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Old   April 2, 2013, 04:41
Default Add time-dependent force
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Hello everyone,
I'm a new OpenFoam user.
I need to add into the Navier-Stokes equations the time-dependent force: f(t) = F*cos(w*t)^2, where t - time.

Here is the UEqn.H:
fvVectorMatrix UEqn
        fvm::ddt(rho, U)
      + fvm::div(rhoPhi, U)
      + turbulence->divDevRhoReff(rho, U)


    if (pimple.momentumPredictor())
           (rho*F) - fvc::reconstruct
                  - ghf*fvc::snGrad(rho)
                  - fvc::snGrad(p_rgh)
                ) * mesh.magSf()
Info<< "Reading field F\n" << endl;
volVectorField F
It's work for f=F without t, but I don't know how write t and F*cos(w*t)^2.
Could you tell me how to do it.
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