
 #include "fixedRhoFvPatchScalarField.H"
@@ -49,8 +52,9 @@ int main(int argc, char *argv[])
 {
     argList::addNote
     (
-        "Density-based compressible flow solver based on central-upwind"
-        " schemes of Kurganov and Tadmor."
+        "Density-based compressible flow solver based on"
+        " central-upwind schemes of Kurganov and Tadmor with"
+        " support for mesh-motion and topology changes."
     );
 
     #define NO_CONTROL
@@ -59,7 +63,7 @@ int main(int argc, char *argv[])
     #include "addCheckCaseOptions.H"
     #include "setRootCaseLists.H"
     #include "createTime.H"
-    #include "createMesh.H"
+    #include "createDynamicFvMesh.H"
     #include "createFields.H"
     #include "createFieldRefs.H"
     #include "createTimeControls.H"
@@ -80,6 +84,18 @@ int main(int argc, char *argv[])
 
     while (runTime.run())
     {
+        #include "readTimeControls.H"
+
+        if (!LTS)
+        {
+            #include "setDeltaT.H"
+
+            ++runTime;
+
+            // Do any mesh changes
+            mesh.update();
+        }
+
         // --- Directed interpolation of primitive fields onto faces
 
         surfaceScalarField rho_pos(interpolate(rho, pos));
@@ -107,6 +123,15 @@ int main(int argc, char *argv[])
         surfaceScalarField phiv_neg("phiv_neg", U_neg & mesh.Sf());
         phiv_neg.setOriented(false);
 
+        // Make fluxes relative to mesh-motion
+        if (mesh.moving())
+        {
+            surfaceScalarField meshPhi(mesh.phi());
+            meshPhi.setOriented(false);
+            phiv_pos -= meshPhi;
+            phiv_neg -= meshPhi;
+        }
+
         volScalarField c("c", sqrt(thermo.Cp()/thermo.Cv()*rPsi));
         surfaceScalarField cSf_pos
         (
@@ -157,18 +182,13 @@ int main(int argc, char *argv[])
         amaxSf = max(mag(aphiv_pos), mag(aphiv_neg));
 
         #include "centralCourantNo.H"
-        #include "readTimeControls.H"
 
         if (LTS)
         {
             #include "setRDeltaT.H"
-        }
-        else
-        {
-            #include "setDeltaT.H"
-        }
 
-        ++runTime;
+            ++runTime;
+        }
 
         Info<< "Time = " << runTime.timeName() << nl << endl;
 
@@ -189,6 +209,14 @@ int main(int argc, char *argv[])
           + aSf*p_pos - aSf*p_neg
         );
 
+        // Make flux for pressure-work absolute
+        if (mesh.moving())
+        {
+            surfaceScalarField meshPhi(mesh.phi());
+            meshPhi.setOriented(false);
+            phiEp += meshPhi*(a_pos*p_pos + a_neg*p_neg);
+        }
+
         volScalarField muEff("muEff", turbulence->muEff());
         volTensorField tauMC("tauMC", muEff*dev2(Foam::T(fvc::grad(U))));
 
