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

Taylor Vortex and Accuracy

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

Reply
 
LinkBack Thread Tools Display Modes
Old   April 7, 2010, 22:59
Default Taylor Vortex and Accuracy
  #1
Member
 
ganesh
Join Date: Mar 2009
Posts: 40
Rep Power: 7
ganesh is on a distinguished road
Dear Friends,

I am working on developing an unstructured staggered grid based incompressible flow solver. In testing the solver for accuracy, I chose the Taylor-Green vortex problem at Re=100. For unstructured meshes at t=1 on very fine meshes I see that the errors in velocity fall at a rate close to 1. My convective discretisation uses a linear reconstruction and viscous discretisation is based on Blazek's procedure (ie. gradient at face is average of gradients in cells sharing the face + a correction term to avoid odd-even decoupling). Has anyone tested this problem (not in the inviscid limit, but that is also fine) on 2D unstructured meshes for accuracy ? Is it possible to get more details if this is the case.

P.S.: I get a second order accuracy in global velocity error on structured meshes, so that is fine. Also for a steady state problem (with an exact solution at Re=100, different problem not the Taylor vortex), unstructured meshes give me close to 1.8 in the error fall rate

Thanks and Regards,

Ganesh
ganesh 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
Fluent accuracy and boundary conditions Paolo Lampitella FLUENT 0 June 12, 2008 06:25
Temporal accuracy ganesh Main CFD Forum 0 February 29, 2008 05:32
accuracy of Discontinuous Galerkin Qu Kun Main CFD Forum 0 September 6, 2004 09:19
Grid size and VOF accuracy Ryan FLUENT 2 May 10, 2004 07:59
time accuracy test nat Main CFD Forum 0 April 1, 2003 22:24


All times are GMT -4. The time now is 11:22.