How To recall previous positions ? -- CFD Online Discussion Forums

June 5, 2009, 09:57	How To recall previous positions ?	#1
Aqllex New Member Alex Join Date: Jun 2009 Posts: 1 Rep Power: 0	Hello Everyone, I've been looking on the forum but obiously noOne has ever wanted to do that. I am currently writing a UDF to store the position of the maximun vorticity of a pair of vortex in ground effect so that i can draw their trajectory. It works well, I am storing the position of the max vorticity in a txt file but Now I want to recall the last position so I can tell Fluent where to search for the next position. I ve been trying to get the velocity at the previous time step in order to discretize itbut I don't know how to, is it right to do C_V(c+1,t)-C_V(c-1,t)/2DX ?/ Thank you very much Alex

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