diff --git a/applications/solvers/heatTransfer/buoyantBoussinesqPimpleFoam/Make/options b/applications/solvers/heatTransfer/buoyantBoussinesqPimpleFoam/Make/options
index 59302f6e45..c5cad12447 100644
--- a/applications/solvers/heatTransfer/buoyantBoussinesqPimpleFoam/Make/options
+++ b/applications/solvers/heatTransfer/buoyantBoussinesqPimpleFoam/Make/options
@@ -1,8 +1,11 @@
 EXE_INC = \
     -I../buoyantBoussinesqSimpleFoam \
+    -I../../incompressible/pimpleFoam \
     -I$(LIB_SRC)/sampling/lnInclude \
     -I$(LIB_SRC)/finiteVolume/lnInclude \
     -I$(LIB_SRC)/meshTools/lnInclude \
+    -I$(LIB_SRC)/dynamicMesh/lnInclude \
+    -I$(LIB_SRC)/dynamicFvMesh/lnInclude \
     -I$(LIB_SRC)/TurbulenceModels/turbulenceModels/lnInclude \
     -I$(LIB_SRC)/TurbulenceModels/incompressible/lnInclude \
     -I$(LIB_SRC)/transportModels \
@@ -13,6 +16,8 @@ EXE_LIBS = \
     -lfiniteVolume \
     -lfvOptions \
     -lmeshTools \
+    -ldynamicMesh \
+    -ldynamicFvMesh \
     -lsampling \
     -lturbulenceModels \
     -lincompressibleTurbulenceModels \
diff --git a/applications/solvers/heatTransfer/buoyantBoussinesqPimpleFoam/buoyantBoussinesqPimpleFoam.C b/applications/solvers/heatTransfer/buoyantBoussinesqPimpleFoam/buoyantBoussinesqPimpleFoam.C
index 4ac185c121..58d5deef52 100644
--- a/applications/solvers/heatTransfer/buoyantBoussinesqPimpleFoam/buoyantBoussinesqPimpleFoam.C
+++ b/applications/solvers/heatTransfer/buoyantBoussinesqPimpleFoam/buoyantBoussinesqPimpleFoam.C
@@ -6,6 +6,7 @@
      \\/     M anipulation  |
 -------------------------------------------------------------------------------
     Copyright (C) 2011-2017 OpenFOAM Foundation
+    Copyright (C) 2021 OpenCFD Ltd.
 -------------------------------------------------------------------------------
 License
     This file is part of OpenFOAM.
@@ -30,7 +31,8 @@ Group
     grpHeatTransferSolvers
 
 Description
-    Transient solver for buoyant, turbulent flow of incompressible fluids.
+    Transient solver for buoyant, turbulent flow of incompressible fluids,
+    with optional mesh motion and mesh topology changes.
 
     Uses the Boussinesq approximation:
     \f[
@@ -51,9 +53,11 @@ Description
 \*---------------------------------------------------------------------------*/
 
 #include "fvCFD.H"
+#include "dynamicFvMesh.H"
 #include "singlePhaseTransportModel.H"
 #include "turbulentTransportModel.H"
 #include "radiationModel.H"
+#include "CorrectPhi.H"
 #include "fvOptions.H"
 #include "pimpleControl.H"
 
@@ -64,7 +68,8 @@ int main(int argc, char *argv[])
     argList::addNote
     (
         "Transient solver for buoyant, turbulent flow"
-        " of incompressible fluids.\n"
+        " of incompressible fluids, with optional mesh"
+        " motion and mesh topology changes.\n"
         "Uses the Boussinesq approximation."
     );
 
@@ -73,10 +78,10 @@ int main(int argc, char *argv[])
     #include "addCheckCaseOptions.H"
     #include "setRootCaseLists.H"
     #include "createTime.H"
-    #include "createMesh.H"
-    #include "createControl.H"
+    #include "createDynamicFvMesh.H"
+    #include "createDyMControls.H"
     #include "createFields.H"
-    #include "createTimeControls.H"
+    #include "createUfIfPresent.H"
     #include "CourantNo.H"
     #include "setInitialDeltaT.H"
     #include "initContinuityErrs.H"
@@ -89,7 +94,7 @@ int main(int argc, char *argv[])
 
     while (runTime.run())
     {
-        #include "readTimeControls.H"
+        #include "readDyMControls.H"
         #include "CourantNo.H"
         #include "setDeltaT.H"
 
