View Issue Details
| ID | Project | Category | View Status | Date Submitted | Last Update |
|---|---|---|---|---|---|
| 0000792 | OpenFOAM | Bug | public | 2013-03-19 20:36 | 2013-03-19 22:48 |
| Reporter | alundilong | Assigned To | henry | ||
| Priority | high | Severity | major | Reproducibility | always |
| Status | resolved | Resolution | no change required | ||
| Platform | Ubuntu 12.04 | OS | Linux | OS Version | 12.04 |
| Summary | 0000792: relative error between serial and parallel is huge | ||||
| Description | Hi, I'm trying to solve a fluid dynamics problem in a very small domain with icoFoam. My test show that icoFoam shows very different results if run serially and parallel. The attached are three cases I used to test icoFoam and a modified solver I used to test the those cases. | ||||
| Steps To Reproduce | 1. Please download the compressed file 2. compile the solver source code 3. run the case through Allrun gMax/gMin functions are used to get the maximum/minimum velocity magnitude across the entire domain. You can see the max/min U are quite different between each cases from the screen. | ||||
| Tags | No tags attached. | ||||
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Try running the case in the latest version of OpenFOAM-2.2.x |
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Hi henry, thank you for your quick reply. I just tried it on OpenFOAM-2.2.x, but still got big difference between each case. |
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When I run icoFoam on your cases I get exactly 0 velocity in both serial and parallel mode. |
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I checked the weired icoFoam.C you sent with the case and manipulating U.oldTime() in this manner makes no physical sense and the code is clearly diverging rapidly. The velocities are different in serial and parallel because the rate of divergence of the solver is different between serial and parallel. |
| Date Modified | Username | Field | Change |
|---|---|---|---|
| 2013-03-19 20:36 | alundilong | New Issue | |
| 2013-03-19 20:36 | alundilong | File Added: testIcoFoam.tar.bz2 | |
| 2013-03-19 20:57 | henry | Note Added: 0002025 | |
| 2013-03-19 21:37 | alundilong | Note Added: 0002026 | |
| 2013-03-19 22:39 | henry | Note Added: 0002028 | |
| 2013-03-19 22:48 | henry | Note Added: 0002029 | |
| 2013-03-19 22:48 | henry | Status | new => resolved |
| 2013-03-19 22:48 | henry | Resolution | open => no change required |
| 2013-03-19 22:48 | henry | Assigned To | => henry |
