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ENH: Pressure function object - added optional inclusion of hydrostatic pressure
Example - create p-rgh from p:
pressure-p-rgh
{
type pressure;
libs (fieldFunctionObjects);
writeControl writeTime;
mode static;
rho rhoInf;
rhoInf 1;
hydrostaticMode subtract;
g (0 -9.81 0);
hRef 0;
}
- the hydrostaticMode entry is optional - setting is shown during construction
- g and/or hRef values are retrieved from the database if not specified
This commit is contained in:
Andrew Heather
@ -29,6 +29,7 @@ License
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#include "pressure.H"
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#include "volFields.H"
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#include "basicThermo.H"
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#include "uniformDimensionedFields.H"
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#include "addToRunTimeSelectionTable.H"
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// * * * * * * * * * * * * * * Static Data Members * * * * * * * * * * * * * //
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@ -55,6 +56,17 @@ Foam::functionObjects::pressure::modeNames
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{ TOTAL_COEFF, "totalCoeff" },
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});
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const Foam::Enum
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<
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Foam::functionObjects::pressure::hydrostaticMode
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>
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Foam::functionObjects::pressure::hydrostaticModeNames
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({
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{ NONE, "none" },
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{ ADD, "add" },
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{ SUBTRACT, "subtract" },
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});
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// * * * * * * * * * * * * * Private Member Functions * * * * * * * * * * * //
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Foam::word Foam::functionObjects::pressure::resultName() const
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@ -80,6 +92,26 @@ Foam::word Foam::functionObjects::pressure::resultName() const
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<< abort(FatalError);
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}
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switch (hydrostaticMode_)
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{
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case NONE:
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{
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break;
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}
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case ADD:
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{
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rName = rName + "+rgh";
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break;
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}
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case SUBTRACT:
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{
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rName = rName + "-rgh";
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break;
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}
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}
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if (mode_ & COEFF)
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{
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rName += "_coeff";
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@ -141,18 +173,90 @@ Foam::tmp<Foam::volScalarField> Foam::functionObjects::pressure::rhoScale
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}
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void Foam::functionObjects::pressure::addHydrostaticContribution
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(
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volScalarField& p
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) const
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{
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// Add/subtract hydrostatic contribution
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if (hydrostaticMode_ == NONE)
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{
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return;
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}
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if (!gInitialised_)
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{
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g_ = mesh_.time().lookupObject<uniformDimensionedVectorField>("g");
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}
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if (!hRefInitialised_)
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{
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hRef_ = mesh_.lookupObject<uniformDimensionedScalarField>("hRef");
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}
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const dimensionedScalar ghRef
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(
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(g_ & (cmptMag(g_.value())/mag(g_.value())))*hRef_
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);
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tmp<volScalarField> rgh = rhoScale(p, (g_ & mesh_.C()) - ghRef);
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switch (hydrostaticMode_)
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{
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case ADD:
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{
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p += rgh;
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break;
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}
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case SUBTRACT:
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{
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p -= rgh;
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break;
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}
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default:
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{}
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}
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}
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Foam::tmp<Foam::volScalarField> Foam::functionObjects::pressure::calcPressure
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(
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const volScalarField& p,
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const tmp<volScalarField>& tp
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) const
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{
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// Initialise to the pressure reference level
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auto tresult =
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tmp<volScalarField>::New
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(
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IOobject
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(
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name() + ":p",
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mesh_.time().timeName(),
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mesh_,
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IOobject::NO_READ
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),
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mesh_,
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dimensionedScalar("p", dimPressure, pRef_)
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);
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volScalarField& result = tresult.ref();
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addHydrostaticContribution(result);
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if (mode_ & STATIC)
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{
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result += tp;
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return tresult;
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}
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if (mode_ & TOTAL)
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{
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return
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result +=
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tp
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+ dimensionedScalar("pRef", dimPressure, pRef_)
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+ rhoScale(p, 0.5*magSqr(lookupObject<volVectorField>(UName_)));
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return tresult;
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}
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if (mode_ & ISENTROPIC)
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@ -175,10 +279,12 @@ Foam::tmp<Foam::volScalarField> Foam::functionObjects::pressure::calcPressure
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/sqrt(gamma*tp.ref()/thermoPtr->rho())
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);
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return tp()*(pow(1 + (gamma - 1)/2*sqr(Mb), gamma/(gamma - 1)));
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result += tp*(pow(1 + (gamma - 1)/2*sqr(Mb), gamma/(gamma - 1)));
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return tresult;
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}
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return tp + dimensionedScalar("pRef", dimPressure, pRef_);
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return tresult;
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}
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@ -246,13 +352,18 @@ Foam::functionObjects::pressure::pressure
