Merge branch 'feature-curle-fo' into 'develop'

ENH: Updated Curle function object

See merge request Development/openfoam!373

src/functionObjects/field/Curle/Curle.C

@@ -43,57 +43,12 @@ namespace functionObjects
 }
 }
 
-
+const Foam::Enum<Foam::functionObjects::Curle::modeType>
-// * * * * * * * * * * * * Protected Member Functions  * * * * * * * * * * * //
+Foam::functionObjects::Curle::modeTypeNames_
-
+({
-bool Foam::functionObjects::Curle::calc()
+    { modeType::point, "point" },
-{
+    { modeType::surface, "surface" },
-    if (foundObject<volScalarField>(fieldName_))
+});
-    {
-        // Evaluate pressure force time derivative
-
-        const volScalarField& p = lookupObject<volScalarField>(fieldName_);
-        const volScalarField dpdt(scopedName("dpdt"), fvc::ddt(p));
-        const volScalarField::Boundary& dpdtBf = dpdt.boundaryField();
-        const surfaceVectorField::Boundary& SfBf = mesh_.Sf().boundaryField();
-
-        dimensionedVector dfdt("dfdt", p.dimensions()*dimArea/dimTime, Zero);
-
-        for (const label patchi : patchSet_)
-        {
-            dfdt.value() += sum(dpdtBf[patchi]*SfBf[patchi]);
-        }
-
-        reduce(dfdt.value(), sumOp<vector>());
-
-
-        // Construct and store Curle acoustic pressure
-
-        const volVectorField& C = mesh_.C();
-
-        auto tpDash = tmp<volScalarField>::New
-        (
-            IOobject
-            (
-                resultName_,
-                mesh_.time().timeName(),
-                mesh_,
-                IOobject::NO_READ,
-                IOobject::NO_WRITE
-            ),
-            mesh_,
-            dimensionedScalar(p.dimensions(), Zero)
-        );
-        auto& pDash = tpDash.ref();
-
-        const volVectorField d(scopedName("d"), C - x0_);
-        pDash = (d/magSqr(d) & dfdt)/(4.0*mathematical::pi*c0_);
-
-        return store(resultName_, tpDash);
-    }
-
-    return false;
-}
 
 
 // * * * * * * * * * * * * * * * * Constructors  * * * * * * * * * * * * * * //
@@ -105,14 +60,17 @@ Foam::functionObjects::Curle::Curle
     const dictionary& dict
 )
 :
-    fieldExpression(name, runTime, dict, "p"),
+    fvMeshFunctionObject(name, runTime, dict),
+    writeFile(mesh_, name),
+    pName_("p"),
     patchSet_(),
-    x0_("x0", dimLength,  Zero),
+    observerPositions_(),
-    c0_("c0", dimVelocity, Zero)
+    c0_(0),
+    rawFilePtrs_(),
+    inputSurface_(),
+    surfaceWriterPtr_(nullptr)
 {
     read(dict);
-
-    setResultName(typeName, fieldName_);
 }
 
 
@@ -120,13 +78,14 @@ Foam::functionObjects::Curle::Curle
 
 bool Foam::functionObjects::Curle::read(const dictionary& dict)
 {
-    if (fieldExpression::read(dict))
+    if (!(fvMeshFunctionObject::read(dict) && writeFile::read(dict)))
     {
-        patchSet_ =
+        return false;
-            mesh_.boundaryMesh().patchSet
+    }
-            (
+
-                dict.get<wordRes>("patches")
+    dict.readIfPresent("p", pName_);
-            );
+
+    patchSet_ = mesh_.boundaryMesh().patchSet(dict.get<wordRes>("patches"));
 
     if (patchSet_.empty())
     {
@@ -137,10 +96,87 @@ bool Foam::functionObjects::Curle::read(const dictionary& dict)
         return false;
     }
 
