|
[Sponsors] |
![]() |
![]() |
#1 |
Senior Member
Saeed Jamshidi
Join Date: Aug 2019
Posts: 214
Rep Power: 8 ![]() |
Hello,
I have a question regarding performance of openfoam and fluent in simulating of fluid flow. Why these tools give us different time scales?! For instance, consider laminar flow over a cylinder at Re=100; simulation reaches to the consistency after 200 seconds by openfoam, whereas it is 20 seconds for the same case by fluent! Regards |
|
![]() |
![]() |
![]() |
![]() |
#2 |
Senior Member
Join Date: Apr 2020
Location: UK
Posts: 711
Rep Power: 14 ![]() |
... because you set the simulations up differently. They are both solving the same physics.
|
|
![]() |
![]() |
![]() |
![]() |
#3 |
Senior Member
Saeed Jamshidi
Join Date: Aug 2019
Posts: 214
Rep Power: 8 ![]() |
Tobermory، thank for the reply.
Your response doesn't deliver any information on to me😅 Would you like to go a little bit in details?! |
|
![]() |
![]() |
![]() |
![]() |
#4 |
Senior Member
Join Date: Apr 2020
Location: UK
Posts: 711
Rep Power: 14 ![]() |
Haha - well, to be fair, you didn't supply any details either! And also
1. what do you mean by "reaches to the consistency" 2. are the times you quote simulation times or wall-clock times? There are then countless questions that follow on: what numerical schemes did you employ? are the boundary conditions and mesh identical? steady state or transient? if transient, are the time steps the same? etc etc etc. For us to help, you need to narrow down your question. |
|
![]() |
![]() |
![]() |
![]() |
#5 |
Senior Member
Saeed Jamshidi
Join Date: Aug 2019
Posts: 214
Rep Power: 8 ![]() |
Yeap, you are right 👍.
All of the conditions are similar, numerical scheme, solver and it is transient problem. Actually, a simple case, laminar 2D flow past a cylinder with the same mesh. I'v just noticed about significant difference between time scale in openfoam and fluent. Best |
|
![]() |
![]() |
![]() |
|
|
![]() |
||||
Thread | Thread Starter | Forum | Replies | Last Post |
how to run fluent from matlab without using aas toolbox? | artemis96 | ANSYS | 7 | May 23, 2022 12:16 |
[Commercial meshers] Mesh conversion from Ansys Fluent 2021 R1 .msh to OpenFOAM is not working | parthigcar | OpenFOAM Meshing & Mesh Conversion | 4 | June 4, 2021 02:04 |
ANSYS fluent and OpenFoAM comparison | gentodin | Main CFD Forum | 6 | February 26, 2021 03:58 |
[Commercial meshers] Error by importing .msh format to openfoam | shengqiming | OpenFOAM Meshing & Mesh Conversion | 2 | August 24, 2016 06:38 |
Fluent elbow in Openfoam | chemeng | OpenFOAM | 1 | January 21, 2010 03:52 |