# help

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 June 1, 2011, 10:55 help #1 New Member   xiaobao jia Join Date: Jun 2011 Posts: 7 Rep Power: 8 Hello; I have to modify the velocity of every node in every iteration like ux+5, Uy-2, Uz+0, how can I use cel to fix it? any ideas? thanks a lot. regards jia

 June 1, 2011, 18:31 #2 Super Moderator   Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 14,202 Rep Power: 110 You cannot do this in CEL. And I cannot see why you would want to do it anyway, there is no way this is going to converge. What are you trying to do?

 June 2, 2011, 09:47 #3 New Member   xiaobao jia Join Date: Jun 2011 Posts: 7 Rep Power: 8 thank you Mr. Glenn Horrocks, you are the guy I need to ask this question. I am simulating a rotating airfoil, what I like to do is that I will put -w*r term in the convective term and diffusion term through velocity variations. I do think this is physics simulation of this problem rather than rotating mesh or domain. Do you think I can fix this in cfx with user function? regards xiao

 June 2, 2011, 19:18 #4 Super Moderator   Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 14,202 Rep Power: 110 You cannot do this by simply adding and subtracting velocity components! Use the built-in rotating frame of references to do this. Of if this is not suitable please explain why not.

 June 3, 2011, 11:03 #5 New Member   xiaobao jia Join Date: Jun 2011 Posts: 7 Rep Power: 8 Hi Mr. Glenn This material is interesting, I will try this. Then I will inform you the result. thanks xiao

 June 13, 2011, 10:58 #6 New Member   xiaobao jia Join Date: Jun 2011 Posts: 7 Rep Power: 8 Hi; Mr. Glenn I think this method is only valid for Euler equation ( inviscid solution), because rotation velocity can not give full or a part of natural boundary layer velocity. regards xiao

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