|
[Sponsors] |
![]() |
![]() |
#1 |
New Member
Muhammad Rizwan
Join Date: Mar 2020
Posts: 11
Rep Power: 6 ![]() |
I am trying to perform a ventilation analysis of a tunnel with a source of fire inside it. I used the k epsilon and k omega SST for turbulence. Can please someone tell me the reason for this issue?k omegaSST.jpg
k epsilon.jpg |
|
![]() |
![]() |
![]() |
![]() |
#2 |
Senior Member
|
The residuals are not oscillating. You are running a transient case and the residuals are supposed to drop from rather high values to low values within each time-step. That's what you are observing.
__________________
Regards, Vinerm PM to be used if and only if you do not want something to be shared publicly. PM is considered to be of the least priority. |
|
![]() |
![]() |
![]() |
![]() |
#3 |
New Member
Muhammad Rizwan
Join Date: Mar 2020
Posts: 11
Rep Power: 6 ![]() |
Understood. For a transient simulation I get peaks and troughs as it reaches convergence. But sometimes the trend of the oscillations are increasing in amplitude. And how can one judge the solution and say that the solution is converged?
|
|
![]() |
![]() |
![]() |
![]() |
#4 |
Senior Member
|
Set up a few monitor points, such as, pressure, velocity, temperature, etc., at some boundaries. These should either achieve a constant value or a periodic oscillation in the value.
__________________
Regards, Vinerm PM to be used if and only if you do not want something to be shared publicly. PM is considered to be of the least priority. |
|
![]() |
![]() |
![]() |
Tags |
residuals |
|
|
![]() |
||||
Thread | Thread Starter | Forum | Replies | Last Post |
Oscillating residuals in steady flow problem | Mohit Singh | Main CFD Forum | 3 | February 23, 2016 15:39 |
Reason for oscillating residuals | fayaazhussain | Main CFD Forum | 3 | August 21, 2014 11:31 |
Oscillating residuals and no convergence! | Sherlock_1812 | OpenFOAM Running, Solving & CFD | 7 | August 20, 2014 10:39 |
Solution not converging, but oscillating residuals around a constant value | Irene | FLUENT | 2 | February 7, 2012 12:55 |
Oscillating Residuals in Finer Mesh Case | Jake | FLUENT | 3 | June 16, 2005 10:34 |