CFD Online Logo CFD Online URL
Home > Forums > CFX

Inviscid flow with shocks/ Residual convergence

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

LinkBack Thread Tools Display Modes
Old   October 23, 2013, 07:47
Default Inviscid flow with shocks/ Residual convergence
New Member
Join Date: Jun 2012
Location: Finland
Posts: 19
Rep Power: 5
Kirjain is on a distinguished road

I would require a bit of help in the pre-processing of flow scenario in a dilating duct. In order to simulate inviscid flow I've set the its properties to laminar and all wall boundary conditions to free-slip, but I've also heard from different sources that one should set the viscosity as naught - a precedure that makes sense in theory but seems difficult in practice. If I would set the value of viscosity to naugt that would make my Reynolds number infinite, which would undoubtedly lead to complications further on. As a high Reynolds number implies turbulent flow, I'm afraid that using all settings mentioned above would make the system fully unphysical. What would, in your opinion, be the best way to achieve inviscid flow? A further complication will arise due to shocks in the flow because they would (in real life) affect the local viscosity values in the flow. Is the assumption of inviscid flow even justified in a problem involving a pseudo-shock?

The task that I'm working on is actually only a pre-phase to viscous shock train simulation, something that should provide me with a little bit of insight before I go and simulate the actual, viscous case. Having done something similar before, I remember I had a lot of trouble in trying to get the residuals to converge under the value of about 10^-6. Furthermore I remember I could not access Residual Contour data in CFX-Post when trying to control where the problem areas in the flow were. I was (and will be) using a BSL turbulence model if I'm not terribly mistaken. Could it be that CFX-Post simply doesn't offer Residual Contour data for this model or might I have made a mistake of some sort in CFX-Pre? I'm using the Air Ideal Gas model with total energy.

Cheers for helping, if you need any more information just let me know and I'll provide!
Kirjain is offline   Reply With Quote


inviscid flow, pseudo-shock, shock wave

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
transsonic nozzle with rhoSimpleFoam Unseen OpenFOAM Running, Solving & CFD 7 April 16, 2014 03:38
SLTS+rhoPisoFoam: what is rDeltaT??? nileshjrane OpenFOAM Running, Solving & CFD 4 February 25, 2013 05:13
Computational time sunnysun OpenFOAM Running, Solving & CFD 5 March 16, 2009 04:32
Unknown error sivakumar OpenFOAM Pre-Processing 9 September 9, 2008 12:53
Convergence moving mesh lr103476 OpenFOAM Running, Solving & CFD 30 November 19, 2007 15:09

All times are GMT -4. The time now is 18:19.