From bda07488f08606b7f446534561d742dc07d67656 Mon Sep 17 00:00:00 2001
From: Will Bainbridge <http://cfd.direct>
Date: Fri, 8 Jan 2021 10:45:09 +0000
Subject: [PATCH] volumetricFlowRateTriSurface: Corrected pre-configuration,
 and added an example

A volumetric flow rate through a tri-surface can now be obtained using
the volumetricFlowRateTriSurface preconfigured function object, using
the following entry in system/controlDict:

    fuctions
    {
        #includeFunc "volumetricFlowRateTriSurface(name=surface.stl)"
    }

Where "surface.stl" is a tri-surface file in the constant/triSurface
directory. An example of this has been added to the
incompressible/pimpleFoam/RAS/impeller tutorial case.

Note that when possible, it is preferable to use the flowRatePatch or
flowRateFaceZone functions, as these make direct use of the flux and
therefore report a value that is exactly that computed by the solver.
volumetricFlowRateTriSurface, by contrast, does interpolation of the
velocity field which introduces error.

In addition, a minor fix has been made to the underlying
surfaceFieldValue function object so that it does not need a zone/set
name when values on a searchable surface are requested.
---
 ...RateSurface => volumetricFlowRateTriSurface} |   4 ++--
 ...ace.cfg => volumetricFlowRateTriSurface.cfg} |   2 +-
 .../surfaceFieldValue/triSurfaceRegion.cfg      |   2 +-
 .../surfaceFieldValue/surfaceFieldValue.C       |   7 ++++---
 .../constant/triSurface/surface0.stl.gz         | Bin 0 -> 10660 bytes
 .../constant/triSurface/surface1.stl.gz         | Bin 0 -> 2235 bytes
 .../pimpleFoam/RAS/impeller/system/controlDict  |   7 +++++++
 7 files changed, 15 insertions(+), 7 deletions(-)
 rename etc/caseDicts/postProcessing/flowRate/{volFlowRateSurface => volumetricFlowRateTriSurface} (87%)
 rename etc/caseDicts/postProcessing/flowRate/{volFlowRateSurface.cfg => volumetricFlowRateTriSurface.cfg} (86%)
 create mode 100644 tutorials/incompressible/pimpleFoam/RAS/impeller/constant/triSurface/surface0.stl.gz
 create mode 100644 tutorials/incompressible/pimpleFoam/RAS/impeller/constant/triSurface/surface1.stl.gz

diff --git a/etc/caseDicts/postProcessing/flowRate/volFlowRateSurface b/etc/caseDicts/postProcessing/flowRate/volumetricFlowRateTriSurface
similarity index 87%
rename from etc/caseDicts/postProcessing/flowRate/volFlowRateSurface
rename to etc/caseDicts/postProcessing/flowRate/volumetricFlowRateTriSurface
index 20e40b6bea..eea56ae1af 100644
--- a/etc/caseDicts/postProcessing/flowRate/volFlowRateSurface
+++ b/etc/caseDicts/postProcessing/flowRate/volumetricFlowRateTriSurface
@@ -13,8 +13,8 @@ Description
 
 \*---------------------------------------------------------------------------*/
 
-triSurface <triSurfaceFile>;
+name    <triSurfaceFileName>;
 
-#includeEtc "caseDicts/postProcessing/flowRate/volFlowRateSurface.cfg"
+#includeEtc "caseDicts/postProcessing/flowRate/volumetricFlowRateTriSurface.cfg"
 
 // ************************************************************************* //
diff --git a/etc/caseDicts/postProcessing/flowRate/volFlowRateSurface.cfg b/etc/caseDicts/postProcessing/flowRate/volumetricFlowRateTriSurface.cfg
similarity index 86%
rename from etc/caseDicts/postProcessing/flowRate/volFlowRateSurface.cfg
rename to etc/caseDicts/postProcessing/flowRate/volumetricFlowRateTriSurface.cfg
index 1abafdfcfb..c42101c141 100644
--- a/etc/caseDicts/postProcessing/flowRate/volFlowRateSurface.cfg
+++ b/etc/caseDicts/postProcessing/flowRate/volumetricFlowRateTriSurface.cfg
@@ -6,7 +6,7 @@
      \\/     M anipulation  |
 \*---------------------------------------------------------------------------*/
 
