|March 17, 2009, 23:37||
Comparison of different spatial and temporal discretization schemes
Join Date: Mar 2009
Location: Davis, CA, United States
Posts: 60Rep Power: 10
I am studying the behaviour of vortex shedding behind a cylinder/sphere and now I want to see how different discretization methods influence the resulting von Kármán street.
I worked with various other solver before in which one could define the order of the spatial and temporal discretisation in a fairly simple manner. But concerning OpenFOAM it seems one has a lot more choice to influence the behaviour of the solver.
I read both programmers ans users guide and decided, that the two important "schemes" to play around would be the timeScheme (of course) and the convection scheme (div).
That still leaves me with a lot of choices - which I am not capable of comparing all - so I would like to strip it down to useful comparisons.
Do you have any ideas or maybe even experience with the different schemes, then I would be happy to know about that. Something I never came across before is the property of "bounded" and "unbounded", maybe somebody could help me out with this?
Once I have decided on a test setup I will post the relevant data and results in this thread.
I will probably be starting with a square cylinder - as I have the grid and reference results for that one.
|March 18, 2009, 02:38||
Join Date: Mar 2009
Location: Ames, Iowa, United States
Posts: 1,910Rep Power: 28
for the time discretization:
For your case, as a starting point, you might try the backward scheme for time integration and the linear scheme for the convective term.
I hope this helps.
GeekoCFD - A free distribution based on openSUSE 64 bit with CFD tools, including OpenFOAM. Available as in both physical and virtual formats.
OpenQBMM - An open-source implementation of quadrature-based moment methods.
To obtain more accurate answers, please specify the version of OpenFOAM you are using.
|September 24, 2011, 12:15||
Join Date: May 2009
Location: Montreal, QC
Blog Entries: 1Rep Power: 15
Has any three-level method for temporal discretization been developed so far? I couldn't find it in either manual or src folder; it seems that many changes need because of using previous time step data for that, right?
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