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

help:pumping gas into a closed domain

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

Reply
 
LinkBack Thread Tools Display Modes
Old   April 9, 2006, 10:44
Default help:pumping gas into a closed domain
  #1
frank
Guest
 
Posts: n/a
Hi,

How to perform a simulation of pumping of a gas into a closed domain with Fluent? You are very kind of giving some guides about the subject mensioned above. Better, there is a closed domain with a velocity inlet but any outlet. How to make it with Fluent. I have tried, but the results showed no variance of density and pressure in the interior of the domain.How so?

Thanks in advance.

Best regards.
  Reply With Quote

Old   April 9, 2006, 12:22
Default Re: help:pumping gas into a closed domain
  #2
Ahmed
Guest
 
Posts: n/a
This is a classical tank pressurising problem. Your inlet BC has to be pressure inlet bc. Good Luck and be patient, it takes a lot of computing time
  Reply With Quote

Old   April 9, 2006, 23:23
Default Mr. Ahmed: about pumping gas
  #3
frank
Guest
 
Posts: n/a
Dear Mr. Ahmed,

Thank for your advice.

I want to know how to control the mass of pumping gas, if setting inlet BC into pressure-inlet BC?

Can you give me some detailed describtion or a simple case file with your kindness?

Best regards!

Frank
  Reply With Quote

Old   April 10, 2006, 08:12
Default Re: Mr. Ahmed: about pumping gas
  #4
Ahmed
Guest
 
Posts: n/a
Spend time studying the physics of your problem

The pressure inside the tank is changing with time,

You have to solve unsteady problem.

If you want to control the inlet mass flow you have to change the inlet pressure accordingly (the speed at the inlet is dependent on the pressure difference at the inlet) Start using a very small time step (1*10-6 s for example) and keep increasing the time step till you reach your objectives from the analysis. Good luck
  Reply With Quote

Old   April 11, 2006, 09:27
Default Mr. Ahmed: about pumping gas
  #5
Frank
Guest
 
Posts: n/a
Dear Mr. Ahmed,

Thanks a lot for your patience for asking my question! I got an problem: when I use a 2-Eulerian model , I find I can't use the ideal gas model for phase gas any more. I have to select the ideal gas model for phase gas which condition for comprssible problems described in Fluet Help document. But I have to use a 2-Eulerian model for my problem which contains a gas phase and a solid granula phase at same time(the fraction of granula phase is large not suitable for selecting the Mixture model). What shall I do?

Thanks again!
  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
Default domain jaho CFX 5 February 16, 2014 01:00
gas diffusion through membrane sosat1012 CFX 0 September 8, 2010 08:14
Constant velocity of the material Sas CFX 15 July 13, 2010 08:56
CHT in gas turbine, solid domain Alexandre Main CFD Forum 1 June 9, 2009 07:51
PLEASE, HELP: INTERPOLATION + CLOSED DOMAIN Sasha FLUENT 4 May 27, 2008 23:08


All times are GMT -4. The time now is 04:36.