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

Problem on boundry of two phase flow

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

Reply
 
LinkBack Thread Tools Display Modes
Old   June 24, 2003, 22:08
Default Problem on boundry of two phase flow
  #1
youngan
Guest
 
Posts: n/a
hi,all I have trouble to define an outlet of gas-solid two phase flow, which gas phase can pass through while solid phase can't. How can i achieve this.
  Reply With Quote

Old   June 25, 2003, 06:43
Default Re: Problem on boundry of two phase flow
  #2
Jan Rusås
Guest
 
Posts: n/a
I assume that you are talking about an euler-euler solution. I had a similar problem once (in CFX4.4), I think I solved the problem by setting ambient conditions for the solid phase to zero and solved the problem as transient. (I had to solve it transient because I only had one outlet and the solver will try in a steady state to equalize inlet-outlet.) Hope it helps
  Reply With Quote

Old   June 30, 2003, 02:11
Default Re: Problem on boundry of two phase flow
  #3
youngan
Guest
 
Posts: n/a
Thank you for your suggestion. you are right, i am talking about an euler-euler solution and my problem is similar with the one you once meet. But my problem still remains. My problem is as follow: Gas-solid flow goes into a tank through an inlet and there is an outlet which only gas can pass through. so the solid remains in the tank. But i do not know how to difine such an outlet in CFX4.4. I have tried several times with different method. 1. I define INLET and MASS FLOW BOUNDARY as the inlet and outlet and define the flux of the MASS FLOW BOUNDARY as 1*1.0 and 1*0.0. The result is both gas and solid phase pass through the MASS FLOW BOUNDARY. 2. I define PRESSURE and MASS FLOW BOUNDARY as the inlet and outlet and define the flux of the MASS FLOW BOUNDARY as 1*1.0 and 1*0.0. The result is no solid came into the tank through the inlet. 3. I define INLET and MASS FLOW BOUNDARY as the inlet and PRESSURE and define the normal velocity of the oulet as zero by using USRBCS. The result is both gas and solid phase pass through the MASS FLOW BOUNDARY. 4. I want to define the outlet as Porous walls. But I do not know how to define.

Best regards!
  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
Multiphase phase (gas-solid) flow using Eulerian-Granular medel ( divergence problem) jessie FLUENT 3 May 29, 2014 11:05
Boundary condition problem for open channel flow Andy CFX 8 October 1, 2012 07:45
problem with two phase flow (air injected in water) miles_davis OpenFOAM 14 October 11, 2011 17:53
error in two phase flow problem mvee FLUENT 0 March 28, 2007 05:17
Can 'shock waves' occur in viscous fluid flows? diaw Main CFD Forum 104 February 16, 2006 06:44


All times are GMT -4. The time now is 16:57.