# transient pressure correction

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 April 21, 2004, 12:47 transient pressure correction #1 dominique Guest   Posts: n/a hi, i'm doing pseudo-compressibility pressure correction in transient low R_e flow in a tube (2D). how do I choose optimal ratio between dt for velocity update and (pseudo) dt for pressure correction? in particular: is it better to do more velocity corrections and few pressure corrections or vice versa? thank you.

 April 22, 2004, 07:51 Re: transient pressure correction #2 vesi Guest   Posts: n/a If you are using pseudo-compressibility method, then pressure is also updated via time or pseudo time marching, then you do the same times of corrections to both V and P.

 April 22, 2004, 17:03 Re: transient pressure correction #3 dominique Guest   Posts: n/a you mean, correct velocity, correct pressure and again, in a loop? yes, that is clear, but what about "dt", how do I set optimal relation between two delta t's for both explicit time marching...? thanks domi

 April 23, 2004, 05:29 Re: transient pressure correction #4 versi Guest   Posts: n/a Years Ago AIAA Journal had papers discussing pseudo time sep and physical time step. The pseuodtime step has the meaning of relaxation factor, it can be larger than a nondimensional physical Dt. may be 10 times up, I remebered. If the inner iteration is implicit can be 10^12 up. (== discarding it at all)

 April 23, 2004, 11:14 Re: transient pressure correction #5 centaur_ks Guest   Posts: n/a read paper on dual time step approch , try one by Yoon and Jameson on LU-SSOR for eular and NS eqn and there are some more by Jameson that explains dual time stepping approch quite well.

 May 27, 2004, 08:03 Harlow & Amsden #6 enis Guest   Posts: n/a Hello everyone, Is there anybody who are using IMF(Implicit Multifield Model of Harlow & Amsden) technique for their studies?I want to ask some questions. thanks

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