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-   -   Expert-param:: Cht diffusion scheme (http://www.cfd-online.com/Forums/cfx/78066-expert-param-cht-diffusion-scheme.html)

PCFD July 12, 2010 09:16

Expert-param:: Cht diffusion scheme
 
Hi,

can anybody tell me what the expert parameter cht diffusion scheme does mean? In which cases does it make sense to set it to its none default-values (=1-4 and 6)?

cht diffusion scheme: Specifies the diffusion scheme for CHT solids: 1=central (interior) , central (boundary); 2=posdef coefficients (interior), central (boundary); 3=posdef values (interior) , posdef values (boundary); 4=blended scheme (interior) , central (boundary); 5=posdef coefficients (interior), posdef values (boundary); 6=blended scheme (interior) , posdef values (boundary)

stumpy July 12, 2010 10:14

I can't think of any situation where you'd want to change this. What's the motivation for looking at this?

PCFD July 12, 2010 10:23

It would be nice if you let me participate your knowledge about this expert paramerer.

stumpy July 12, 2010 13:20

The parameter controls the numerical scheme used to solve the heat diffusion equation in a solid. There's different treatment for boundary nodes and interior nodes. posdef = Positive Definite; you can google this to get more details for the definition of Positive Definite. I assume central means central differencing, but don't know for sure. blended scheme would be a blending, presumably between the central and posdef schemes. "values" refers to the right-hand side of the matrix solution; i.e. if you have [A][x]=[b], then [b] are your "values". "coefficients" refers to [A].

PCFD July 12, 2010 13:49

Hi,

thanks for the information.


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