In CFD-post, why wall velocity value is not consistant with that of the contour?

Andy Von · December 13, 2015, 01:52

Hi, everyone,
I'm using CFX to solve my case and CFD-post to do the post-process.
In my simulation, the domain is rotating and the wall is stationary relative to the domain. Theoretically, the relative velocity should be 0 throughout the wall, and the velocity contour confirms this. however, when I output the velocity value on the wall, I found that all the velocity values are not zero. This really bothers me a lot.
It would really help me a lot if anyone could explain the reason.
Thanks a lot!

Sorry I have problem attaching any figure.

ghorrocks · December 13, 2015, 04:14

FAQ: http://www.cfd-online.com/Wiki/Ansys...t_the_walls.3F

Andy Von · December 13, 2015, 22:40

Thank you ghorrocks.

I think i should check the FAQ first next time

December 13, 2015, 01:52	In CFD-post, why wall velocity value is not consistant with that of the contour?	#1
Andy Von New Member Andy Von Join Date: Jun 2013 Posts: 3 Rep Power: 12	Hi, everyone, I'm using CFX to solve my case and CFD-post to do the post-process. In my simulation, the domain is rotating and the wall is stationary relative to the domain. Theoretically, the relative velocity should be 0 throughout the wall, and the velocity contour confirms this. however, when I output the velocity value on the wall, I found that all the velocity values are not zero. This really bothers me a lot. It would really help me a lot if anyone could explain the reason. Thanks a lot! Sorry I have problem attaching any figure.

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December 13, 2015, 04:14		#2
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,696 Rep Power: 143	FAQ: http://www.cfd-online.com/Wiki/Ansys...t_the_walls.3F

December 13, 2015, 22:40		#3
Andy Von New Member Andy Von Join Date: Jun 2013 Posts: 3 Rep Power: 12	Thank you ghorrocks. I think i should check the FAQ first next time