# BC problem

 Register Blogs Members List Search Today's Posts Mark Forums Read

 November 19, 2003, 04:41 BC problem #1 newone Guest   Posts: n/a Hi Experts, I am solving a problem involving convergent divergent nozzle. I am employing pressure BC at both ends. Now I have two problems. 1. After post processing I am seeing the Pstat greater (around double) than what I have applied as BC at inlet as well as at outlet. 2. I want to apply only presure at outlet and temperature to be calculated by code. But StarCd wants temperature also at pressure BC. How to do this? Help. -

 November 21, 2003, 00:58 Re: BC problem #2 Nyquist Guest   Posts: n/a Answer No.1 question. The pressure in STAR-CD is relative pressure. If the environment(or inlet) pressure is 1atm, then you have to set the referance pressure 1atm and in inlet BC set 0atm.

 November 21, 2003, 14:22 Re: BC problem #3 Brian Guest   Posts: n/a Answer to Question 2: True, you have to specify temperature at pressure boundaries. But this temperature is only used if the flow at the boundary is INTO the domain. If the flow is out of the domain, the temperature is extrapolated from the interior, in the same was as on outlet boundaries. Same goes for other scalar quantities at pressure boundaries, like TE and ED.

 November 24, 2003, 04:14 Re: BC problem #4 Daria Guest   Posts: n/a If scalar quantities are extrapolated from the interior by default, what means switch ZERO GRAD for scalar quantities TE,ED,T?

 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 Fang Jin FLUENT 5 February 17, 2011 06:38 Deepak R FLUENT 1 December 6, 2007 10:37 saad Main CFD Forum 4 November 1, 2007 08:45 Se-Hee CFX 2 June 10, 2007 06:29 san FLUENT 2 April 3, 2006 23:37

All times are GMT -4. The time now is 20:15.