To compute the derivatives at cell centers in a user defined function, one can make use of the several macros provided by Fluent, such as C_DUDY(c,t). However, this will not work for the inviscid solver. It will only work when viscous effects are included (laminar or turbulence models). I will expand on this in the articles to follow.
Cite as:
Saad, T. "Computing Derivates in Fluent UDFs".
Weblog entry from
Please Make A Note.
https://pleasemakeanote.blogspot.com/2008/06/computing-derivates-in-fluent-udfs.html
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