CFD Online Logo CFD Online URL
www.cfd-online.com
[Sponsors]
Home > Forums > FLUENT

Who can answer me /pressure question

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

Reply
 
LinkBack Thread Tools Display Modes
Old   June 21, 2007, 10:59
Default Who can answer me /pressure question
  #1
pam
Guest
 
Posts: n/a
Hi I need to know how can fluent predict the static pressure at inlet depending on the velocity inlet boundary for a pipe flow? Is there anyone have any comments? knowing that i was use two phase flwo

Pam

  Reply With Quote

Old   June 21, 2007, 17:56
Default Re: Who can answer me /pressure question
  #2
Answer
Guest
 
Posts: n/a
Extrapolated from interior based on reconstruction gradients. These reconstruction gradients are calculated using Venkatakrishnan's limiter.

  Reply With Quote

Old   June 22, 2007, 01:14
Default Re: Who can answer me /pressure question
  #3
pam
Guest
 
Posts: n/a
Hello thank you to the answer can you tell me what you mean by Venkatakrishnan's limiter with more details?

Thank you pam
  Reply With Quote

Old   June 22, 2007, 08:40
Default Re: Who can answer me /pressure question
  #4
rosol
Guest
 
Posts: n/a
Dear Pam

Fluent calculate the pressure by solving the momentum eqquation (N.S.E) which contain the pr.gradient which is first drivative so it need one boundary condition most be specified in inlet or in outlet in your case you must choos the outlet B.C is pr. outlet so the fluent will solve the N.S.E and from it calculate the distribution of pr. I hhope this answer help you and if not please don't hestite to contact me
  Reply With Quote

Old   June 22, 2007, 09:14
Default Re: Who can answer me /pressure question
  #5
pam
Guest
 
Posts: n/a
Thanks rosol to the answer. Actually FLUENT give me very less values of pressure gradient when I compared it with a paper in the same problem as mine knowing that I used the same BC that mentioned in that paper but the results still less can you tell me why?

pam

  Reply With Quote

Old   June 22, 2007, 23:51
Default Re: Who can answer me /pressure question
  #6
rosol
Guest
 
Posts: n/a
May be due to the properties of fluids used .or the operating pr. used in the paper diffrent with which used by you or may be the paper define the pr. in absolute while fluent sue the gauge pr.

Regards

  Reply With Quote

Old   June 23, 2007, 01:10
Default Re: Who can answer me /pressure question
  #7
pam
Guest
 
Posts: n/a
No i made all the same as in the paper?

Pam
  Reply With Quote

Old   June 23, 2007, 07:50
Default Re: Who can answer me /pressure question
  #8
rosol
Guest
 
Posts: n/a
I think there are some thing wrog .since the results of fluent is correct if the B.C uesd are correct .Please check your case B.C , velocity inlet and other effective parameters .I hope you find the cause
  Reply With Quote

Reply

Thread Tools
Display Modes

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 Off
Trackbacks are On
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
To red lemon pls answer K.Baker FLUENT 0 August 2, 2007 09:41
question in need of an answer cfd_student Main CFD Forum 2 December 17, 2005 07:00
Convergence Question James FLUENT 2 October 29, 2005 14:59
Poisson Solver question Suresh Main CFD Forum 3 August 12, 2005 04:37
A simple question (Where is the answer? Not yet!!) Mecobio Main CFD Forum 1 February 12, 2004 08:28


All times are GMT -4. The time now is 22:38.