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

1D gas feeding/dissipating process

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

Reply
 
LinkBack Thread Tools Display Modes
Old   November 20, 2011, 23:55
Default 1D gas feeding/dissipating process
  #1
New Member
 
Qi Guan
Join Date: Aug 2011
Posts: 23
Rep Power: 5
entropies is on a distinguished road
Hello,

I have a 1d problem of simulating gas feeding and dissipating process. The initial state of the tube is nearly vacuum. And the gas coming in has an atomsphere condition.

I've built my code in non-dimensional form and the feeding process works OK. But the problem comes out in the dissipation process which I don't know how to apply a mass out b.c.

The case I did is at time (t=1), a gradually decreasing density and pressure is applied at the last cell of the pipe. But it turns out only the state at the last cell changed. The rest of the domain is still under gas feeding condition.

Thanks.
entropies is offline   Reply With Quote

Old   November 20, 2011, 23:56
Default
  #2
New Member
 
Qi Guan
Join Date: Aug 2011
Posts: 23
Rep Power: 5
entropies is on a distinguished road
I really want to upload a movie about this. But the size of the vedio is about 997K. Is there anyone knows how to upload it another way?

Thanks!
entropies is offline   Reply With Quote

Old   November 21, 2011, 00:26
Default Finally find a way to watch movie
  #3
New Member
 
Qi Guan
Join Date: Aug 2011
Posts: 23
Rep Power: 5
entropies is on a distinguished road
Here is the link to it. The flux is calculated by HLLC method.

http://youtu.be/_EVtg9JbBBA

Welcome to give critics.
entropies is offline   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
Constant velocity of the material Sas CFX 15 July 13, 2010 08:56
mass flow in is not equal to mass flow out saii CFX 2 September 18, 2009 08:07
Modelling of process of a filtration of carbonic gas DoctorPDV CFX 2 July 28, 2009 06:07
Two-Phase Buoyant Flow Issue Miguel Baritto CFX 4 August 31, 2006 12:02
Gas pressure question Dan Moskal Main CFD Forum 0 October 24, 2002 22:02


All times are GMT -4. The time now is 03:30.