|
[Sponsors] |
March 26, 2010, 20:37 |
Reverse flow on a Presure outlet
|
#1 |
New Member
alberto
Join Date: Aug 2009
Posts: 7
Rep Power: 16 |
Hey guys
I'm teying to run a simulation of a wing and i made a growth function mesh on it, when i go to fluent there is a msg of a reverse flow on the pressure outlet face. Can some one tell me how to simulate it or how could i mesh the wing in order to get the best results.? P.S. I'm using Gambit to mesh it. |
|
March 27, 2010, 05:25 |
|
#2 |
Senior Member
Sebastian Gatzka
Join Date: Mar 2009
Location: Frankfurt, Germany
Posts: 729
Rep Power: 20 |
There is a good tutorial of an airfoil.
Well, it's not a wing, but you will get a good overview whats important so such an external flow.
__________________
Schrödingers wife: "What did you do to the cat? It's half dead!" |
|
March 27, 2010, 07:11 |
|
#3 |
Senior Member
karine
Join Date: Nov 2009
Posts: 158
Rep Power: 16 |
Hi
it is not a problem if u get a reversed flow.... Tell us more about ure outlet position: is it enough far from the wing???? do u have any vortex schedding??? |
|
March 27, 2010, 12:06 |
|
#4 |
New Member
alberto
Join Date: Aug 2009
Posts: 7
Rep Power: 16 |
Well the outlet is far enough i think, the thing is that the results that are coming out are not good at all... is good to tell you guys this is a 3D wing.
p.s. thanx for your help. |
|
March 29, 2010, 04:49 |
|
#5 |
Senior Member
karine
Join Date: Nov 2009
Posts: 158
Rep Power: 16 |
well, i dont think the problem is the reverse flow on the pressure outlet ...
are u using steady or unsteady solver?????? wich turbulence model????? wich near wall treatment ?did u verify convergence???? do u have vortex schedding ???? what do u got as results? |
|
March 29, 2010, 19:58 |
|
#6 |
New Member
alberto
Join Date: Aug 2009
Posts: 7
Rep Power: 16 |
Well I'm using a Pressure Based, steady flow solver, I changed the operating conditions turn on the spalart allmaras viscuos model, and i also changed my convergence to 1E-6.
And my results are negative lift negative drag and a moment that is really out of order... if you have any idea of how I can improove my simulating Ill be realy thankfull. PS. I changed the reference values the area and the temp. |
|
April 1, 2010, 19:09 |
|
#7 |
Senior Member
karine
Join Date: Nov 2009
Posts: 158
Rep Power: 16 |
ure residuals have gone under 10-6????
if yes, i suggest that u use unsteady solver and that u average results then. |
|
April 2, 2010, 09:54 |
hi
|
#8 |
Member
heidar jafarizadeh
Join Date: Mar 2010
Location: Iran- Tehran
Posts: 43
Rep Power: 16 |
do u have any problem by the reverse flow?
do u have any divergence in residuals? if u have not any problem by above-mentioned please go on and don't wait. in the end boundary u may have some real reverse flow and tiny circulation zone. have u? |
|
Thread Tools | Search this Thread |
Display Modes | |
|
|
Similar Threads | ||||
Thread | Thread Starter | Forum | Replies | Last Post |
CAN'T CONVERGE WITH REVERSE FLOW AT OUTLET! | XIAOYI LI | FLUENT | 11 | September 14, 2012 17:43 |
mass flow outlet??? | davy | FLUENT | 2 | August 18, 2010 08:18 |
reverse flow | P.R.Naren | FLUENT | 5 | May 19, 2005 02:15 |
Define outlet with varying flow reistance in CFX | Coriolius | CFX | 1 | October 29, 2004 18:31 |
Terrible Mistake In Fluid Dynamics History | Abhi | Main CFD Forum | 12 | July 8, 2002 10:11 |