View Issue Details
| ID | Project | Category | View Status | Date Submitted | Last Update |
|---|---|---|---|---|---|
| 0002185 | OpenFOAM | Bug | public | 2016-08-09 10:36 | 2016-10-02 19:51 |
| Reporter | Joris.C | Assigned To | wyldckat | ||
| Priority | normal | Severity | minor | Reproducibility | always |
| Status | closed | Resolution | no change required | ||
| Platform | Unix | OS | Other | OS Version | (please specify) |
| Summary | 0002185: fvDoM: time-dependent boundary temperature gives erroneous results | ||||
| Description | When having a time-dependent boundary temperature, the results of the fvDoM are skewed by the previous BC temperature. I have tested this with the square enclosure case, no conduction and no convection. A more extensive description of the case is in the first post of: http://www.cfd-online.com/Forums/openfoam-solving/122297-simple-radiation-validation-problem.html In my case specifically, the bottom and top walls are not taking part in the radiation procedure (0 emissivity and absorption), but this should not matter. The left and right walls are called Inlet and Outlet in this case. The temperature at the Outlet is 200 K at t=0-200 and changes to 0 K at t=200-400. (The case is set to run 200s and write the results, so it has to be executed twice; mesh is already present) Running sh postProcess.sh shows the radiation balance and input for the relevant surfaces. What is to be expected (see CFD online post for the calculation) Qr from the left wall/Inlet: 5.67 W/m2 Qr into right wall/Outlet: 2.3474 W/m2 | ||||
| Steps To Reproduce | chtMultiRegionFoam chtMultiRegionFoam sh postProcess.sh | ||||
| Additional Information | Case set-up similar to issue http://bugs.openfoam.org/view.php?id=2182, but BC's here are time-dependent, cacheDiv is true and postprocessing is done for OF4. However, the fvDoM model should not differ in these OF versions. | ||||
| Tags | No tags attached. | ||||
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I've taken a quick look into the attached case "radiationTest_v4.zip" and I have to say that I'm a bit confused, given that the description given does not match the case set-up: - a single execution of the solver should be enough, since there is an oscillating temperature; - the case is set-up to run 10000s, writing every 800s, therefore it's not configured for testing a 200s periods. And since the comments and concluding bug fix at http://bugs.openfoam.org/view.php?id=2182 - indicate that "cacheDiv" should be set to "false" in order for the calculations to work as intended. Therefore, I'll be closing this report as "no change required", given that there is a high probability that this was already solved in issue #2182. @Joris.C: If this issue still stands with the latest OpenFOAM-dev builds, then please re-open this report and provide a test case that works with OpenFOAM-dev, along with instructions on how to use said case. If you are using Ubuntu, you can quickly install OpenFOAM-dev using the recent Deb packages for Ubuntu, as detailed here: http://openfoam.org/download/dev-ubuntu/ |
| Date Modified | Username | Field | Change |
|---|---|---|---|
| 2016-08-09 10:36 | Joris.C | New Issue | |
| 2016-08-09 10:36 | Joris.C | File Added: radiationTest_v4.zip | |
| 2016-10-02 19:51 | wyldckat | Note Added: 0006951 | |
| 2016-10-02 19:51 | wyldckat | Assigned To | => wyldckat |
| 2016-10-02 19:51 | wyldckat | Status | new => closed |
| 2016-10-02 19:51 | wyldckat | Resolution | open => no change required |
