CFD Online Logo CFD Online URL
Home > Forums > Software User Forums > ANSYS > FLUENT

Vortex generators using fluent

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

LinkBack Thread Tools Display Modes
Old   July 21, 2013, 09:52
Default Vortex generators using fluent
New Member
Join Date: Dec 2011
Posts: 4
Rep Power: 8
Hardeep is on a distinguished road
Hi guys,

Im fairly new to CFD. I've been trying to model a triangular vortex generator (VG) placed on a baseboard in the middle of a flow to study the streamwise vortex at various VG angles using fluent. So far ive been using the SST k-w model which has been performing well and giving me good convergence. Im using SIMPLE coupling and second order methods and converging down to 1e-5.

This is mirroring an experimentation that is still being carried out so i do not have experimental data as yet to validate my simulations. Do you experts out there think SST k-w is suitable for vortex simulation? or are there any other parameters i can change to enhance this?

RSM or LES is out of the question for me. I've also tried RNG k-epsilon which has been giving me very bad convergence issues even though standard k-epsilon performs well. Im using snappyHexMesh for my meshing and have high density around and downstream of the VG.

Any advice would be much appreciated. Thanks in advance for help! i wouldn't have even got this far if it wasn't for this site!!

Hardeep is offline   Reply With Quote

Old   July 22, 2013, 06:16
New Member
Join Date: Dec 2011
Posts: 4
Rep Power: 8
Hardeep is on a distinguished road
I have since tried the Realizable k-epsilon model and the results look good. The vortex is far less diffused compared to standard k-e, and quite close to what im getting with SST k-w, with the added advantage that it converges in half the time. I'm now really interested to try the RNG k-e model as i know it's suited to swirling flows. Any ideas why the RNG model is not converging when all other models converge well?? The continuity residual just flat lines at 1e-2 and k oscillates sharply. I'm using the same mesh for all of them with approx. 6m cells and 30<y+<300.

Please any advice/thoughts would be appreciated! Thank you
Hardeep 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
How to open Icem mesh in Ansys Fluent? emmkell FLUENT 27 February 6, 2018 04:34
Two questions on Fluent UDF Steven Fluent UDF and Scheme Programming 4 September 20, 2013 16:30
Error in reading Fluent 13 case file in fluent 12 apurv FLUENT 2 July 12, 2013 07:46
Fluent 6.3 32bit vs Fluent 12.0 64bit ibex7 FLUENT 7 April 18, 2011 02:44
Vortex Generators Ben Cho FLUENT 1 May 5, 2006 00:59

All times are GMT -4. The time now is 23:39.