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Spalart-Allmaras and "Non-Conservative Diffusion" |
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April 15, 2013, 18:22 |
Spalart-Allmaras and "Non-Conservative Diffusion"
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Peter Doings
Join Date: Sep 2012
Location: Portugal
Posts: 4
Rep Power: 13 |
Hello.
I'm an undergrad student and I'm implementing the S-A model for incompressible flow in a FV solver; I have access to STAR-CCM+'s documentation and there I found an entry explaining that they did not discretize explicitly one of parcels of the diffusion term but that they combined it with the conservative diffusion one. I tried to get to the formula on my own using the identity: And got a very similar result to STAR's: Except that in the documentation it appears as a and the last term has, instead of the Laplacian, a which I assume is their mistake (is it?). My questions are: a) is this common practice? and b) I'll treat the first term as a regular diffusion term with the diffusivity given by last iteration's , but how can I best discretize the last one? Explicitly calculate the laplacian on a cell by cell basis, multiply by and put the result in the right-hand side? Any help apreciated. |
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