|
[Sponsors] |
May 14, 2010, 12:08 |
local time stepping in OF
|
#1 |
Senior Member
KGN
Join Date: Oct 2009
Location: Chennai, India
Posts: 121
Rep Power: 16 |
Hi all,
I want to simulate steady inviscid supersonic compressible flow problem. In OF1.6 no solver is available for the above problem. "rhoSonicFoam" a density based solver for inviscid transient flows, so speed up the convergence for steady state problems, local time stepping is a good approach. If someone have implemented the local time stepping, it can be posted in the forum or someone can given an idea to implement the local time stepping thanks mecbe |
|
May 15, 2010, 12:05 |
CoEuler
|
#2 |
Member
Michael Roth
Join Date: Mar 2009
Location: Guelph, Ontario, Canada
Posts: 50
Rep Power: 17 |
You might try CoEuler which adjusts the local timestep to maintain Courant below a specified level to accelerate convergence to steady state:
Code:
ddtSchemes { // default backward; default CoEuler phi maxCo 0.5; } |
|
May 19, 2010, 03:52 |
|
#3 |
Senior Member
KGN
Join Date: Oct 2009
Location: Chennai, India
Posts: 121
Rep Power: 16 |
Hi Mike,
I tried the CoEuler ddt scheme. But i have one question. CoEuler maintains the local Courant number to the specified value, so how to decide the time step value, that to be specified in controlDict file. say for eg. i set ddt scheme as CoEuler phi maxCo 0.8; minimum mesh size - 2e-3m, velocity U - 858 m/s, velocity of sound c - 343 m/s, so for Courant No - 1, Global deltaT = 1.6653e-6. So what time step value to specify in the controlDict file for the above condition. thanks mecbe |
|
|
|
Similar Threads | ||||
Thread | Thread Starter | Forum | Replies | Last Post |
SimpleFoam k and epsilon bounded | nedved | OpenFOAM Running, Solving & CFD | 16 | March 4, 2017 08:30 |
Dynamic moving mesh | Pei-Ying Hsieh (Hsieh) | OpenFOAM Running, Solving & CFD | 64 | June 7, 2012 10:04 |
IcoTopoFoam case is aborted | deepblue17 | OpenFOAM Running, Solving & CFD | 25 | December 2, 2010 14:20 |
[blockMesh] BlockMeshmergePatchPairs | hjasak | OpenFOAM Meshing & Mesh Conversion | 11 | August 15, 2008 07:36 |
Info on local time stepping | Frank Muldoon | Main CFD Forum | 1 | October 9, 1998 07:44 |