View Issue Details
ID | Project | Category | View Status | Date Submitted | Last Update |
---|---|---|---|---|---|
0002986 | OpenFOAM | Bug | public | 2018-06-19 09:26 | 2018-06-26 21:04 |
Reporter | HTauber | Assigned To | henry | ||
Priority | normal | Severity | minor | Reproducibility | always |
Status | closed | Resolution | no change required | ||
Platform | GNU/Linux | OS | Ubuntu | OS Version | 16.04 |
Product Version | dev | ||||
Summary | 0002986: compressible::turbulentTemperatureRadCoupledMixed runs unstable | ||||
Description | In the enclosed sample are two regions (air and solid). The left wall of the region "air) has a temperature of 500 K and radiates heat to the opposite wall "air_to_solid". The mapped wall "air_to_solid" has an additional layer (thickness=0.025, kappa=0.25). The emissivities of the walls are set to 1.0. When you reduce the value of kappa to 0.2 the calculated wall temperature of "air_to_solid" begins to fluctuate. When you still further reduce the value of kappa to 0.1 you get an error. This problem doesn't occur if layers are excluded or radiation is off. | ||||
Steps To Reproduce | Enclosed you will find an attached case. | ||||
Tags | No tags attached. | ||||
|
|
|
Have you tried relaxation and increasing the number of PIMPLE iterations? |
|
Now I have set kappa to 0.1 and relaxationFactor in fvSolution to 0.3, but the wall temperature of "air_to_solid" doesn't converge. The PIMPLE iterations (do you mean nCorrectors?) has little effect on the calculation. When I make kappa smaller I get an error again. When I used the boundary condition "externalWallHeatFluxTemperature" I had the same problem, but setting the property "relaxation" to a lower value helped me to come to a convergence. |
|
You could try adding the kind of relaxation in the externalWallHeatFluxTemperature BC to the turbulentTemperatureRadCoupledMixed BC. |
|
Sorry, but I have not enough experience in programming with C++. |
|
This is a good opportunity to gain some experience by studying the existing code and making similar changes elsewhere. |
|
I will try, but I need some help. What is the first step? |
|
User support or development request, either way requires funding for the OpenFOAM Foundation: https://openfoam.org/news/funding-2018/ https://openfoam.org/maintenance/ |
Date Modified | Username | Field | Change |
---|---|---|---|
2018-06-19 09:26 | HTauber | New Issue | |
2018-06-19 09:26 | HTauber | File Added: case01.tar.gz | |
2018-06-19 13:50 | henry | Note Added: 0009797 | |
2018-06-20 07:21 | HTauber | Note Added: 0009803 | |
2018-06-20 08:12 | henry | Note Added: 0009804 | |
2018-06-20 13:06 | HTauber | Note Added: 0009806 | |
2018-06-20 14:06 | henry | Note Added: 0009807 | |
2018-06-20 14:22 | HTauber | Note Added: 0009808 | |
2018-06-26 21:04 | henry | Assigned To | => henry |
2018-06-26 21:04 | henry | Status | new => closed |
2018-06-26 21:04 | henry | Resolution | open => no change required |
2018-06-26 21:04 | henry | Note Added: 0009834 |