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-   -   external flow with deforming boundary (http://www.cfd-online.com/Forums/fluent/93544-external-flow-deforming-boundary.html)

jtodd3 October 18, 2011 17:24

external flow with deforming boundary
 
I am trying to use Fluent to simulate external flow over a deforming object. The object will be a thin line that changes shape with time. For example a straight line that becomes a curve, or a moving sine wave.

I am trying to learn how to write UDFs at the moment. My first question is: Do I use DEFINE_GEOM, DEFINE_GRID_MOTION, or both?

I have been trying to use some UDFs from a Fluent tutorial and hooking them to my mesh. This only gives me negative cell volume errors. Can someone explain why this is.

Thank you.


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