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Multiphase in ANSYS FLUENT vs other softwares

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Old   February 27, 2018, 21:01
Question Multiphase in ANSYS FLUENT vs other softwares
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Taha Abbas Bin Rashid
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Hello everyone
I am new to CFD and want to know why FLUENT is not suitable for DEM simulation. As far as I know FLUENT works using Eulerian approach while solid particles are best simulated using Lagrangian approach. That's why there are some open source and commercial softwares like EDEM that are coupled with FLUENT to run simulation. According to my knowledge we can simulate DPM and DDPM in FLUENT but these models are very inaccurate. DEM has very high accuracy but FLUENT doesn't solves this very accurately due to its Eulerian approach.
So I want to ask that
1. Isn't there any way to simulate solid particles in fluidized bed using UDF (in FLUENT) only.
2. Does ANSYS 19 provides any option for DEM simulations?
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Old   February 28, 2018, 09:44
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Micael
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There is a DEM model in FLUENT. I got to say it's not really mature, you might consider other code for DEM, but it works.
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Old   February 28, 2018, 09:48
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There is DEM Model built in FLUENT but it is not two way coupled and therefore results are not very accurate
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Old   February 28, 2018, 11:02
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Quote:
Originally Posted by taha91_1@hotmail.com View Post
Hello everyone
I am new to CFD and want to know why FLUENT is not suitable for DEM simulation. As far as I know FLUENT works using Eulerian approach while solid particles are best simulated using Lagrangian approach. That's why there are some open source and commercial softwares like EDEM that are coupled with FLUENT to run simulation. According to my knowledge we can simulate DPM and DDPM in FLUENT but these models are very inaccurate. DEM has very high accuracy but FLUENT doesn't solves this very accurately due to its Eulerian approach.
So I want to ask that
1. Isn't there any way to simulate solid particles in fluidized bed using UDF (in FLUENT) only.
2. Does ANSYS 19 provides any option for DEM simulations?
May i ask where you found that DPM and DDPM in Fluent is inaccurate?

1. I don't understand your first question. You can simulate particles in fluidized bed in Fluent using 2-way or 4-way coupling. What do you need a UDF for exactly?
2. Can you maybe highlight your definition of DEM in contrast to DDPM, so maybe it is easier to understand what you want to achieve and where FLUENT can help or can not help. I don't get why Fluent would not be able to achieve your task.

Regards
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Old   February 28, 2018, 12:04
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Taha Abbas Bin Rashid
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Quote:
Originally Posted by BlnPhoenix View Post
May i ask where you found that DPM and DDPM in Fluent is inaccurate?

1. I don't understand your first question. You can simulate particles in fluidized bed in Fluent using 2-way or 4-way coupling. What do you need a UDF for exactly?
2. Can you maybe highlight your definition of DEM in contrast to DDPM, so maybe it is easier to understand what you want to achieve and where FLUENT can help or can not help. I don't get why Fluent would not be able to achieve your task.

Regards
1. I watched a webinar of EDEM, in which instructor told that ANSYS DEM is one way coupled and therefore EDEM coupling with FLUENT is required for two way coupling
2. Kindly read the conclusion of this paper
https://www.sciencedirect.com/scienc...32591014000096
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Old   March 2, 2018, 16:17
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Quote:
Originally Posted by taha91_1@hotmail.com View Post
There is DEM Model built in FLUENT but it is not two way coupled and therefore results are not very accurate
You got this from the webinar? Fluent built-in DEM model is 4-way coupled. One can simulate a fluidized bed with it.
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Old   March 3, 2018, 03:00
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Quote:
Originally Posted by Micael View Post
You got this from the webinar? Fluent built-in DEM model is 4-way coupled. One can simulate a fluidized bed with it.
My apologies then, maybe ANSYS 19 has 4 way coupled DEM.
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Old   October 27, 2021, 07:45
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Quote:
Originally Posted by BlnPhoenix View Post
May i ask where you found that DPM and DDPM in Fluent is inaccurate?

1. I don't understand your first question. You can simulate particles in fluidized bed in Fluent using 2-way or 4-way coupling. What do you need a UDF for exactly?
2. Can you maybe highlight your definition of DEM in contrast to DDPM, so maybe it is easier to understand what you want to achieve and where FLUENT can help or can not help. I don't get why Fluent would not be able to achieve your task.

Regards
Hello my friend
How do I do 4-way simulation?
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