+    const modeType inputMode = modeTypeNames_.get("input", dict);
+
+    switch (inputMode)
+    {
+        case modeType::point:
+        {
+            observerPositions_ = dict.get<List<point>>("observerPositions");
+            break;
+        }
+        case modeType::surface:
+        {
+            const fileName fName = (dict.get<fileName>("surface")).expand();
+            inputSurface_ = MeshedSurface<face>(fName);
+
+            observerPositions_ = inputSurface_.Cf();
+        }
+    }
+
+    if (observerPositions_.empty())
+    {
+        WarningInFunction
+            << "No observer positions defined"
+            << endl;
+
+        return false;
+    }
+
+    const auto outputMode = modeTypeNames_.get("output", dict);
+
+    switch (outputMode)
+    {
+        case modeType::point:
+        {
+            rawFilePtrs_.setSize(observerPositions_.size());
+            forAll(rawFilePtrs_, filei)
+            {
+                rawFilePtrs_.set
+                (
+                    filei,
+                    createFile("observer" + Foam::name(filei))
+                );
+
+                if (rawFilePtrs_.set(filei))
+                {
+                    OFstream& os = rawFilePtrs_[filei];
+
+                    writeHeaderValue(os, "Observer", filei);
+                    writeHeaderValue(os, "Position", observerPositions_[filei]);
+                    writeCommented(os, "Time");
+                    writeTabbed(os, "p(Curle)");
+                    os  << endl;
+                }
+            }
+            break;
+        }
+        case modeType::surface:
+        {
+            if (inputMode != modeType::surface)
+            {
+                FatalIOErrorInFunction(dict)
+                    << "Surface output is only available when input mode is "
+                    << "type '" << modeTypeNames_[modeType::surface] << "'"
+                    << abort(FatalIOError);
+            }
+
+            const word surfaceType(dict.get<word>("surfaceType"));
+            surfaceWriterPtr_ = surfaceWriter::New
+            (
+                surfaceType,
+                dict.subOrEmptyDict("formatOptions").subOrEmptyDict(surfaceType)
+            );
+
+            // Use outputDir/TIME/surface-name
+            surfaceWriterPtr_->useTimeDir() = true;
+        }
+    }
+
     // Read the reference speed of sound
     dict.readEntry("c0", c0_);
 
-        if (c0_.value() < VSMALL)
+    if (c0_ < VSMALL)
     {
         FatalErrorInFunction
             << "Reference speed of sound = " << c0_
@@ -148,29 +184,86 @@ bool Foam::functionObjects::Curle::read(const dictionary& dict)
             << abort(FatalError);
     }
 
-        // Set the location of the effective point source to the area-average
+    return true;
-        // of the patch face centres
+}
-        const volVectorField::Boundary& Cbf = mesh_.C().boundaryField();
+
-        const surfaceScalarField::Boundary& magSfBf =
+
-            mesh_.magSf().boundaryField();
+bool Foam::functionObjects::Curle::execute()
+{
+    if (!foundObject<volScalarField>(pName_))
+    {
+        return false;
+    }
+
+    const volScalarField& p = lookupObject<volScalarField>(pName_);
+    const volScalarField::Boundary& pBf = p.boundaryField();
+    const volScalarField dpdt(scopedName("dpdt"), fvc::ddt(p));
+    const volScalarField::Boundary& dpdtBf = dpdt.boundaryField();
+    const surfaceVectorField::Boundary& SfBf = mesh_.Sf().boundaryField();
+    const surfaceVectorField::Boundary& CfBf = mesh_.Cf().boundaryField();
+
+    scalarField pDash(observerPositions_.size(), 0);
 
-        x0_.value() = vector::zero;
-        scalar sumMagSf = 0;
     for (auto patchi : patchSet_)
     {
-            x0_.value() += sum(Cbf[patchi]*magSfBf[patchi]);
+        const scalarField& pp = pBf[patchi];
-            sumMagSf += sum(magSfBf[patchi]);
+        const scalarField& dpdtp = dpdtBf[patchi];
+        const vectorField& Sfp = SfBf[patchi];
+        const vectorField& Cfp = CfBf[patchi];
+
+        forAll(observerPositions_, pointi)
+        {
+            const vectorField r(Cfp - observerPositions_[pointi]);
+            const scalarField invMagR(1/(mag(r) + ROOTVSMALL));
+
+            pDash[pointi] +=
+                sum((pp*sqr(invMagR) + invMagR/c0_*dpdtp)*(Sfp & r));
         }
+    }
+    Pstream::listCombineGather(pDash, plusEqOp<scalar>());
+    Pstream::listCombineScatter(pDash);
 
