# use of face areas in flux function

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 January 31, 2005, 08:09 use of face areas in flux function #1 Andrew Garrard Guest   Posts: n/a I am I trying to solve for the following UDS flux function using the DEFINE_UDS_FLUX macro: alpha del.(UDS0) or alpha nabla(UDS0) I got this UDF (simplified) back from the fluent guys: F_AREA(A, f, thread); duds0dx = C_UDSI_G(c0, tc0, 0)[0]; dudsi0dy = C_UDSI_G(c0, tc0, 0)[1]; return alpha * (duds0dx*A[0] + duds0dy*A[1]); My question is this: Do I need the face areas A[0] and A[1] in my return function? They are playing havoc with my results and making thre returned function look rather unphysical. Any comments would be greatly appreciated.

 February 1, 2005, 14:46 Re: use of face areas in flux function #2 Giordano Bruno Guest   Posts: n/a Hi Andrew, I think these expressions are correct if you have to define the term del(alpha del[UDS0]) as in your old message, in this way you convert a volumetric term in a flux. About the face areas: ...you have to watch if they are positive or negative, maybe this changes your resuls???Let me know... and please, if you can, give a look to my last message http://www.cfd-online.com/Forum/fluent.cgi?read=24397 . Giordano Bruno

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