Unacceptable results using multiphaseEulerFoam

moz455 · April 22, 2021, 13:37

Hi,
I am working on simulating the pseudo-2d fluidized bed presented by Laverman et al. using the multiphaseEulerFoam solver. Although the time-averaged solid volume fractions are in an acceptable agreement with the literature data, the solid averaged velocity profile does not seem good. I have checked every thing in the settings but I cannot make it better. I appreciate if any experienced guy gives me some hint on this issue.
Cheers,
Mohsen

moz455 · April 23, 2021, 12:44

Is anyone who works with the multiphaseEulerFoam here?

HPE · April 23, 2021, 13:44

Hi,

Could you please provide a complete and minimal set of information, so that we can reproduce the issue, if possible?

I don't think any useful suggestion can be made based on the current problem description.

Some of the links below may help?

moz455 · April 23, 2021, 14:06

literature.png

my-results.png

file.zip
Thank you for your prompt response. I am working on the simulation of Laverman pseudo-2D fluidized bed. Unfortunately the averaged velocity in y direction is not in an acceptable agreement with the experimental data and the numerical results of the literature. I have attached my results and the literature results. Sorry for the bad format of my results. The averaged velocity unit in my chart is (m/s) while it is (cm/s) in the other plot. The averaged volume fraction is in acceptable agreement with the literature.

I am not sure what is wrong in my settings but I have checked everything and the input values are correct. I appreciate if you can guide me to solve this issue. I have spent a lot of time on it. The run files are also attached.

dscian · April 24, 2021, 00:55

I would change CarnahanStarling radial model to LunSavage and use a turbulence model for the air phase. Also, is your alphaMinFriction (0.6) from the literature?

moz455 · April 25, 2021, 13:19

Quote:

Originally Posted by dscian

I would change CarnahanStarling radial model to LunSavage and use a turbulence model for the air phase. Also, is your alphaMinFriction (0.6) from the literature?

Thank you ! Yes, it is 0.6 from he literature. I think changing the air flow regime to turbulence did not work. The deviation from the literature result is big. Have you ever validated the results of multiphaseEulerFoam?Do you think if I shoudl switch to version & from the version I am using now, version 8?

April 22, 2021, 13:37	Unacceptable results using multiphaseEulerFoam	#1
moz455 New Member Mohsen Zarepour Join Date: Feb 2021 Posts: 10 Rep Power: 5	Hi, I am working on simulating the pseudo-2d fluidized bed presented by Laverman et al. using the multiphaseEulerFoam solver. Although the time-averaged solid volume fractions are in an acceptable agreement with the literature data, the solid averaged velocity profile does not seem good. I have checked every thing in the settings but I cannot make it better. I appreciate if any experienced guy gives me some hint on this issue. Cheers, Mohsen

April 23, 2021, 13:44		#3
HPE Senior Member Herpes Free Engineer Join Date: Sep 2019 Location: The Home Under The Ground with the Lost Boys Posts: 932 Rep Power: 12	Hi, Could you please provide a complete and minimal set of information, so that we can reproduce the issue, if possible? I don't think any useful suggestion can be made based on the current problem description. Some of the links below may help? __________________ The OpenFOAM community is the biggest contributor to OpenFOAM: User guide/Wiki-1/Wiki-2/Code guide/Code Wiki/Journal Nilsson/Guerrero/Holzinger/Holzmann/Nagy/Santos/Nozaki/Jasak/Primer Governance Bugs/Features: OpenFOAM (ESI-OpenCFD-Trademark) Bugs/Features: FOAM-Extend (Wikki-FSB) Bugs: OpenFOAM.org How to create a MWE New: Forkable OpenFOAM mirror

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April 23, 2021, 12:44		#2
moz455 New Member Mohsen Zarepour Join Date: Feb 2021 Posts: 10 Rep Power: 5	Is anyone who works with the multiphaseEulerFoam here?

April 23, 2021, 14:06		#4
moz455 New Member Mohsen Zarepour Join Date: Feb 2021 Posts: 10 Rep Power: 5	literature.png my-results.png file.zip Thank you for your prompt response. I am working on the simulation of Laverman pseudo-2D fluidized bed. Unfortunately the averaged velocity in y direction is not in an acceptable agreement with the experimental data and the numerical results of the literature. I have attached my results and the literature results. Sorry for the bad format of my results. The averaged velocity unit in my chart is (m/s) while it is (cm/s) in the other plot. The averaged volume fraction is in acceptable agreement with the literature. I am not sure what is wrong in my settings but I have checked everything and the input values are correct. I appreciate if you can guide me to solve this issue. I have spent a lot of time on it. The run files are also attached.

April 24, 2021, 00:55		#5
dscian Member Utkan Caliskan Join Date: Aug 2014 Posts: 42 Rep Power: 11	I would change CarnahanStarling radial model to LunSavage and use a turbulence model for the air phase. Also, is your alphaMinFriction (0.6) from the literature?