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-   -   UDF in MDM Tutorial (http://www.cfd-online.com/Forums/fluent/38752-udf-mdm-tutorial.html)

mAx November 28, 2005 08:34

UDF in MDM Tutorial
 
Hi, I have a question about UDF. In the MDM Tutorial, the UDF calculates the piston's motion produced from the drop pressure within the valve. When I take a closer look at the UDF,I don't understand 2 stuffs. * what means F_AREA_CACHE? I understand F_AREA, but ...-CACHE? *in the CG_MOTION(), the pressure force on the piston is calculated, but I don't achieve to recognize if there is any profection for the force calculation. I mean if the piston slides on the x axis, the pressure force has to be computed along the x axis, In the UDF I don't see anything which give the choice for choosing x,y or z axis.

Any Idea Thanks mAx


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