View Issue Details
ID | Project | Category | View Status | Date Submitted | Last Update |
---|---|---|---|---|---|
0001451 | OpenFOAM | Bug | public | 2014-12-04 15:45 | 2014-12-28 14:38 |
Reporter | joegi | Assigned To | henry | ||
Priority | normal | Severity | minor | Reproducibility | always |
Status | closed | Resolution | no change required | ||
Platform | linux | OS | opensuse | OS Version | 12.3 |
Summary | 0001451: Pressure stair-step behaviour using rhopimplefoam | ||||
Description | Hi, I don't know if this properly classifies as a bug, but I am having an strange stair-step behavior on the pressure when using rhopimplefoam. The case consists of a simple straight pipe (Poiseuille case, so we have an analytical solution). I am computing the solution using icoFoam, pimpleFoam, and rhoPimpleFoam for the same mesh, physical properties, and same boundary conditions. The peak velocity is about 2.8 m/s, so I expect rhoPimpleFoam to yield to the same results as those of the incompressible solvers. While the velocity is pretty much the same, the pressure along the pipe axis of rhoPimpleFoam shows a stair-step (wiggles) behavior, whereas the pressure reported by the incompressible solvers has a smooth behavior (as expected and desired). At this point, I wonder if you have seen this behavior. I have used many different numerical schemes and I always see the same behavior. Using finer meshes did not yield to better results. By the way, I see the same behavior using the Heat transfer and buoyancy-driven flows solvers. | ||||
Steps To Reproduce | Run: Go to rp5: blockMesh -dict system/blockMeshDict rhoPimpleFoam sample -latestTime Then go to pimple: blockMesh pimpleFoam sample -latestTime Then compare the solutions for both cases (pressure). | ||||
Tags | No tags attached. | ||||
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The last figure is a comparison between fluent and openfoam. Using same BC, IC and numerical method. |
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Try to increase the write precision ;-) |
Date Modified | Username | Field | Change |
---|---|---|---|
2014-12-04 15:45 | joegi | New Issue | |
2014-12-04 15:45 | joegi | File Added: pimple.tar.gz | |
2014-12-04 15:50 | joegi | File Added: f1.png | |
2014-12-04 15:51 | joegi | File Added: f2.png | |
2014-12-04 15:51 | joegi | File Added: f3.png | |
2014-12-04 16:39 | joegi | File Added: f4.png | |
2014-12-04 16:40 | joegi | Note Added: 0003298 | |
2014-12-14 22:10 | dhora | Note Added: 0003318 | |
2014-12-28 14:38 | henry | Status | new => closed |
2014-12-28 14:38 | henry | Assigned To | => henry |
2014-12-28 14:38 | henry | Resolution | open => no change required |