|
[Sponsors] |
Courant number is spiking in very small section |
|
LinkBack | Thread Tools | Search this Thread | Display Modes |
March 8, 2024, 02:20 |
Courant number is spiking in very small section
|
#1 |
Senior Member
Desh
Join Date: Mar 2021
Location: Sydney
Posts: 118
Rep Power: 5 |
Hi All,
I am running a venting event in 2D wedge domain with rhoPimpleFoam in OF10. Please see the attached figure. My fluid domain is roughly 0.7 m (height) x 0.1 m (radius) of a wedge. From the bottom surface of the wedge I've assigned my outlet. The question is solver is choosing very small time stepping (1E-9/10). Reason for this is only few cells Co no is reaching to 1 whilst all the rest remains under 1e-8 or so. My mesh is clean, and no errors at all.. How can I avoid this few cells Co being increased so I can increase my overall time stepping ? Any insights are highly appreciated. Thank you. Dasith |
|
March 8, 2024, 02:23 |
|
#2 |
Senior Member
Desh
Join Date: Mar 2021
Location: Sydney
Posts: 118
Rep Power: 5 |
Sorry forgot to attached the figure
|
|
March 8, 2024, 10:27 |
|
#3 |
Senior Member
Josh Williams
Join Date: Feb 2021
Location: Scotland
Posts: 113
Rep Power: 5 |
||
March 10, 2024, 18:12 |
|
#4 | |
Senior Member
Desh
Join Date: Mar 2021
Location: Sydney
Posts: 118
Rep Power: 5 |
Quote:
Hi, Thank you for your reply. Apologies for the misinterpretation of the problem. The mesh in the figure is only one iterations of me trying to avoid the Co spike. I tried simpleGrading to make the mesh for uniform/refine/course basically everything. Nothing works. However that boundry has a pressure gradient of delataP = 200MPa- 0.1MPa Following are the pressure and velocity boundary conditions I am using; PHP Code:
PHP Code:
Thank you |
||
Tags |
courant number |
Thread Tools | Search this Thread |
Display Modes | |
|
|
Similar Threads | ||||
Thread | Thread Starter | Forum | Replies | Last Post |
Foam::error::PrintStack | almir | OpenFOAM Running, Solving & CFD | 92 | May 21, 2024 08:56 |
Courant Number | waseeqsiddiqui | FLUENT | 3 | December 27, 2018 11:43 |
Inconsistencies in reading .dat file during run time in new injection model | Scram_1 | OpenFOAM | 0 | March 23, 2018 23:29 |
decomposePar -allRegions | stru | OpenFOAM Pre-Processing | 2 | August 25, 2015 04:58 |
[blockMesh] --> foam fatal error: | lillo763 | OpenFOAM Meshing & Mesh Conversion | 0 | March 5, 2014 11:27 |