View Issue Details
ID | Project | Category | View Status | Date Submitted | Last Update |
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0002969 | OpenFOAM | Bug | public | 2018-06-03 03:45 | 2018-06-03 10:01 |
Reporter | mpezhu | Assigned To | henry | ||
Priority | low | Severity | minor | Reproducibility | always |
Status | closed | Resolution | unable to reproduce | ||
Platform | GNU/Linux | OS | OpenSuSE | OS Version | 12.3 |
Summary | 0002969: particle dispersion in a pulverized coal combustion | ||||
Description | Hello, We are using coalChemistryFoam solver to simulate a pulverized coal combustion in a semi-industrial furnace with RAS. All the numerics are consistent with those in the tutorial files, i.e. system/ and constant/. As first test, we inject inert coal particles into the furnace, i.e. without gas phase combustion, devolatilization and char combustion, no radiation either. The OpenFOAM version is 2.3.0. However, for the spatial distribution of coal particles in the furnace. we found that the coal particles always disperse preferentially towards one direction (y direction, one of the spanwise direction) at some streamwise locations. This furnace can be viewed as being symmetric. Therefore, we expect that the distributions of the coal particles should be symmetric as well. No physical mechanisms can support this kind of asymmetry. We add the gravity accerleration as (0 -9.81 0), but we do not think this is the source of the problem. We guess this may be related to the "dispersionModel" for coal particles. We always use "stochasticDispersionRAS", same as that used in the tutorial. However, when I read the code for the dispersion models, I did not find any problem for it. Also, the gas phase velocity is normal and correct. I attached some figures and coalCloud1Properties file in this thread. Could you please give some comments about this issue? Thanks a lot! | ||||
Tags | No tags attached. | ||||
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we also tried another dispersion model "gradientDispersionRAS", but the results are almost similar. However, when we use "none" for the dispersion model, the particle shows very limited dispersion and always goes along the central gas stream. |
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> The OpenFOAM version is 2.3.0. You will need start by upgrading to OpenFOAM-5.x or better OpenFOAM-dev. |
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Thanks! I have compared the source files "stochasticDispersionRAS.C" in OF2.3.0 and 5.0. The biggest difference is how to predict the directional vector dir. So this is the problem? Can we implement the same way for dir prediction in 2.3.0 as that in 5.0? Thanks. |
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We provide support for the latest versions of OpenFOAM, please upgrade to OpenFOAM-5.x or OpenFOAM-dev and the follow the bug reporting rules: https://bugs.openfoam.org/rules.php |
Date Modified | Username | Field | Change |
---|---|---|---|
2018-06-03 03:45 | mpezhu | New Issue | |
2018-06-03 03:45 | mpezhu | File Added: figure.zip | |
2018-06-03 04:00 | mpezhu | Note Added: 0009694 | |
2018-06-03 09:42 | henry | Note Added: 0009695 | |
2018-06-03 09:43 | henry | Priority | high => low |
2018-06-03 09:43 | henry | Severity | major => minor |
2018-06-03 09:49 | mpezhu | Note Added: 0009696 | |
2018-06-03 10:01 | henry | Note Added: 0009697 | |
2018-06-03 10:01 | henry | Assigned To | => henry |
2018-06-03 10:01 | henry | Status | new => closed |
2018-06-03 10:01 | henry | Resolution | open => unable to reproduce |