69 lines
1.7 KiB
C
69 lines
1.7 KiB
C
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if(Pstream::master())
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{
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// const scalarField& magSf =
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// mesh.magSf().boundaryField()[interface.aPatchID()];
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// vectorField n =
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// mesh.Sf().boundaryField()[interface.aPatchID()]/magSf;
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// const scalarField& P = p.boundaryField()[interface.aPatchID()];
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// vectorField pressureForces = magSf*P*n;
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// vectorField snGradU =
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// U.boundaryField()[interface.aPatchID()].snGrad();
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// vectorField viscousForces =
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// - interface.muFluidA().value()*magSf*
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// (
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// snGradU
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// + ((n*n)&snGradU)
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// + (fac::grad(interface.Us())&interface.aMesh().faceAreaNormals())
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// ().internalField()
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// );
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vector totalPressureForce = -interface.totalPressureForce();
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vector totalViscousForce = -interface.totalViscousForce();
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vector totalForce = totalPressureForce + totalViscousForce;
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vector dragDir;
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scalar Uref;
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if(mag(UF.value()) > SMALL)
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{
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dragDir = - UF.value()/mag(UF.value());
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Uref = mag(UF.value());
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}
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else
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{
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dragDir = interface.g().value()/mag(interface.g().value());
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Uref = SMALL;
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}
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scalar Aref =
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sum
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(
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(dragDir&mesh.Sf().boundaryField()[interface.aPatchID()])*
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pos(dragDir&mesh.Sf().boundaryField()[interface.aPatchID()])
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);
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scalar drag =
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(dragDir&totalForce)/
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(0.5*interface.rhoFluidA().value()*sqr(Uref)*Aref);
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scalar lift =
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mag((I - dragDir*dragDir)&totalForce)/
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(0.5*interface.rhoFluidA().value()*sqr(Uref)*Aref);
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forcesFile << runTime.value() << tab;
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forcesFile << drag << tab << lift << endl;
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}
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