CFD Online Logo CFD Online URL
Home > Forums > Main CFD Forum

Pathologies of Simple Flux Jacobian Approximation

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

LinkBack Thread Tools Display Modes
Old   July 29, 2013, 10:41
Default Pathologies of Simple Flux Jacobian Approximation
New Member
Join Date: Jul 2013
Posts: 4
Rep Power: 6
CFDJosh is on a distinguished road
Hi everyone,

I am working on a CFD code that has a very simple approximation to A (let's write the Euler equations as Q_t + AQ_x = 0, A is the flux Jacobian). If we're iterating on a time step, it currently simply approximates A^(k+1) with A^(k) from the previous iteration with a simple limiter to prevent Gibbs. It's been more or less functional for what this code does, but I suspect this not going to hold up well under various supersonic conditions. Thing is, I'm so used to more advanced methods that I no longer remember why this is a bad idea.

What sort things should I expect to be going wrong with this method and look for in order to compare it with Roe and other more sophisticated methods? The most obvious thing is that it won't handle shock tube problems very well, or any other problem with a moving shock, but what about steady-state problems?

Last edited by CFDJosh; July 29, 2013 at 11:45.
CFDJosh is offline   Reply With Quote


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
SIMPLE algorithm in 3D cylindrical coordinates zouchu Main CFD Forum 1 January 20, 2014 18:02
solar heat flux through roof Tim FLUENT 1 January 17, 2007 17:01
Basic question: UDF for wall heat flux Carl FLUENT 1 August 5, 2006 19:01
CV flux correction in SIMPLE Sophie Main CFD Forum 2 April 25, 2002 03:21
total mass flux correction for compressible fluid? Francesco Di Maio Main CFD Forum 0 August 21, 2000 04:23

All times are GMT -4. The time now is 14:59.