View Issue Details
ID | Project | Category | View Status | Date Submitted | Last Update |
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0000936 | OpenFOAM | Bug | public | 2013-07-31 00:08 | 2013-07-31 14:46 |
Reporter | jherb | Assigned To | henry | ||
Priority | normal | Severity | major | Reproducibility | always |
Status | closed | Resolution | no change required | ||
Platform | Linux | OS | OpenSuse | OS Version | 11.1 |
Summary | 0000936: buoyantPimpleFoam calculates non-physical thick boundary layers and velociities in pipe | ||||
Description | The attached simple test case for a (2D) pipe flow simulated with buoyantPimpleFoam results in non-physical thick boundary layers at the walls and therefore in a (much) to high central velocity in the pipe. Using buoyantSimpleFoam to simulate the same case shows results as expected. (Using the stationary result as initialization for the transient calculation does not help.) (Doubling the number elements in the radial direction does not help either.) | ||||
Tags | No tags attached. | ||||
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There are many issues with the setup of your case, in particular the boundary condicions are not completely consistent and physical which is why you get recirculation from the outlet. Also many solver settings are far from optimal. Even with all the BCs and solver settings optimised it is still a difficult case because the pressure level is VERY large compared to the pressure variation and the density is set to be constant which make the problem very stiff. Nevertheless it is possible to get it running and provide the correct result. Due to the inconsistent initialisation of p and p_rgh the statement // Force p_rgh to be consistent with p p_rgh = p - rho*gh; in createFields.H has a detrimental effect on the start-up of the case and givin the initial field for p_rgh should be uniform it is better not to include this statement. For cases where p is correct and p_rgh is not it is better to include this statement. We will consider better initialisation options. We can help you correct this case and any others via a support contract. |
Date Modified | Username | Field | Change |
---|---|---|---|
2013-07-31 00:08 | jherb | New Issue | |
2013-07-31 00:08 | jherb | File Added: buoyantPimpleReport-130731.tar.gz | |
2013-07-31 09:23 | jherb | File Added: simple.png | |
2013-07-31 09:23 | jherb | File Added: pimple-2.00s.png | |
2013-07-31 14:46 | henry | Note Added: 0002358 | |
2013-07-31 14:46 | henry | Status | new => closed |
2013-07-31 14:46 | henry | Assigned To | => henry |
2013-07-31 14:46 | henry | Resolution | open => no change required |