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particle time-step in DPMFoam

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Old   October 27, 2015, 23:14
Default particle time-step in DPMFoam
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Shuai Wang
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Hi,
I use DPMFoam to simulate gas-solid flow in a CFB riser, particle number is 201000 with diameter 185um, density 2400kg/m3. The wide-depth-height of the geometry is 32mm-1.2mm-300mm with grids of 64-3-600. However, I have some questions about the solver DPMFoam.
1. How to determine particle time-step in DPMFoam, I can't find this parameter.
2. In my work, I use 16 processors and find the simulation so slow. I want to know if anyone who utilized DPMFoam to simulate gas-solid flow with or more than 200000 particles?
3. The difference of detection algorithm of particle collisions between in DPMFoam and in CFDEM? Which is the better?
Thank you!

Wang
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Old   November 5, 2015, 17:58
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Jesus Ramirez
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I was wondering that somebody was working with DPMFoam right now. I have the same doubts and indeed I would like to know if you know which method is implemented in DPMFoam for tracking particles. is it the lagrangian Particle Source in Cell method (PSC)? or the MP-PSC? or an eulerian approach?.

Thank you.
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Old   November 6, 2015, 08:52
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Ananda Kannan
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Hi jarpve!!

From what i know, DPMFoam using lagrangian particle source in cell method.. however its not that straightforward as not all of the 'particulate phase forces' can be directly added as a source in-cell.. what i mean to say is that both drag and buoyancy are dependent on velocity and hence cannot be treated a complete source... for more info read this..
http://www.openfoam.org/mantisbt/fil...=1030&type=bug

Regards
ansubru
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Old   November 6, 2015, 08:59
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Hi Wang!!

I am currently simulating around 150000 particles in my case study (an extension of a fluidized bed) and the case is quite fast... I havent paralellized my application as i use a self modified version of the DPMFOam solver (with capability to handle vibrating/moving walls) which has not been tuned to tackle MPI right now.. However in serial mode, i can simulate upto 5-6 secs (in 10 hrs)... Not the most efficient, but it works ... In my opinion DPMFoam can be tuned and altered much more than DEM solution's software.. If your simulation is slow, maybe your paralellization is'nt great.. sometimes its better to run the code in serial mode first to see if there are some 'numerical instabilities' leading to longer computational times,

Regards
ansubru
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Old   November 6, 2015, 09:03
Default DPMFoam DEM
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Shuai Wang
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Hi jarpve,
I validated the DPMFoam with experiments by Muller et al, the investigated object is a bubbling fluidized bed with 44mm width, 200mm heights and 10mm depth. The numerical results from DPMFoam showed good agreements with the experimental data. Collisions between particles are modeled used soft-sphere model, which is different from MP-PIC in software Barracuda (CPFD). I think DPMFoam is DEM method that likes CFDEM.

Regards
Wang
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Old   November 6, 2015, 09:13
Default parallelization performance of DPMFoam
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Shuai Wang
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Hi ansubru,
Frankly speaking, the parallelization performance of DPMFoam is not as good as CFDEM, I have tested it. In DPMFoam, particle number < 300000, grid number < 200000, I think it can be used as an alternative to other DEM solution’s software. However, when particle number increases, I don’t think DPMFoam is a good choice (Using same processors).
In fact, I want to combine DPMFoam with coalChemicalFoam to simulate coal/biomass gasification or combustion in fluidized beds, where particle collisions are modeled by DEM, I am doing this work just now.

Best regards
Wang
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Old   December 29, 2015, 11:52
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Jesus Ramirez
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Quote:
Originally Posted by ansubru View Post
Hi jarpve!!

From what i know, DPMFoam using lagrangian particle source in cell method.. however its not that straightforward as not all of the 'particulate phase forces' can be directly added as a source in-cell.. what i mean to say is that both drag and buoyancy are dependent on velocity and hence cannot be treated a complete source... for more info read this..
http://www.openfoam.org/mantisbt/fil...=1030&type=bug

Regards
ansubru
Thank you.

Quote:
Originally Posted by Shuai_W View Post
Hi jarpve,
I validated the DPMFoam with experiments by Muller et al, the investigated object is a bubbling fluidized bed with 44mm width, 200mm heights and 10mm depth. The numerical results from DPMFoam showed good agreements with the experimental data. Collisions between particles are modeled used soft-sphere model, which is different from MP-PIC in software Barracuda (CPFD). I think DPMFoam is DEM method that likes CFDEM.

Regards
Wang
Thank you Wang

Last edited by wyldckat; December 29, 2015 at 14:37. Reason: merged posts that were a few minutes apart
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Old   December 29, 2015, 20:01
Default four-way coupling method
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Shuai Wang
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Dear jarpve,
In recent days, I will develop a solver to simulate coal/wood gasification/combustion based on a CFD-DEM coupling approach (i.e. four-way coupling method), this work is based on coalChemistryFoam and DPMFoam, if you are interested in it, more information in this thread:
http://www.cfd-online.com/Forums/ope...tml#post577524
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Old   February 14, 2018, 09:33
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peter Li
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Hi ansubru
Do you have the rest of MPPICFoam tutorial?Can you give me a link?

thank you !
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Old   May 24, 2018, 11:28
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Min Zhang
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Quote:
Originally Posted by Shuai_W View Post
Hi,
I use DPMFoam to simulate gas-solid flow in a CFB riser, particle number is 201000 with diameter 185um, density 2400kg/m3. The wide-depth-height of the geometry is 32mm-1.2mm-300mm with grids of 64-3-600. However, I have some questions about the solver DPMFoam.
1. How to determine particle time-step in DPMFoam, I can't find this parameter.
2. In my work, I use 16 processors and find the simulation so slow. I want to know if anyone who utilized DPMFoam to simulate gas-solid flow with or more than 200000 particles?
3. The difference of detection algorithm of particle collisions between in DPMFoam and in CFDEM? Which is the better?
Thank you!

Wang

Hello Shuai,

I am wondering whether you could give me some reference (more details) about the detection algorithm of particle collisions. I want to know the difference between CFDEM and DPMFoam.
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Old   May 24, 2018, 11:32
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Min Zhang
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Quote:
Originally Posted by harmonica View Post
Hi ansubru
Do you have the rest of MPPICFoam tutorial?Can you give me a link?

thank you !
Hi,

Have you got the tutorial already? If you still need it, I could send to your email.
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Old   May 24, 2018, 11:49
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Min Zhang
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Quote:
Originally Posted by Shuai_W View Post
Dear jarpve,
In recent days, I will develop a solver to simulate coal/wood gasification/combustion based on a CFD-DEM coupling approach (i.e. four-way coupling method), this work is based on coalChemistryFoam and DPMFoam, if you are interested in it, more information in this thread:
http://www.cfd-online.com/Forums/ope...tml#post577524
Hello Shuai,

This is Min. I think you are an expert on DPMFoam now.

I am wondering whether you have some ideas about the difference between CFDEM and DPMFoam now?

Thanks and best regards,
Min
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