|
[Sponsors] |
July 21, 2013, 10:52 |
Vortex generators using fluent
|
#1 |
New Member
Hardeep
Join Date: Dec 2011
Posts: 4
Rep Power: 15 |
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 |
|
July 22, 2013, 07:16 |
|
#2 |
New Member
Hardeep
Join Date: Dec 2011
Posts: 4
Rep Power: 15 |
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 |
|
|
|
Similar Threads | ||||
Thread | Thread Starter | Forum | Replies | Last Post |
Two questions on Fluent UDF | Steven | Fluent UDF and Scheme Programming | 7 | March 23, 2018 04:22 |
How to open Icem mesh in Ansys Fluent? | emmkell | FLUENT | 27 | February 6, 2018 04:34 |
Error in reading Fluent 13 case file in fluent 12 | apurv | FLUENT | 2 | July 12, 2013 08:46 |
Fluent 6.3 32bit vs Fluent 12.0 64bit | ibex7 | FLUENT | 7 | April 18, 2011 03:44 |
Vortex Generators | Ben Cho | FLUENT | 1 | May 5, 2006 01:59 |