@@ -100,6 +105,34 @@ int main(int argc, char *argv[])
         // --- Pressure-velocity PIMPLE corrector loop
         while (pimple.loop())
         {
+            if (pimple.firstIter() || moveMeshOuterCorrectors)
+            {
+                // Do any mesh changes
+                mesh.controlledUpdate();
+
+                if (mesh.changing())
+                {
+                    MRF.update();
+
+                    if (correctPhi)
+                    {
+                        // Calculate absolute flux
+                        // from the mapped surface velocity
+                        phi = mesh.Sf() & Uf();
+
+                        #include "correctPhi.H"
+
+                        // Make the flux relative to the mesh motion
+                        fvc::makeRelative(phi, U);
+                    }
+
+                    if (checkMeshCourantNo)
+                    {
+                        #include "meshCourantNo.H"
+                    }
+                }
+            }
+
             #include "UEqn.H"
             #include "TEqn.H"
 
diff --git a/applications/solvers/heatTransfer/buoyantBoussinesqPimpleFoam/pEqn.H b/applications/solvers/heatTransfer/buoyantBoussinesqPimpleFoam/pEqn.H
index 0eeb6e15a3..d6f04136dd 100644
--- a/applications/solvers/heatTransfer/buoyantBoussinesqPimpleFoam/pEqn.H
+++ b/applications/solvers/heatTransfer/buoyantBoussinesqPimpleFoam/pEqn.H
@@ -42,6 +42,12 @@
             U = HbyA + rAU*fvc::reconstruct((phig - p_rghEqn.flux())/rAUf);
             U.correctBoundaryConditions();
             fvOptions.correct(U);
+
+            // Correct Uf if the mesh is moving
+            fvc::correctUf(Uf, U, phi);
+
+            // Make the fluxes relative to the mesh motion
+            fvc::makeRelative(phi, U);
         }
     }
 
diff --git a/applications/solvers/heatTransfer/buoyantPimpleFoam/Make/options b/applications/solvers/heatTransfer/buoyantPimpleFoam/Make/options
index d3224df411..a9b16d2f25 100644
--- a/applications/solvers/heatTransfer/buoyantPimpleFoam/Make/options
+++ b/applications/solvers/heatTransfer/buoyantPimpleFoam/Make/options
@@ -1,4 +1,5 @@
 EXE_INC = \
+    -I../../compressible/rhoPimpleFoam \
     -I$(LIB_SRC)/finiteVolume/lnInclude \
     -I$(LIB_SRC)/meshTools/lnInclude \
     -I$(LIB_SRC)/sampling/lnInclude \
@@ -7,6 +8,8 @@ EXE_INC = \
     -I$(LIB_SRC)/thermophysicalModels/radiation/lnInclude \
     -I$(LIB_SRC)/TurbulenceModels/turbulenceModels/lnInclude \
     -I$(LIB_SRC)/TurbulenceModels/compressible/lnInclude \
+    -I$(LIB_SRC)/dynamicMesh/lnInclude \
+    -I$(LIB_SRC)/dynamicFvMesh/lnInclude \
     -I$(LIB_SRC)/regionFaModels\lnInclude
 
 EXE_LIBS = \
@@ -21,4 +24,7 @@ EXE_LIBS = \
     -lturbulenceModels \
     -lcompressibleTurbulenceModels \
     -latmosphericModels \
+    -ldynamicMesh \
+    -ldynamicFvMesh \
+    -ltopoChangerFvMesh \
     -lregionFaModels
diff --git a/applications/solvers/heatTransfer/buoyantPimpleFoam/buoyantPimpleFoam.C b/applications/solvers/heatTransfer/buoyantPimpleFoam/buoyantPimpleFoam.C
index 691916c17e..70595ebba3 100644
--- a/applications/solvers/heatTransfer/buoyantPimpleFoam/buoyantPimpleFoam.C
+++ b/applications/solvers/heatTransfer/buoyantPimpleFoam/buoyantPimpleFoam.C
@@ -6,6 +6,7 @@
      \\/     M anipulation  |
 -------------------------------------------------------------------------------
     Copyright (C) 2011-2017 OpenFOAM Foundation
+    Copyright (C) 2021 OpenCFD Ltd.
 -------------------------------------------------------------------------------
 License
     This file is part of OpenFOAM.
@@ -30,8 +31,9 @@ Group
     grpHeatTransferSolvers
 
 Description
-    Transient solver for buoyant, turbulent flow of compressible fluids for
-    ventilation and heat-transfer.
+    Transient solver for buoyant, turbulent flow of compressible fluids
+    for ventilation and heat-transfer, with optional mesh motion
+    and mesh topology changes.
 