-        reduce(x0_.value(), sumOp<vector>());
+    if (surfaceWriterPtr_)
-        reduce(sumMagSf, sumOp<scalar>());
+    {
+        if (Pstream::master())
+        {
+            // Time-aware, with time spliced into the output path
+            surfaceWriterPtr_->beginTime(time_);
 
-        x0_.value() /= sumMagSf + ROOTVSMALL;
+            surfaceWriterPtr_->open
+            (
+                inputSurface_.points(),
+                inputSurface_.surfFaces(),
+                (baseFileDir()/name()/"surface"),
+                false  // serial - already merged
+            );
+
+            surfaceWriterPtr_->write("p(Curle)", pDash);
+
+            surfaceWriterPtr_->endTime();
+            surfaceWriterPtr_->clear();
+        }
+    }
+    else
+    {
+        forAll(observerPositions_, pointi)
+        {
+            if (rawFilePtrs_.set(pointi))
+            {
+                OFstream& os = rawFilePtrs_[pointi];
+                writeCurrentTime(os);
+                os  << pDash[pointi] << endl;
+            }
+        }
+    }
 
     return true;
-    }
+}
 
-    return false;
+
+bool Foam::functionObjects::Curle::write()
+{
+    return true;
 }
 
 

src/functionObjects/field/Curle/Curle.H

@@ -35,15 +35,21 @@ Description
     Curle's analogy is implemented as:
 
     \f[
-        p' = \frac{1}{4 \pi c_0}\frac{\vec d}{|\vec d|^2}\cdot\frac{d\vec F}{dt}
+        p' = \frac{1}{4 \pi}
+             \frac{\vec{r}}{| \vec{r} | ^2} \cdot
+             \left(
+                \frac{\vec{F}}{| \vec{r} |}
+              + \frac{1}{c_0}\frac{d(\vec{F})}{d(t)}
+             \right)
     \f]
 
     where
     \vartable
-      p'        | Curle's acoustic pressure     [Pa] or [Pa \f$(m^3/\rho)\f$]
+        p'          | Curle's acoustic pressure [Pa] or [Pa (m3/kg)]
         c_0         | Reference speed of sound [m/s]
-      \vec d    | Distance vector to observer locations [m]
+        \vec{r}     | Distance vector to observer locations [m]
-      \vec F    | Force                         [N] or [N (\f$m^3/\rho\f$)]
+        \vec{F}     | Force [N] or [N (m3/kg)]
+        t           | time [s]
     \endvartable
 
     Operands:
@@ -62,16 +68,27 @@ Usage
     \verbatim
     Curle1
     {
-        // Mandatory entries (unmodifiable)
         type            Curle;
-        libs            (fieldFunctionObjects);
+        libs            ("libfieldFunctionObjects.so");
-
-        // Mandatory entries (runtime modifiable)
-        patches         (<patch1> <patch2> ... <patchN>)
-        c0              343;
-
-        // Optional (inherited) entries
         ...
+        patches         (surface1 surface2);
+        c0              330;
+
+
+        // Input - either points or surface
+
+        input           points;
+        observerPositions ((0 0 0)(1 0 0));
+
+        //input           surface;
+        //surface         "inputSurface.obj"
+
+
+        // Output - either points or surface
+        output          points;
+
+        //output          surface;
+        //surfaceType     ensight;
     }
     \endverbatim
 
@@ -80,8 +97,14 @@ Usage
       Property     | Description                        | Type | Req'd | Dflt
       type         | Type name: Curle                   | word |  yes  | -
       libs         | Library name: fieldFunctionObjects | word |  yes  | -
-      patches      | Names of the operand patches       | wordList | yes | -
+      p            | Pressure field name                | word |  no   | p
-      c0           | Reference speed of sound [m/s]     | scalar | yes | -
+      patches      | Sound generation patch names       | wordList | yes | -
+      c0           | Reference speed of sound           | scalar | yes | -
+      input        | Input type                         | word | yes   | -
+      observerPositions | List of observer positions (x y z) | pointList | no |-
+      surface      | Input surface file name            | word | no    | -
+      output       | Output type                        | word | yes   | -
+      surfaceType  | Output surface type                | word | no    | -
     \endtable
 
