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Possible problem in cyclic boundary conditions in parallel cases |
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June 10, 2009, 01:48 |
Possible problem in cyclic boundary conditions in parallel cases
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Alberto Passalacqua
Join Date: Mar 2009
Location: Ames, Iowa, United States
Posts: 1,912
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Hello,
I was running a simple scalar transport problem in a periodic square (all 4 sides periodic), with a fixed sinusoidal velocity profile. The initial condition for the scalar is shown in the attachment Initial.png. Values are 0 and 1 at t = 0. If the case is run in serial mode, at t = 0.1, the result is shown in Serial.png, with the expected behaviour. However, when the case is split over two processors, at the same time, there are inconsistencies along the decomposition surface (vertical line in the middle of the domain. I used the "simple" decomposition in the pictures, however a similar problem is present with METIS too), where the concentration increases unexpectedly to 2 (See Parallel.png). Also, half of the periodic patch is affected. The blockMeshDict is attached for your convenience. Edit: OpenFOAM Version: 1.5.x from git repository, updated today. Best,
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Alberto Passalacqua GeekoCFD - A free distribution based on openSUSE 64 bit with CFD tools, including OpenFOAM. Available as in both physical and virtual formats (current status: http://albertopassalacqua.com/?p=1541) OpenQBMM - An open-source implementation of quadrature-based moment methods. To obtain more accurate answers, please specify the version of OpenFOAM you are using. Last edited by alberto; June 10, 2009 at 02:29. |
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