     Turbulence is modelled using a run-time selectable compressible RAS or
     LES model.
@@ -39,12 +41,16 @@ Description
 \*---------------------------------------------------------------------------*/
 
 #include "fvCFD.H"
+#include "dynamicFvMesh.H"
 #include "rhoThermo.H"
 #include "turbulentFluidThermoModel.H"
 #include "radiationModel.H"
+#include "CorrectPhi.H"
 #include "fvOptions.H"
 #include "pimpleControl.H"
 #include "pressureControl.H"
+#include "localEulerDdtScheme.H"
+#include "fvcSmooth.H"
 
 // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
@@ -53,7 +59,8 @@ int main(int argc, char *argv[])
     argList::addNote
     (
         "Transient solver for buoyant, turbulent fluid flow"
-        " of compressible fluids, including radiation."
+        " of compressible fluids, including radiation,"
+        " with optional mesh motion and mesh topology changes."
     );
 
     #include "postProcess.H"
@@ -61,36 +68,105 @@ int main(int argc, char *argv[])
     #include "addCheckCaseOptions.H"
     #include "setRootCaseLists.H"
     #include "createTime.H"
-    #include "createMesh.H"
-    #include "createControl.H"
+    #include "createDynamicFvMesh.H"
+    #include "createDyMControls.H"
+    #include "initContinuityErrs.H"
     #include "createFields.H"
     #include "createFieldRefs.H"
-    #include "initContinuityErrs.H"
-    #include "createTimeControls.H"
-    #include "compressibleCourantNo.H"
-    #include "setInitialDeltaT.H"
+    #include "createRhoUfIfPresent.H"
 
     turbulence->validate();
 
+    if (!LTS)
+    {
+        #include "compressibleCourantNo.H"
+        #include "setInitialDeltaT.H"
+    }
+
     // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
     Info<< "\nStarting time loop\n" << endl;
 
     while (runTime.run())
     {
-        #include "readTimeControls.H"
-        #include "compressibleCourantNo.H"
-        #include "setDeltaT.H"
+        #include "readDyMControls.H"
+
+        // Store divrhoU from the previous mesh
+        // so that it can be mapped and used in correctPhi
+        // to ensure the corrected phi has the same divergence
+        autoPtr<volScalarField> divrhoU;
+        if (correctPhi)
+        {
+            divrhoU.reset
+            (
+                new volScalarField
+                (
+                    "divrhoU",
+                    fvc::div(fvc::absolute(phi, rho, U))
+                )
+            );
+        }
+
+        if (LTS)
+        {
+            #include "setRDeltaT.H"
+        }
+        else
+        {
+            #include "compressibleCourantNo.H"
+            #include "setDeltaT.H"
+        }
 
         ++runTime;
 
         Info<< "Time = " << runTime.timeName() << nl << endl;
 
-        #include "rhoEqn.H"
-
         // --- Pressure-velocity PIMPLE corrector loop
         while (pimple.loop())
         {
+            if (pimple.firstIter() || moveMeshOuterCorrectors)
+            {
+                // Store momentum to set rhoUf for introduced faces.
+                autoPtr<volVectorField> rhoU;
+                if (rhoUf.valid())
+                {
+                    rhoU.reset(new volVectorField("rhoU", rho*U));
+                }
+
+                // Do any mesh changes
+                mesh.update();
+
+                if (mesh.changing())
+                {
+                    gh = (g & mesh.C()) - ghRef;
+                    ghf = (g & mesh.Cf()) - ghRef;
+
+                    MRF.update();
+
+                    if (correctPhi)
+                    {
+                        // Calculate absolute flux
+                        // from the mapped surface velocity
+                        phi = mesh.Sf() & rhoUf();
+
+                        #include "correctPhi.H"
+
+                        // Make the fluxes relative to the mesh-motion
+                        fvc::makeRelative(phi, rho, U);
+                    }
+
+                    if (checkMeshCourantNo)
+                    {
+                        #include "meshCourantNo.H"
+                    }
+                }
+            }
+
+            if (pimple.firstIter() && !pimple.SIMPLErho())
+            {
+                #include "rhoEqn.H"
+            }
+
             #include "UEqn.H"
             #include "EEqn.H"
 
