# Reynolds contour plotting in cfx-post

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 June 2, 2009, 03:16 Reynolds contour plotting in cfx-post #1 Member   Join Date: Jun 2009 Posts: 50 Rep Power: 9 hi: i want to plot a contour plot for reynolds number in default domain in cfx-post...how can i do it??? best regards

 June 2, 2009, 19:02 #2 Super Moderator   Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 12,723 Rep Power: 99 Hi, Define a function for Reynolds number, then it will appear as a variable you can do contours with. Have a look in the tutorials for how to do this. Glenn Horrocks

 June 3, 2009, 00:49 #3 Member   Join Date: Jun 2009 Posts: 50 Rep Power: 9 hi Glenn Horrocks and thank you very much for all your helps: the geometry is very complicated and i cant define any effective length in reynolds num.also the direction changes and i cant use parameters like y or z as diameter in CEL. the tutorial is very simple and i cant use it.

 June 3, 2009, 07:34 #4 Super Moderator   Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 12,723 Rep Power: 99 Hi, Well if you can't define a length scale then how can you work out a Reynolds Number? I am guessing you are looking for the surface Re number to look for turbulence transition or turbulent boundary layer growth along a surface. This would be tricky to visualise on an arbitrary geometry. If you are using the turbulence transition model I think one of the variables modelled is in effect the surface Re number, that might help. Otherwise you might be able to define a length scale using surface streamlines where you use the position along the streamline as your length scale. Just an idea, it would be tricky to get working. Glenn Horrocks

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