CFD Online Logo CFD Online URL
www.cfd-online.com
[Sponsors]
Home > Forums > Software User Forums > ANSYS > CFX

total pressure drop and momentum source setting

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

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old   July 25, 2008, 06:58
Default total pressure drop and momentum source setting
  #1
Li
Guest
 
Posts: n/a
I am doing simulations about the pressure drop through a vavle in CFX11.0. The simulations are quite smaller than the experiments. It is becoming worse after I refined the mesh. I don't know why. I calculated the total pressure using this equation: massflowave(total pressure)@location and get the pressre drop between the inlet and outlet. Would you give me any hints to improve the simulations? I use k-e model and I am sure the results are converged at 1.0E-5 with max residual.

As to momentum source setting, I had a look at the help documents. I am not sure that I understood them well. Is that true that isotropical loss model and directional loss model are used in porous resistence? In my case, should I use the general momentum source if I want to try another way to do the simulations.

If you have any suggestions, please tell me. Thank you very much!
  Reply With Quote

Old   July 25, 2008, 12:44
Default Re: total pressure drop and momentum source settin
  #2
brunoc
Guest
 
Posts: n/a
Li,

Monitoring total pressure gives you how much energy the fluid lost through your device. Pressure drops are usually measured in terms of Static Pressure.

  Reply With Quote

Old   July 28, 2008, 03:33
Default Re: total pressure drop and momentum source settin
  #3
Li
Guest
 
Posts: n/a
Hi Brunoc, thank you for your reply.
  Reply With Quote

Reply

Thread Tools Search this Thread
Search this Thread:

Advanced Search
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 Off
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
Pipe Flow - Pressure Drop Daniel L FLOW-3D 2 December 10, 2010 05:23
Pressure jump and momentum source Tanya FLUENT 1 June 4, 2009 16:22
2D momentum source for pressure loss Bernhard Dobmeier CFX 0 December 5, 2006 05:05
Periodic boundaries and pressure drop MatejK CFX 2 July 12, 2005 05:47
Setting momentum source for periodic calculation lego CFX 3 December 16, 2002 18:02


All times are GMT -4. The time now is 17:25.