diff --git a/applications/solvers/heatTransfer/buoyantPimpleFoam/createFields.H b/applications/solvers/heatTransfer/buoyantPimpleFoam/createFields.H
index 22dc129a87..813d1c3240 100644
--- a/applications/solvers/heatTransfer/buoyantPimpleFoam/createFields.H
+++ b/applications/solvers/heatTransfer/buoyantPimpleFoam/createFields.H
@@ -1,3 +1,5 @@
+#include "createRDeltaT.H"
+
 Info<< "Reading thermophysical properties\n" << endl;
 
 autoPtr<rhoThermo> pThermo(rhoThermo::New(mesh));
diff --git a/applications/solvers/heatTransfer/buoyantPimpleFoam/pEqn.H b/applications/solvers/heatTransfer/buoyantPimpleFoam/pEqn.H
index 886f9c6a5f..733e97028d 100644
--- a/applications/solvers/heatTransfer/buoyantPimpleFoam/pEqn.H
+++ b/applications/solvers/heatTransfer/buoyantPimpleFoam/pEqn.H
@@ -28,6 +28,8 @@ MRF.makeRelative(fvc::interpolate(rho), phiHbyA);
 // Update the pressure BCs to ensure flux consistency
 constrainPressure(p_rgh, rho, U, phiHbyA, rhorAUf, MRF);
 
+fvc::makeRelative(phiHbyA, rho, U);
+
 fvScalarMatrix p_rghDDtEqn
 (
     fvc::ddt(rho) + psi*correction(fvm::ddt(p_rgh))
@@ -104,7 +106,15 @@ else
 
 rho = thermo.rho();
 
