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

MUSCL shock capturing on high aspect ratio meshes

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

LinkBack Thread Tools Search this Thread Display Modes
Old   September 28, 2012, 14:21
Default MUSCL shock capturing on high aspect ratio meshes
New Member
Vijay Paul
Join Date: May 2011
Posts: 4
Rep Power: 13
vijay_paul is on a distinguished road
I have noticed that MUSCL generates oscillations (non-monotone behavior) behind oblique shocks if the mesh aspect ratio is high. The problem does not seem to occur near walls where structured meshes have very high aspect ratios. There are situations like backward facing step problem where downstream of the corner, mesh is highly anisotropic. If the shock is at an angle of 45 degrees and aspect ratio is 10, then shock will be 2-3 points wide in one direction and 20-30 points in the other. When the limiter tries to sharpen the shock front in latter direction, one ends with a stair case shaped shock and post shock oscillations. Any thoughts on this other than the simple suggestion of avoiding high anisotropy will be greatly appreciated.
vijay_paul is offline   Reply With Quote

Old   September 29, 2012, 00:16
Super Moderator
Praveen. C
Join Date: Mar 2009
Location: Bangalore
Posts: 342
Blog Entries: 6
Rep Power: 16
praveen is on a distinguished road
Your mesh is not able to resolve the shock. There is not much that can be done in this case, other than to adapt your mesh.

Using a higher order method like weno might help to some extent.
praveen is offline   Reply With Quote


mesh anisotropy, muscl, non-monotone oscillations

Thread Tools Search this Thread
Search this Thread:

Advanced Search
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 Off
Pingbacks are On
Refbacks are On

Similar Threads
Thread Thread Starter Forum Replies Last Post
[ICEM] check aspect ratio camoesas ANSYS Meshing & Geometry 2 November 14, 2011 09:38
[ICEM] Mesh along axis for a wedge gives elements with extreme aspect ratio sangrampp ANSYS Meshing & Geometry 0 November 17, 2010 06:57
flow with high turbulent viscosity ratio Phillips Main CFD Forum 2 August 25, 2008 18:01
High aspect ratio in viscous sublayer? Marius Main CFD Forum 0 December 22, 2005 08:15
high aspect ratio elements Olivier CFX 5 April 3, 2003 06:55

All times are GMT -4. The time now is 09:19.