     The inherited entries are elaborated in:
@@ -93,7 +116,7 @@ Usage
 See also
     - Foam::functionObject
     - Foam::functionObjects::fvMeshFunctionObject
-    - Foam::functionObjects::fieldExpression
+    - Foam::functionObjects::writeFile
     - ExtendedCodeGuide::functionObjects::field::Curle
 
 SourceFiles
@@ -104,9 +127,11 @@ SourceFiles
 #ifndef functionObjects_Curle_H
 #define functionObjects_Curle_H
 
-#include "fieldExpression.H"
+#include "fvMeshFunctionObject.H"
-#include "dimensionedScalar.H"
+#include "writeFile.H"
-#include "dimensionedVector.H"
+#include "Enum.H"
+#include "MeshedSurface.H"
+#include "surfaceWriter.H"
 
 // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
@@ -121,26 +146,40 @@ namespace functionObjects
 
 class Curle
 :
-    public fieldExpression
+    public fvMeshFunctionObject,
+    public writeFile
 {
+    enum class modeType
+    {
+        point,
+        surface
+    };
+
+    static const Enum<modeType> modeTypeNames_;
+
+
     // Private Data
 
-        // Read from dictionary
+        //- Name of pressure field; default = p
+        word pName_;
 
         //- Patches to integrate forces over
         labelHashSet patchSet_;
 
-            //- Area-averaged centre of patch faces
+        //- Observer positions
-            dimensionedVector x0_;
+        List<point> observerPositions_;
 
         //- Reference speed of sound
-            dimensionedScalar c0_;
+        scalar c0_;
 
+        //- Output files when sampling points
+        PtrList<OFstream> rawFilePtrs_;
 
-protected:
+        //- Input surface when sampling a surface
+        MeshedSurface<face> inputSurface_;
 
-        //- Calculate the acoustic pressure field and return true if successful
+        //- Ouput surface when sampling a surface
-        virtual bool calc();
+        autoPtr<surfaceWriter> surfaceWriterPtr_;
 
 
 public:
@@ -174,6 +213,10 @@ public:
 
         //- Read the Curle data
         virtual bool read(const dictionary&);
+
+        virtual bool execute();
+
+        virtual bool write();
 };
 
 

src/randomProcesses/noise/noiseModels/surfaceNoise/surfaceNoise.C

@@ -104,7 +104,8 @@ void surfaceNoise::initialise(const fileName& fName)
         deltaT_ = checkUniformTimeStep(times_);
 
         // Read the surface geometry
-        const meshedSurface& surf = readerPtr_->geometry();
+        // Note: hard-coded to read mesh from first time index
+        const meshedSurface& surf = readerPtr_->geometry(0);
         nFace_ = surf.size();
     }
 
@@ -208,7 +209,6 @@ void surfaceNoise::readSurfaceData
 
             Info<< "    time: " << times_[i] << endl;
             const scalarField p(readerPtr_->field(timeI, pIndex_, scalar(0)));
-
             forAll(p, faceI)
             {
                 pData[faceI][i] = p[faceI]*rhoRef_;
@@ -256,7 +256,8 @@ Foam::scalar surfaceNoise::writeSurfaceData
         scalar areaAverage = 0;
         if (Pstream::master())
         {
-            const meshedSurface& surf = readerPtr_->geometry();
+            // Note: hard-coded to read mesh from first time index
+            const meshedSurface& surf = readerPtr_->geometry(0);
 
             scalarField allData(surf.size());
 
@@ -298,7 +299,7 @@ Foam::scalar surfaceNoise::writeSurfaceData
 
             // TO BE VERIFIED: area-averaged values
             // areaAverage = sum(allData*surf.magSf())/sum(surf.magSf());
-            areaAverage = sum(allData)/allData.size();
+            areaAverage = sum(allData)/(allData.size() + ROOTVSMALL);
         }
         Pstream::scatter(areaAverage);
 
