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Time-Dependent Boundary Conditions in OpenFOAM
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Time-Dependent Boundary Conditions in OpenFOAM
1.
#ifndef rotatingWallVelocityFvPatchVectorField_H #define rotatingWallVelocityFvPatchVectorField_H #include
"fixedValueFvPatchFields.H" #include "DataEntry.H" // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * // namespace Foam { /*---------------------------------------------------------------------------*¥ Class rotatingWallVelocityFvPatchVectorField Declaration ¥*---------------------------------------------------------------------------*/ class rotatingWallVelocityFvPatchVectorField : public fixedValueFvPatchVectorField { // Private data //- Origin of the rotation vector origin_; //- Axis of the rotation vector axis_; //- Rotational speed autoPtr<DataEntry<scalar> > omega_; public: In header file (.H) • Including “DataEntry.H” file • Defining time-varying parameter In source file (.C) • Reading the parameter • Calculating the parameter value // * * * * * * * * * * * * * * * * Constructors * * * * * * * * * * * * * * // Foam::rotatingWallVelocityFvPatchVectorField:: rotatingWallVelocityFvPatchVectorField ( const fvPatch& p, const DimensionedField<vector, volMesh>& iF, const dictionary& dict ) : fixedValueFvPatchField<vector>(p, iF), origin_(dict.lookup("origin")), axis_(dict.lookup("axis")), omega_(DataEntry<scalar>::New("omega", dict)) { if (dict.found("value")) { fvPatchField<vector>::operator= ( vectorField("value", dict, p.size()) ); } else { // Evaluate the wall velocity updateCoeffs(); } } // * * * * * * * * * * * * * * * Member Functions * * * * * * * * * * * * * // void Foam::rotatingWallVelocityFvPatchVectorField::updateCoeffs() { if (updated()) { return; } const scalar t = this->db().time().timeOutputValue(); scalar om = omega_->value(t); // Calculate the rotating wall velocity from the specification of the motion const vectorField Up ( (-om)*((patch().Cf() - origin_) ^ (axis_/mag(axis_))) ); // Remove the component of Up normal to the wall // just in case it is not exactly circular const vectorField n(patch().nf()); vectorField::operator=(Up - n*(n & Up)); fixedValueFvPatchVectorField::updateCoeffs(); } Time-Dependent BCs in OpenFOAM BCs with time-varying options Source Code (rotatingWallVelocity) Ref.: Release Note Version 2.1.0 uniformFixedValue General fixed value condition with time- varying value (uniformValue) rotatingWallVelocity Velocity condition for a rotating boundary with time-varying angular velocity [rad/s] (omega) flowRateInletVelocity Inlet velocity condition with time-varying flow-rate (volumetricFlowRate or massFlowRate) a good many others Examples of BC Specification inlet { type uniformFixedValue; uniformValue table ( (0 (10 0 0)) (0.1 (12 0 0)) (0.2 (12 0 0)) (0.3 (11 0 0)) ); } Ux [m/s] Time [s] rotatingWallVelocityFvPatchVectorField.H rotatingWallVelocityFvPatchVectorField.C 1 2 1 2 3 4 3 4
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