|
[Sponsors] |
Simulation with turbulence modelling converges but laminar simulation does not |
|
LinkBack | Thread Tools | Search this Thread | Display Modes |
December 29, 2023, 12:06 |
Simulation with turbulence modelling converges but laminar simulation does not
|
#1 |
New Member
Timothy
Join Date: Feb 2023
Posts: 4
Rep Power: 3 |
Hi,
I've been trying to run a 2D single-phase simulation on a relatively simple geometry using Simplefoam. Convergence can be arrived at when I incorporate the use of the k-epsilon turbulence model, whether turbulence is turned on or off in the turbulenceProperties file, but when no turbulence model is used, I either run into a floating point exception or the residuals oscillate and fail to fall to the desired level. The geometry is here: https://imgur.com/a/ErOuaUP The boundary conditions for U are:
The case folder is here: https://drive.google.com/drive/folde...usp=drive_link I have tried changing the mesh resolution, reducing the timestep, changing to a fixedvalue pressure outlet BC, and decreasing the inlet velocity to lower the Reynolds number of the ingoing flow but to no avail. I would appreciate any advice or guidance regarding this. Thank you |
|
January 7, 2024, 10:34 |
|
#2 | |
Senior Member
Saeed Jamshidi
Join Date: Aug 2019
Posts: 214
Rep Power: 8 |
Quote:
Please try this: Code:
relaxationFactors { fields { p 0.3; } equations { U 0.7; } } |
||
January 11, 2024, 14:29 |
|
#3 |
New Member
Timothy
Join Date: Feb 2023
Posts: 4
Rep Power: 3 |
Thanks. Decreasing the relaxation factors by itself didn't work, but lowering the velocity and characteristic length until the flow regime was laminar (Re=2000), together with lowering the relaxation factors, worked
|
|
|
|
Similar Threads | ||||
Thread | Thread Starter | Forum | Replies | Last Post |
Laminar simulation of turbulent interfoam tutorial case doesn't finish | finn_amann | OpenFOAM Running, Solving & CFD | 0 | May 6, 2022 10:03 |
Low Re Turbulence model VS Low Re flow and Turbulence Modelling background | pchoopanya | Main CFD Forum | 4 | May 10, 2018 12:05 |
Flow Around a Cricket Ball - Turbulence Modelling Approaches? | Brock17 | Main CFD Forum | 0 | April 10, 2017 09:21 |
Turbulence modelling for bubble column in twoPhaseEulerFoam | hester | OpenFOAM Running, Solving & CFD | 2 | February 10, 2015 12:42 |
Turbulence Intensity Vs CFD Simulation | Apple L S Chan | Main CFD Forum | 3 | December 15, 1998 18:28 |