@@ -306,7 +307,8 @@ Foam::scalar surfaceNoise::writeSurfaceData
     }
     else
     {
-        const meshedSurface& surf = readerPtr_->geometry();
+        // Note: hard-coded to read mesh from first time index
+        const meshedSurface& surf = readerPtr_->geometry(0);
 
         if (writeSurface)
         {
@@ -329,7 +331,7 @@ Foam::scalar surfaceNoise::writeSurfaceData
 
         // TO BE VERIFIED: area-averaged values
         // return sum(data*surf.magSf())/sum(surf.magSf());
-        return sum(data)/data.size();
+        return sum(data)/(data.size() + ROOTVSMALL);
     }
 }
 
@@ -357,7 +359,8 @@ Foam::scalar surfaceNoise::surfaceAverage
         scalar areaAverage = 0;
         if (Pstream::master())
         {
-            const meshedSurface& surf = readerPtr_->geometry();
+            // Note: hard-coded to read mesh from first time index
+            const meshedSurface& surf = readerPtr_->geometry(0);
 
             scalarField allData(surf.size());
 

src/sampling/sampledSurface/readers/ensight/ensightSurfaceReader.C

@@ -123,6 +123,25 @@ void Foam::ensightSurfaceReader::debugSection
 }
 
 
+Foam::fileName Foam::ensightSurfaceReader::replaceMask
+(
+    const fileName& fName,
+    const label timeIndex
+) const
+{
+    fileName result(fName);
+    std::ostringstream oss;
+
+    label nMask = stringOps::count(fName, '*');
+    const std::string maskStr(nMask, '*');
+    oss << std::setfill('0') << std::setw(nMask) << timeIndex;
+    const word indexStr = oss.str();
+    result.replace(maskStr, indexStr);
+
+    return result;
+}
+
+
 Foam::Pair<Foam::ensightSurfaceReader::idTypes>
 Foam::ensightSurfaceReader::readGeometryHeader(ensightReadFile& is) const
 {
@@ -230,6 +249,8 @@ void Foam::ensightSurfaceReader::readCase(IFstream& is)
     // - use the last entry
     meshFileName_ = stringOps::splitSpace(buffer).last().str();
 
+    DebugInfo << "mesh file:" << meshFileName_ << endl;
+
     debugSection("VARIABLE", is);
 
     // Read the field description
@@ -330,13 +351,17 @@ Foam::ensightSurfaceReader::ensightSurfaceReader(const fileName& fName)
 
 // * * * * * * * * * * * * * Public Member Functions   * * * * * * * * * * * //
 
-const Foam::meshedSurface& Foam::ensightSurfaceReader::geometry()
+const Foam::meshedSurface& Foam::ensightSurfaceReader::geometry
+(
+    const label timeIndex
+)
 {
     DebugInFunction << endl;
 
     if (!surfPtr_.valid())
     {
-        IFstream isBinary(baseDir_/meshFileName_, IOstream::BINARY);
+        fileName meshInstance(replaceMask(meshFileName_, timeIndex));
+        IFstream isBinary(baseDir_/meshInstance, IOstream::BINARY);
 
         if (!isBinary.good())
         {
@@ -391,7 +416,7 @@ const Foam::meshedSurface& Foam::ensightSurfaceReader::geometry()
         }
 
 
-        ensightReadFile is(baseDir_/meshFileName_, streamFormat_);
+        ensightReadFile is(baseDir_/meshInstance, streamFormat_);
 
         DebugInfo
             << "File: " << is.name() << nl;

src/sampling/sampledSurface/readers/ensight/ensightSurfaceReader.H

@@ -5,7 +5,7 @@
     \\  /    A nd           | www.openfoam.com
      \\/     M anipulation  |
 -------------------------------------------------------------------------------
-    Copyright (C) 2015-2019 OpenCFD Ltd.
+    Copyright (C) 2015-2020 OpenCFD Ltd.
 -------------------------------------------------------------------------------
 License
     This file is part of OpenFOAM.
@@ -112,6 +112,13 @@ protected:
         //- Read and check a section header
         void debugSection(const word& expected, IFstream& is) const;
 
