[taha91_1@hotmail.com]

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?

[Micael]

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.

[taha91_1@hotmail.com]

There is DEM Model built in FLUENT but it is not two way coupled and therefore results are not very accurate

[BlnPhoenix]

Originally Posted by taha91_1@hotmail.com

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

[taha91_1@hotmail.com]

Originally Posted by BlnPhoenix

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

[Micael]

Originally Posted by taha91_1@hotmail.com

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.

[taha91_1@hotmail.com]

Originally Posted by Micael

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.

[hossein76]

Originally Posted by BlnPhoenix

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?