|October 4, 2013, 08:00||
Diffusion term in OpenFOAM
Join Date: Oct 2010
Posts: 6Rep Power: 6
checking the term turbulence->divDevReff(U) I came up with the following question:
The diffusion term for incompressible flows should look somehow like this (here, I ignored the viscosity):
fvc::div(fvc::grad(U)+fvc::grad(U)().T())And this can be transformed to this:
fvc::laplacian(U)But when I implement that into OpenFOAM, those terms give different results. I assume it is connected to the discretization schemes, but even when I use linear for all schemes, it gives me different results.
So, what do I do wrong? What do I miss? Is it because of wall-functions or boundary conditions?
Any comment is appreciated...
|February 12, 2014, 10:23||
Join Date: Sep 2010
Posts: 289Rep Power: 9
I think this wiki page might explain what is going on here:
Also have a look at this thread (the difference between compressible and incompressible models goes away if the continuity equation is fulfilled after convergence of the solution):
|February 12, 2014, 10:43||
Join Date: Sep 2009
Posts: 790Rep Power: 12
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