# Pressure Gradient Parameter

 User Name Remember Me Password
 Register Blogs Members List Search Today's Posts Mark Forums Read

 September 29, 2006, 07:17 Pressure Gradient Parameter #1 Adam Guest   Posts: n/a Has anyone had experience with calculating the pressure gradient paremeter and using this during the solver run? The transition model uses this for its calculations, but i can't find any reference to that variable in the manuals, and it requres the calculation of the momentum thickness at every streamwise point in the flow, which will prove to be hard to do i think. Regards Adam

 October 1, 2006, 20:30 Re: Pressure Gradient Parameter #2 TB Guest   Posts: n/a hmmm.... I'll try to help. If you're looking for pressure gradient parameter for the boundary layer flow, the formula should be: (theta/U)*(dU/ds) where dU/ds is local free stream velocity gradient and theta is the momentum thickness. However, I didn't calculate this during solver run, only at the end of simulation. Are you working on Transient or steady state simulation?

 October 2, 2006, 04:03 Re: Pressure Gradient Parameter #3 Adam Guest   Posts: n/a I'm running both steady state and transient. Its the automatic calculation of the momentum thickness that is causing me some problems. I know that CFX must do it for their transition model, but am not sure if I can get access to that part of the code. Adam

 October 2, 2006, 06:23 Re: Pressure Gradient Parameter #4 TB Guest   Posts: n/a As I'm aware, calculation of momentum thickness always involves some integration of velocity profile. The quickest way is to contact your support for solutions.

 October 3, 2006, 08:50 Re: Pressure Gradient Parameter #5 Kiddo Guest   Posts: n/a Hello, try to use UserFortran, there's a default subroutine: for ex. CALL USER_GETVAR('Water at RTP.Pressure.Gradient',CRESLT, pPGRADIENT,CZ,DZ,IZ,LZ,RZ)

 October 4, 2006, 04:27 Re: Pressure Gradient Parameter #6 TB Guest   Posts: n/a Hi... I think that's not the idea of a pressure gradient parameter.

 Thread Tools Display Modes Linear Mode

 Posting Rules You may not post new threads You may not post replies You may not post attachments You may not edit your posts BB code is On Smilies are On [IMG] code is On HTML code is OffTrackbacks are On Pingbacks are On Refbacks are On Forum Rules

 Similar Threads Thread Thread Starter Forum Replies Last Post val17lr FLUENT 5 July 13, 2010 15:15 SalvoCalvo Main CFD Forum 0 March 11, 2010 07:52 Josyula FLUENT 2 December 23, 2009 08:26 Luc3er FLUENT 1 October 30, 2009 07:46 Sheila Main CFD Forum 3 September 24, 2005 13:58

All times are GMT -4. The time now is 11:48.

 Contact Us - CFD Online - Privacy Statement - Top