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-   -   Calculation of face vaules with udf (http://www.cfd-online.com/Forums/fluent/38477-calculation-face-vaules-udf.html)

rom November 3, 2005 03:04

Calculation of face vaules with udf
 
I have got a problem with the calculation of face vaules from cell center values. For an interior face i could caculate the face value either from the c0 cell side or the c1 cell side, using the cell values and the gradient. For a species it looks like this

from c0

face_value0=C_YI(c0,c0thread,i)+NV_DOT(C_YI_G(c0,c 0thread,i),dr0)

and from c1

face_value1=C_YI(c1,c1thread,i)+NV_DOT(C_YI_G(c1,c 1thread,i),dr1)

dr is the vector from cell center to the face center. Both face values should be identical but unfortunatly they are not. I tried it on a sturcured meshe with full converged soultion. Is there any other way to get consistent values for the faces?

Thanks for any suggestions

RoM


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