# plasma modeling

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 August 18, 2011, 03:16 plasma modeling #1 New Member   miroslav repka Join Date: Aug 2011 Location: Slovakia Posts: 5 Rep Power: 8 Sponsored Links Can anybody help me with modeling of plasma in fluent?i try to define external transport equations,but i dont know how to assign some diferential operators to the macros in fluent,for example,laplace-nabla^2,derivative,rotation of vector,and divergence of tensor, thank u

 August 18, 2011, 06:21 #2 Senior Member     Amir Join Date: May 2009 Location: Montreal, QC Posts: 739 Blog Entries: 1 Rep Power: 16 You can involve extra transport equations via UDS in FLUENT. __________________ Amir

 August 18, 2011, 07:10 transport equations #3 New Member   miroslav repka Join Date: Aug 2011 Location: Slovakia Posts: 5 Rep Power: 8 thank u but i do it via UDS and UDF,the problem is how to define some mathematical operators to UDF ,for example lapace ,rotation of the vector and divegence of the tensor and UDF manual is not sufficient for this..

August 18, 2011, 11:28
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Amir
Join Date: May 2009
Location: Montreal, QC
Posts: 739
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Rep Power: 16
Quote:
 Originally Posted by miroslav1312 thank u but i do it via UDS and UDF,the problem is how to define some mathematical operators to UDF ,for example lapace ,rotation of the vector and divegence of the tensor and UDF manual is not sufficient for this..
Dear miroslav,

I don't think that such operators would be accessible via UDF ... (that's great if you can find them).
But maybe it would be possible to implicitly use UDS term to model your desired terms with some changes; e.g, diffusion term as laplacian, convection as divergence ... you may simplify other terms to achieve set of scalar equations and then use UDSs.
If non of these suggestions work, it's better to switch to openFOAM where you would be completely free to define equations.

Bests,
__________________
Amir

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