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:
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fieldExpression(name, runTime, dict, "p"),
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mode_(STATIC),
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hydrostaticMode_(NONE),
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UName_("U"),
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rhoName_("rho"),
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pRef_(0),
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pInf_(0),
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UInf_(Zero),
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rhoInf_(1),
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rhoInfInitialised_(false)
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rhoInfInitialised_(false),
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g_(dimAcceleration),
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gInitialised_(false),
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hRef_(dimLength),
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hRefInitialised_(false)
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{
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read(dict);
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}
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@ -300,10 +411,34 @@ bool Foam::functionObjects::pressure::read(const dictionary& dict)
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}
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}
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Info<< " operating mode: " << modeNames[mode_] << nl;
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Info<< " Operating mode: " << modeNames[mode_] << nl;
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pRef_ = dict.lookupOrDefault<scalar>("pRef", 0);
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if
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(
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hydrostaticModeNames.readIfPresent
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(
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"hydrostaticMode",
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dict,
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hydrostaticMode_
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)
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&& hydrostaticMode_
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)
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{
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Info<< " Hydrostatic mode: "
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<< hydrostaticModeNames[hydrostaticMode_]
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<< nl;
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gInitialised_ = dict.readIfPresent("g", g_);
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hRefInitialised_ = dict.readIfPresent("hRef", hRef_);
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}
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else
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{
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Info<< " Not including hydrostatic effects" << nl;
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}
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if (mode_ & COEFF)
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{
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dict.readEntry("pInf", pInf_);
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@ -100,6 +100,7 @@ Usage
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pInf | Freestream pressure for coefficient calculation | no |
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UInf | Freestream velocity for coefficient calculation | no |
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rhoInf | Freestream density for coefficient calculation | no |
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hydrostaticMode | Hydrostatic contributions (see below) | no | none
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\endtable
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The \c mode entry is used to select the type of pressure that is calculated.
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@ -110,6 +111,13 @@ Usage
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- staticCoeff
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- totalCoeff
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The optional \c hydrostaticMode entry provides handling for the term
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\f$ \rho (\vec{g} \dot \vec{h})\f$ where options include
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- \c none : not included
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- \c add : add the term, e.g. to convert from p_rgh to p
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- \c subtract : subtract the term, e.g. to convert from p to p_rgh
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See also
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Foam::functionObjects::fieldExpression
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Foam::functionObjects::fvMeshFunctionObject
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@ -124,6 +132,7 @@ SourceFiles
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#include "fieldExpression.H"
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#include "volFieldsFwd.H"
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#include "dimensionedVector.H"
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#include "dimensionedScalar.H"
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// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
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@ -148,16 +157,26 @@ public:
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//- Enumeration for pressure calculation mode
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enum mode : unsigned
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{
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STATIC = 0x1, //!< Static pressure
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TOTAL = 0x2, //!< Total pressure
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ISENTROPIC = 0x4, //!< Isentropic pressure
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COEFF = 0x8, //!< Coefficient manipulator
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STATIC = (1 << 0), //!< Static pressure
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TOTAL = (1 << 1), //!< Total pressure
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ISENTROPIC = (1 << 2), //!< Isentropic pressure
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COEFF = (1 << 3), //!< Coefficient manipulator
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STATIC_COEFF = (STATIC | COEFF),
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TOTAL_COEFF = (TOTAL | COEFF)
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TOTAL_COEFF = (TOTAL | COEFF),
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};
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static const Enum<mode> modeNames;
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//- Enumeration for hydrostatic contributions
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enum hydrostaticMode : unsigned
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{
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NONE = 0,
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ADD,
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SUBTRACT
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};
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static const Enum<hydrostaticMode> hydrostaticModeNames;
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private:
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@ -166,6 +185,9 @@ private:
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//- Calculation mode
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mode mode_;
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//- Hydrostatic constribution mode
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hydrostaticMode hydrostaticMode_;
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//- Name of velocity field, default is "U"
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word UName_;
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@ -194,6 +216,21 @@ private:
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bool rhoInfInitialised_;
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//- p +/- rgh calculation
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//- Gravity vector
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mutable dimensionedVector g_;
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//- Flag to show whether g has been initialised
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bool gInitialised_;
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//- Reference height
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mutable dimensionedScalar hRef_;
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//- Flag to show whether hRef has been initialised
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bool hRefInitialised_;
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// Private Member Functions
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//- Return the name of the derived pressure field
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@ -209,8 +246,8 @@ private:
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const tmp<volScalarField>& tsf
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) const;
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//- Return the reference pressure
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tmp<volScalarField> pRef(const tmp<volScalarField>& tp) const;
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//- Add the hydrostatic contribution
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void addHydrostaticContribution(volScalarField& p) const;
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//- Calculate and return the pressure
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tmp<volScalarField> calcPressure
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