# filling closed vessel with compressible gas

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

 December 20, 2013, 05:24 filling closed vessel with compressible gas #1 Member   Join Date: Oct 2011 Posts: 37 Rep Power: 6 Hi, I posted this problem before but I didn't get any suggestion. I decided to post it again with a simple scheme maybe someone could help me. I want to simulate the problem described in the figure by using multiphase model. I don't know how to set up the problem, particularly the BC. have you any idea about that? Thanks in advance. NAD

December 20, 2013, 05:27
#2
Member

Join Date: Oct 2011
Posts: 37
Rep Power: 6
sorry

the figure is within this post
Attached Images
 Figure.jpg (17.5 KB, 15 views)

 December 20, 2013, 05:46 #3 Senior Member   Join Date: Jan 2010 Location: Germany Posts: 268 Rep Power: 9 Do you not have any outlet in you problem? And Why multiphase if you are only using air

December 20, 2013, 06:00
#4
Member

Join Date: Oct 2011
Posts: 37
Rep Power: 6
Quote:
 Originally Posted by Zaktatir Do you not have any outlet in you problem? And Why multiphase if you are only using air
HI Zaktatir,
yes, without outlet.
Multiphase, because later I want to use solid particles instead air .
the simulation is very short in time, I mean the physical time is less than 0.2 millisecond.

 December 20, 2013, 06:47 #5 Senior Member   Join Date: Jan 2010 Location: Germany Posts: 268 Rep Power: 9 You said instead of air! That means in your final simulation how many fluids or media are present in your domain. Do you know the velocity of the entrance area or that will be atmospheric conditions at the entrance level?

December 20, 2013, 07:26
#6
Member

Join Date: Oct 2011
Posts: 37
Rep Power: 6
Quote:
 Originally Posted by Zaktatir You said instead of air! That means in your final simulation how many fluids or media are present in your domain. Do you know the velocity of the entrance area or that will be atmospheric conditions at the entrance level?
In the final simulation the vessel is filled with solid (with a known porosity).

at the inlet, I know that the compressible gas at temperature of 2500k, and pressure of 7.4 MPa, enters into the domain with velocity equals to 45 m/s.

 December 20, 2013, 07:30 #7 Senior Member   Join Date: Jan 2010 Location: Germany Posts: 268 Rep Power: 9 I think first of all you need to concentrate your self on getting stable setup for your air simulation: that will be though since there's no physical outlet in your domain. By the way do you expect reversal flow at the inlet? I think that it will come to that anyway. That's suggestion a pressure inlet at the inlet or modified pressure outlet with the inlet specification as backflow input

December 20, 2013, 07:43
#8
Member

Join Date: Oct 2011
Posts: 37
Rep Power: 6
Quote:
 Originally Posted by Zaktatir I think first of all you need to concentrate your self on getting stable setup for your air simulation: that will be though since there's no physical outlet in your domain. By the way do you expect reversal flow at the inlet? I think that it will come to that anyway. That's suggestion a pressure inlet at the inlet or modified pressure outlet with the inlet specification as backflow input
Yes, first I will do the "with air" simulation.
for the inlet, I have two choicesressure inlet or mass flow inlet.
if I choose the pressure inlet I would have reversal flow at the inlet. but I don't know how set up the inlet pressure .

sorry, but what do you mean be"modified pressure outlet with the inlet specification as backflow input"?

 Tags closed vessel, compressible, multiphase flow

 Thread Tools Display Modes Linear Mode

 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 OffTrackbacks are On Pingbacks are On Refbacks are On Forum Rules

 Similar Threads Thread Thread Starter Forum Replies Last Post cuteapathy CFX 14 March 20, 2012 07:45 Sas CFX 15 July 13, 2010 08:56 chanfire CFX 3 February 16, 2010 18:23 saii CFX 2 September 18, 2009 08:07 Dan Moskal Main CFD Forum 0 October 24, 2002 22:02

All times are GMT -4. The time now is 21:17.