# CEL expression

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 June 12, 2007, 05:12 CEL expression #1 Selim Guest   Posts: n/a Hallo, I have the option Velocity u.Gradient x in CFX 5 ,fine. But I need also gradient of this expression? How can I do that? thnks Selim

 June 12, 2007, 09:08 Re: CEL expression #2 opaque Guest   Posts: n/a Dear Selim, Would you mind sharing your need for a second derivative of velocity? Perhaps there are other alternatives.. The gradient of the gradient of a vector is a third order tensor, that is not available via CEL. Opaque

 June 13, 2007, 10:26 Re: CEL expression #3 Selim Guest   Posts: n/a Hi opaque, Actually I need the gradient of a scalar. Temprature,x-component of velocity etc. Is there a way to get from CFX post? Thnks, SElim

 June 14, 2007, 07:27 Re: CEL expression #5 Selim Guest   Posts: n/a Thanks in advance, Isnt there anyway to do it with Post? Not so easy for me to do the calculations from the begining Regards, Selim

 June 14, 2007, 09:03 Re: CEL expression #6 opaque Guest   Posts: n/a Dear Selim, If your case is steady state, you only need to restart the solver for 1 iteration.. For the transient case, do you need the gradient at all timesteps, or only at the last one? For the latter, just run an additional time step. Hope it helps, Opaque

 June 14, 2007, 10:51 Re: CEL expression #7 Sohag Guest   Posts: n/a Sorry to distrub both of you. I also want to wite a velocity gradient e.g at the wall velocity u=(delu/deln), n is the normal inword to the wall. How I can write it using CEL expressions in CFX-10.I would be very grateful to you if you give me any informations.Please help me. Sohag

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