Moving workpiece instead of Heat source Problem
Hi
I'm facing a strange problem...I'm solving the equation below dT/dt  v* dT/dx  (k/rho*Cp) (d2T/dx2+d2T/dy2+d2T/dz2) =0 v= welding speed My intention is to instead of moving the heat source I want to move the work piece itself. In OpenFOAM, I have modelled the equation like this: TEqn.H { volVectorField gradT = fvc::grad(T); volScalarField dtdx = gradT.component(0); solve ( fvm::ddt(T)  fvm::laplacian(DT, T)  VX*dtdx ) } For declaration of VX I have tried following both ways: 1. dimensionedScalarField 2. volVectorField and then taking X component of the velocity (VX) But the problem is that, solution is acting like a fixed heat source...it's not moving.... Anyone can give me idea to work out this .....Thnx in advance 
Why are you multiplying the dT/dx term by a field? Does the welding speed vary with location? It seems that a dimensionedScalar would work if the welding speed in constant across the entire system (though not necessarily constant in time).

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