-#includeEtc "caseDicts/postProcessing/surfaceFieldValue/surfaceRegion.cfg"
+#includeEtc "caseDicts/postProcessing/surfaceFieldValue/triSurfaceRegion.cfg"
 
 fields (U);
 operation areaNormalIntegrate;
diff --git a/etc/caseDicts/postProcessing/surfaceFieldValue/triSurfaceRegion.cfg b/etc/caseDicts/postProcessing/surfaceFieldValue/triSurfaceRegion.cfg
index bec4dde416..337849d690 100644
--- a/etc/caseDicts/postProcessing/surfaceFieldValue/triSurfaceRegion.cfg
+++ b/etc/caseDicts/postProcessing/surfaceFieldValue/triSurfaceRegion.cfg
@@ -13,7 +13,7 @@ regionType sampledSurface;
 sampledSurfaceDict
 {
     type        triSurfaceMesh;
-    surface     $triSurface;
+    surface     $name;
     source      cells;
     interpolate true;
 }
diff --git a/src/functionObjects/field/fieldValues/surfaceFieldValue/surfaceFieldValue.C b/src/functionObjects/field/fieldValues/surfaceFieldValue/surfaceFieldValue.C
index 4c43b12b6d..0103e844fa 100644
--- a/src/functionObjects/field/fieldValues/surfaceFieldValue/surfaceFieldValue.C
+++ b/src/functionObjects/field/fieldValues/surfaceFieldValue/surfaceFieldValue.C
@@ -2,7 +2,7 @@
   =========                 |
   \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
    \\    /   O peration     | Website:  https://openfoam.org
-    \\  /    A nd           | Copyright (C) 2011-2020 OpenFOAM Foundation
+    \\  /    A nd           | Copyright (C) 2011-2021 OpenFOAM Foundation
      \\/     M anipulation  |
 -------------------------------------------------------------------------------
 License
@@ -426,23 +426,24 @@ void Foam::functionObjects::fieldValues::surfaceFieldValue::initialise
     const dictionary& dict
 )
 {
-    dict.lookup("name") >> regionName_;
-
     switch (regionType_)
     {
         case regionTypes::faceZone:
         {
+            dict.lookup("name") >> regionName_;
             setFaceZoneFaces();
             break;
         }
         case regionTypes::patch:
         {
+            dict.lookup("name") >> regionName_;
             setPatchFaces();
             break;
         }
         case regionTypes::sampledSurface:
         {
             sampledSurfaceFaces(dict);
+            regionName_ = surfacePtr_().name();
             break;
         }
         default:
diff --git a/tutorials/incompressible/pimpleFoam/RAS/impeller/constant/triSurface/surface0.stl.gz b/tutorials/incompressible/pimpleFoam/RAS/impeller/constant/triSurface/surface0.stl.gz
new file mode 100644
index 0000000000000000000000000000000000000000..2e17a4d6f859556bdca32ff057c61ef6532c1c8e
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diff --git a/tutorials/incompressible/pimpleFoam/RAS/impeller/constant/triSurface/surface1.stl.gz b/tutorials/incompressible/pimpleFoam/RAS/impeller/constant/triSurface/surface1.stl.gz
new file mode 100644
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diff --git a/tutorials/incompressible/pimpleFoam/RAS/impeller/system/controlDict b/tutorials/incompressible/pimpleFoam/RAS/impeller/system/controlDict
index c800ec51e9..3c0698186d 100644
--- a/tutorials/incompressible/pimpleFoam/RAS/impeller/system/controlDict
+++ b/tutorials/incompressible/pimpleFoam/RAS/impeller/system/controlDict
@@ -49,5 +49,12 @@ adjustTimeStep  yes;
 
 maxCo           1.0;
 
+functions
+{
+    #includeFunc "flowRatePatch(name=inlet)"
+    #includeFunc "flowRatePatch(name=outlet)"
+    #includeFunc "volumetricFlowRateTriSurface(name=surface0.stl)"
+    #includeFunc "volumetricFlowRateTriSurface(name=surface1.stl)"
+}
 
 // ************************************************************************* //