+// Correct rhoUf if the mesh is moving
+fvc::correctRhoUf(rhoUf, rho, U, phi);
+
 if (thermo.dpdt())
 {
     dpdt = fvc::ddt(p);
+
+    if (mesh.moving())
+    {
+        dpdt -= fvc::div(fvc::meshPhi(rho, U), p);
+    }
 }
diff --git a/tutorials/compressible/rhoCentralDyMFoam/movingCone/0/T b/tutorials/compressible/rhoCentralFoam/movingCone/0/T
similarity index 100%
rename from tutorials/compressible/rhoCentralDyMFoam/movingCone/0/T
rename to tutorials/compressible/rhoCentralFoam/movingCone/0/T
diff --git a/tutorials/compressible/rhoCentralDyMFoam/movingCone/0/U b/tutorials/compressible/rhoCentralFoam/movingCone/0/U
similarity index 100%
rename from tutorials/compressible/rhoCentralDyMFoam/movingCone/0/U
rename to tutorials/compressible/rhoCentralFoam/movingCone/0/U
diff --git a/tutorials/compressible/rhoCentralDyMFoam/movingCone/0/p b/tutorials/compressible/rhoCentralFoam/movingCone/0/p
similarity index 100%
rename from tutorials/compressible/rhoCentralDyMFoam/movingCone/0/p
rename to tutorials/compressible/rhoCentralFoam/movingCone/0/p
diff --git a/tutorials/compressible/rhoCentralDyMFoam/movingCone/0/pointMotionUx b/tutorials/compressible/rhoCentralFoam/movingCone/0/pointMotionUx
similarity index 100%
rename from tutorials/compressible/rhoCentralDyMFoam/movingCone/0/pointMotionUx
rename to tutorials/compressible/rhoCentralFoam/movingCone/0/pointMotionUx
diff --git a/tutorials/compressible/rhoCentralDyMFoam/movingCone/constant/dynamicMeshDict b/tutorials/compressible/rhoCentralFoam/movingCone/constant/dynamicMeshDict
similarity index 100%
rename from tutorials/compressible/rhoCentralDyMFoam/movingCone/constant/dynamicMeshDict
rename to tutorials/compressible/rhoCentralFoam/movingCone/constant/dynamicMeshDict
diff --git a/tutorials/compressible/rhoCentralDyMFoam/movingCone/constant/thermophysicalProperties b/tutorials/compressible/rhoCentralFoam/movingCone/constant/thermophysicalProperties
similarity index 100%
rename from tutorials/compressible/rhoCentralDyMFoam/movingCone/constant/thermophysicalProperties
rename to tutorials/compressible/rhoCentralFoam/movingCone/constant/thermophysicalProperties
diff --git a/tutorials/compressible/rhoCentralDyMFoam/movingCone/constant/turbulenceProperties b/tutorials/compressible/rhoCentralFoam/movingCone/constant/turbulenceProperties
similarity index 100%
rename from tutorials/compressible/rhoCentralDyMFoam/movingCone/constant/turbulenceProperties
rename to tutorials/compressible/rhoCentralFoam/movingCone/constant/turbulenceProperties
diff --git a/tutorials/compressible/rhoCentralDyMFoam/movingCone/system/blockMeshDict b/tutorials/compressible/rhoCentralFoam/movingCone/system/blockMeshDict
similarity index 100%
rename from tutorials/compressible/rhoCentralDyMFoam/movingCone/system/blockMeshDict
rename to tutorials/compressible/rhoCentralFoam/movingCone/system/blockMeshDict
diff --git a/tutorials/compressible/rhoCentralDyMFoam/movingCone/system/controlDict b/tutorials/compressible/rhoCentralFoam/movingCone/system/controlDict
similarity index 97%
rename from tutorials/compressible/rhoCentralDyMFoam/movingCone/system/controlDict
rename to tutorials/compressible/rhoCentralFoam/movingCone/system/controlDict
index 1342119574..45ca953a39 100644
--- a/tutorials/compressible/rhoCentralDyMFoam/movingCone/system/controlDict
+++ b/tutorials/compressible/rhoCentralFoam/movingCone/system/controlDict
@@ -14,7 +14,7 @@ FoamFile
 }
 // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
-application     rhoCentralDyMFoam;
+application     rhoCentralFoam;
 
 startFrom       startTime;
 
diff --git a/tutorials/compressible/rhoCentralDyMFoam/movingCone/system/cuttingPlane b/tutorials/compressible/rhoCentralFoam/movingCone/system/cuttingPlane
similarity index 100%
rename from tutorials/compressible/rhoCentralDyMFoam/movingCone/system/cuttingPlane
rename to tutorials/compressible/rhoCentralFoam/movingCone/system/cuttingPlane
diff --git a/tutorials/compressible/rhoCentralDyMFoam/movingCone/system/fvSchemes b/tutorials/compressible/rhoCentralFoam/movingCone/system/fvSchemes
similarity index 100%
rename from tutorials/compressible/rhoCentralDyMFoam/movingCone/system/fvSchemes
rename to tutorials/compressible/rhoCentralFoam/movingCone/system/fvSchemes
diff --git a/tutorials/compressible/rhoCentralDyMFoam/movingCone/system/fvSolution b/tutorials/compressible/rhoCentralFoam/movingCone/system/fvSolution
similarity index 100%
rename from tutorials/compressible/rhoCentralDyMFoam/movingCone/system/fvSolution
rename to tutorials/compressible/rhoCentralFoam/movingCone/system/fvSolution