Reynolds contour plotting in cfx-post

mortazavi · June 2, 2009, 03:16

hi:
i want to plot a contour plot for reynolds number in default domain in cfx-post...how can i do it???
best regards

ghorrocks · June 2, 2009, 19:02

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

mortazavi · June 3, 2009, 00:49

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.

ghorrocks · June 3, 2009, 07:34

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

June 2, 2009, 03:16	Reynolds contour plotting in cfx-post	#1
mortazavi Member SMN Join Date: Jun 2009 Location: CANADA Posts: 71 Rep Power: 16	hi: i want to plot a contour plot for reynolds number in default domain in cfx-post...how can i do it??? best regards

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June 2, 2009, 19:02		#2
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,703 Rep Power: 143	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
mortazavi Member SMN Join Date: Jun 2009 Location: CANADA Posts: 71 Rep Power: 16	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
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,703 Rep Power: 143	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