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Forum: OpenFOAM Programming & Development

August 3, 2020, 15:35

Replies: 4

time derivative of laplacian

Views: 995

Posted By nikitin-pro

I did.. same error. a somewhat solution is that...

I did.. same error.
a somewhat solution is that
c * fvc::laplacian(a,fvc::ddt(T)) or c * fvc::ddt(volScalarField("lap",fvc::laplacian(a,T)))

Both compile ok and simulation runs well, but this...

Forum: OpenFOAM Programming & Development

August 2, 2020, 16:22

Replies: 4

time derivative of laplacian

Views: 995

Posted By nikitin-pro

Interesting thing:compiles OK: volScalarField...

Interesting thing:compiles OK:
volScalarField lap(c * fvc::laplacian(a,T));
fvScalarMatrix TEqn (fvm::ddt(T) - fvm::ddt(lap) - fvm::laplacian(a,T) == 0);
but solution fails with the following...

Forum: OpenFOAM Programming & Development

August 2, 2020, 04:46

Replies: 4

time derivative of laplacian

Views: 995

Posted By nikitin-pro

time derivative of laplacian

I have a function I can't implement:
\frac{\partial(c\alpha\Delta T)}{\partial t}

a -- is a constant in [m2/s], which I defined via external dictionary (lookup)
c -- is a constant in [s], which...

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