+        //- Replace the mask with an 0 padded string
+        fileName replaceMask
+        (
+            const fileName& fName,
+            const label timeIndex
+        ) const;
+
         //- Read (and discard) geometry file header.
         //  \return information about node/element id handling
         Pair<idTypes> readGeometryHeader(ensightReadFile& is) const;
@@ -164,7 +171,7 @@ public:
     // Member Functions
 
         //- Return a reference to the surface geometry
-        virtual const meshedSurface& geometry();
+        virtual const meshedSurface& geometry(const label timeIndex);
 
         //- Return a list of the available times
         virtual instantList times() const;

src/sampling/sampledSurface/readers/ensight/ensightSurfaceReaderTemplates.C

@@ -70,24 +70,7 @@ Foam::tmp<Foam::Field<Type>> Foam::ensightSurfaceReader::readField
     const word& fieldName(fieldNames_[fieldIndex]);
     const label fileIndex = timeStartIndex_ + timeIndex*timeIncrement_;
 
-    fileName fieldFileName(fieldFileNames_[fieldIndex]);
+    fileName fieldFileName(replaceMask(fieldFileNames_[fieldIndex], fileIndex));
-
-    std::ostringstream oss;
-    label nMask = 0;
-    for (size_t chari = 0; chari < fieldFileName.size(); ++chari)
-    {
-        if (fieldFileName[chari] == '*')
-        {
-            nMask++;
-        }
-    }
-
-    const std::string maskStr(nMask, '*');
-    oss << std::setfill('0') << std::setw(nMask) << fileIndex;
-    const word indexStr = oss.str();
-    fieldFileName.replace(maskStr, indexStr);
-
-
     ensightReadFile is(baseDir_/fieldFileName, streamFormat_);
 
     if (!is.good())

src/sampling/sampledSurface/readers/surfaceReader.H

@@ -101,7 +101,7 @@ public:
     // Member Functions
 
         //- Return a reference to the surface geometry
-        virtual const meshedSurface& geometry() = 0;
+        virtual const meshedSurface& geometry(const label timeIndex) = 0;
 
         //- Return a list of the available times
         virtual instantList times() const = 0;

tutorials/incompressible/pimpleFoam/LES/vortexShed/0.orig/U

@@ -16,19 +16,20 @@ FoamFile
 
 dimensions      [0 1 -1 0 0 0 0];
 
-internalField   uniform (40 0 0);
+internalField   uniform (0.025 0 0);
 
 boundaryField
 {
     cylinder
     {
-        type            noSlip;
+        type            fixedValue;
+        value           uniform (0 0 0);
     }
 
     inlet
     {
         type            fixedValue;
-        value           $internalField;
+        value           uniform (0.025 0 0);
     }
 
     outlet
@@ -38,10 +39,14 @@ boundaryField
         inletValue      uniform (0 0 0);
     }
 
-    "top|bottom"
+    "(top|bottom)"
     {
-        type            pressureInletOutletVelocity;
+        type            slip;
-        value           uniform (0 0 0);
+    }
+
+    frontAndBack
+    {
+        type            empty;
     }
 }
 

tutorials/incompressible/pimpleFoam/LES/vortexShed/0.orig/nuTilda

@@ -17,7 +17,7 @@ FoamFile
 
 dimensions      [0 2 -1 0 0 0 0];
 
-internalField   uniform 1.51e-05;
+internalField   uniform 1e-05;
 
 boundaryField
 {
@@ -33,12 +33,22 @@ boundaryField
         value           $internalField;
     }
 
-    "outlet|top|bottom"
+    outlet
     {
         type            inletOutlet;
         inletValue      $internalField;
         value           $internalField;
     }
+
+    "(top|bottom)"
+    {
+        type            zeroGradient;
+    }
+
+    frontAndBack
+    {
+        type            empty;
+    }
 }
 
