Dear all, I finish a run and need to do post prcessing work on a zone. for example, make a contour plot at section in the zone. The problem is that how can I get the velocity or gradient(dt/dx or dp/dx etc) in the local coordinate system. would you please give me a hand. Thanks a lot in advance! Charles

display/define iso/surface, line,etc

Thanks for your attention. but the command you mentioned just make a surface from a zone. when doing processing work, the result on the surface is still based on the global coordinate. I need the result based on the local coordinate system. How can FLUENT do this work? Thanks again. Charles