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

Shock tube at high mach numbers-ANSYS Fluent

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

Reply
 
LinkBack Thread Tools Display Modes
Old   February 9, 2012, 20:58
Default Shock tube at high mach numbers-ANSYS Fluent
  #1
New Member
 
Aditya
Join Date: Dec 2011
Posts: 28
Rep Power: 4
dsn2491 is on a distinguished road
HI,

I am simulating the driven section and th shocked gas region of a shock tube in fluent. there seems to be a small jump in the initiallly set values and then the variation reduces and the solution proceeds as it is supposed to proceed.

I am using an explicit AUSM scheme with first order upwind for flow option in spatial discretization. the courant number is set to 1. the mach number of solution is 1.7

Can anyone tell me why this is happening? the effect increases drastically and the calculation just goes off track whenthe mach number is high(M=2.1,2.8)

What are the changes that need to be done...is the courant number or any other thing that i need to look into

response will be highly appreciated.

Attached are the lineouts for the M=1.7 case
Attached Images
File Type: jpg pressure lineout.jpg (44.5 KB, 31 views)
File Type: jpg temp lineout.jpg (44.2 KB, 26 views)
File Type: jpg density lineout.jpg (42.6 KB, 23 views)
dsn2491 is offline   Reply With Quote

Old   March 7, 2012, 13:34
Default
  #2
New Member
 
Join Date: Mar 2011
Posts: 3
Rep Power: 5
xpto56 is on a distinguished road
Hi!!!
Unfortunately I'll be of no help to your problem.
I'm also trying to work my way around the shock tube problem in Fluent. So, I was hopping if you could lead my way into setting the driver and driven conditions properly.

Thanks!!!
xpto56 is offline   Reply With Quote

Old   March 8, 2012, 19:28
Default
  #3
New Member
 
Aditya
Join Date: Dec 2011
Posts: 28
Rep Power: 4
dsn2491 is on a distinguished road
Hi,

I have a UDF set-up which initialises the driven gas of the shock tube. I only have the driven gas in my simulation so its basically unshocked gas and a small portion of the shocked gas (State 2).

I dont have the driver gas section of the shock tube.
dsn2491 is offline   Reply With Quote

Old   May 21, 2012, 21:07
Default
  #4
Member
 
navid
Join Date: Jan 2010
Posts: 76
Rep Power: 6
ndabir is on a distinguished road
Hi, could you please let me know how did you set up the B.C for your simulation?
ndabir 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
Shock Tube problem mouna lamnaouer FLUENT 1 September 22, 2011 13:47
FSI, Fluent Ansys coupling Greg Carnie FLUENT 5 January 7, 2010 20:15
Could anybody help me see this error and give help liugx212 OpenFOAM Running, Solving & CFD 3 January 4, 2006 19:07
shock tube validation AB Main CFD Forum 3 December 10, 2004 08:31
Multicomponent fluid Andrea CFX 2 October 11, 2004 06:12


All times are GMT -4. The time now is 23:00.