 

tutorials/incompressible/pimpleFoam/LES/vortexShed/0.orig/nut

@@ -33,11 +33,16 @@ boundaryField
         value           $internalField;
     }
 
-    "outlet|top|bottom"
+    "(outlet|top|bottom)"
     {
         type            calculated;
         value           $internalField;
     }
+
+    frontAndBack
+    {
+        type            empty;
+    }
 }
 
 

tutorials/incompressible/pimpleFoam/LES/vortexShed/0.orig/p

@@ -30,15 +30,25 @@ boundaryField
         type            zeroGradient;
     }
 
-    "outlet|top|bottom"
+    outlet
     {
-        type            totalPressure;
+        type            fixedValue; // totalPressure;
         rho             none;
         psi             none;
         p0              $internalField;
         gamma           1;
         value           $internalField;
     }
+
+    "(top|bottom)"
+    {
+        type            zeroGradient;
+    }
+
+    frontAndBack
+    {
+        type            empty;
+    }
 }
 
 

tutorials/incompressible/pimpleFoam/LES/vortexShed/README

@@ -1,3 +1,15 @@
-- Acoustic pressure is calculated based on Curle's analogy.
+Summary
-- Such field is sampled for point (probe) and surface (cutting plane)
+- Vortex street generated from flow over a sphere
-- noise utility is operated onto these samples to obtain frequency information
+- Acoustic pressure is calculated based on Curle's analogy
+- noise utility is processes the acoustic pressure to obtain frequency information
+
+Case detailis
+- cylinder diameter: 0.04
+- flow speed: 0.025
+- kinematic viscosity: 1e-5
+- Reynolds number based on cylinder diameter, Red = 100
+- For this Red, St = 0.198(1 - 0.197/Red) = 0.159
+- Shedding fequency, f = St*U/d = 0.1 Hz
+
+Plotting the FFT of the pressure field shoud show a peak at the shedding
+frequency

tutorials/incompressible/pimpleFoam/LES/vortexShed/constant/transportProperties

@@ -17,6 +17,6 @@ FoamFile
 
 transportModel  Newtonian;
 
-nu              2e-05;
+nu              1e-05;
 
 // ************************************************************************* //

tutorials/incompressible/pimpleFoam/LES/vortexShed/system/controlDict

@@ -23,15 +23,15 @@ startTime       0;
 
 stopAt          endTime;
 
-endTime         0.2;
+endTime         200;
 
-deltaT          1e-5;
+deltaT          1e-2;
 
 writeControl    timeStep;
 
-writeInterval   100; // every 0.001s
+writeInterval   100; // every 1s
 
-purgeWrite      200;
+purgeWrite      50;
 
 writeFormat     binary;
 
@@ -55,35 +55,70 @@ functions
         fields          (U p);
     }
 
-    curle
+    curleSurface
     {
         // Mandatory entries
         type            Curle;
         libs            (fieldFunctionObjects);
         patches         (cylinder);
         c0              343;
+        input           surface;
+        surface         surface.obj;
+        output          surface;
+        surfaceType     ensight;
+        formatOptions
+        {
+            ensight
+            {
+                format ascii; // needed for surfaceNoise ...
+                collateTimes true;
+            }
+        }
 
         // Optional (inherited) entries
-        field           p;
+        p               p;
-        result          Curle;
         region          region0;
         enabled         true;
         log             true;
-        timeStart       0.1;
+        timeStart       100;
+        timeEnd         1000;
+        executeControl  timeStep;
+        executeInterval 1;
+    }
+    curlePoint
+    {
+        // Mandatory entries
+        type            Curle;
+        libs            (fieldFunctionObjects);
+        patches         (cylinder);
+        c0              343;
+        input           point;
+        output          point;
+        observerPositions
+        (
+            (0.20 0.17 -0.01) // N
+            (0.22 0.15 -0.01) // E
+            (0.20 0.13 -0.01) // S
+            (0.18 0.15 -0.01) // W
+        );
+
+        // Optional (inherited) entries
+        p               p;
+        region          region0;
+        enabled         true;
+        log             true;
+        timeStart       100;
         timeEnd         1000;
         executeControl  timeStep;
         executeInterval 1;
-        writeControl    writeTime;
-        writeInterval   -1;
     }
 
     cuttingPlane
     {
         type            surfaces;
         libs            (sampling);
-        writeControl    timeStep;
+        writeControl    writeTime;
-        writeInterval   2;
+        timeStart       100;
-        timeStart       0.1;
 
         surfaceFormat   ensight;
         formatOptions
@@ -94,7 +129,7 @@ functions
                 collateTimes    true;
             }
         }
-        fields          (p Curle);
+        fields          (p U);
 
         interpolationScheme cellPoint;
 
@@ -119,32 +154,14 @@ functions
         type            forces;
         libs            (forces);
         writeControl    writeTime;
-        timeStart       0.1;
+        timeStart       100;
 
         patches         (cylinder);
         CofR            (0.20 0.15 -0.01);
         writeFields     yes;
 
         rho             rhoInf;
-        rhoInf          1.205;
+        rhoInf          1;
-    }
-
-    probes
-    {
-        type            patchProbes;
-        libs            (sampling);
-        writeControl    timeStep;
-        timeStart       0.1;
-
-        patch           cylinder;
-        probeLocations
-        (
-            (0.20 0.17 -0.01) // N
-            (0.22 0.15 -0.01) // E
-            (0.20 0.13 -0.01) // S
-            (0.18 0.15 -0.01) // W
-        );
-        fields          (p forces:force Curle);
     }
 }
 

tutorials/incompressible/pimpleFoam/LES/vortexShed/system/fvSolution

@@ -17,13 +17,10 @@ FoamFile
 
 solvers
 {
-
     p
     {
         solver          GAMG;
         smoother        DICGaussSeidel;
-//        solver          PCG;
-//        preconditioner  DIC;
         tolerance       1e-20;
         relTol          0.05;
     }
@@ -37,10 +34,10 @@ solvers
 
     "(U|nuTilda)"
     {
-//        solver           PBiCGStab;
+        //solver          smoothSolver;
-//        preconditioner   DILU;
+        //smoother        symGaussSeidel;
-        solver          smoothSolver;
+        solver          PBiCGStab;
-        smoother        symGaussSeidel;
+        preconditioner  DILU;
         tolerance       0;
         relTol          0.1;
     }
@@ -64,9 +61,9 @@ PIMPLE
 
 relaxationFactors
 {
-    nuTilda         0.95;
+    nuTilda         0.8;
-    U               0.95;
+    U               0.8;
-    p               0.95;
+    p               0.8;
     ".*Final"        1.0;
 }
 

tutorials/incompressible/pimpleFoam/LES/vortexShed/system/noiseDict-point

@@ -34,8 +34,10 @@ pointNoiseCoeffs
 
     files
     (
-        "postProcessing/probes/0/p"
+        "postProcessing/curlePoint/0/observer0.dat"
-        "postProcessing/probes/0.1/Curle"
+        "postProcessing/curlePoint/0/observer1.dat"
+        "postProcessing/curlePoint/0/observer2.dat"
+        "postProcessing/curlePoint/0/observer3.dat"
     );
 
     nHeaderLine     6;
@@ -48,7 +50,7 @@ pointNoiseCoeffs
     // default = 2^16 (=65536)
     N               4096;
 
-    rhoRef          1.205;
+    rhoRef          1;
 }
 
 

tutorials/incompressible/pimpleFoam/LES/vortexShed/system/noiseDict-surface

@@ -34,7 +34,7 @@ surfaceNoiseCoeffs
 
 
     // Input file
-    file        "postProcessing/cuttingPlane/zNormal/zNormal.case";
+    file        "postProcessing/curleSurface/surface/surface.case";
 
     // Surface reader
     reader      ensight;
@@ -53,13 +53,13 @@ surfaceNoiseCoeffs
     }
 
     // Pressure field
-    p               Curle;
+    p               pCurle;
 
     // Number of samples in sampling window
     // default = 2^16 (=65536)
-    N               1024;
+    N               4096;
 
-    rhoRef          1.205;
+    rhoRef          1;
 }