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DDPM (dem) model specifying collisions with boundaries

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Old   April 1, 2016, 03:39
Default DEM Tutorials
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Amna
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hello Amir

could you please send DEM helping material on this id : amnaamanat73@gmail.com

Actually i m simulating a fluidized bed using DDPM model with DEM collisions & i dont know how to set the normal or tangential collision parameters in DEM tab.

it'll be really nice of you if you let me know this .

thankx
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Old   April 3, 2016, 11:41
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Rupesh Verma
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Quote:
Originally Posted by Amir1 View Post
Hi, Just sent you some papers you asked.

Good Luck, Amir
Hi Amir,
I am using ANSYS Fluent DDPM-DEM. Can you share the idea/papers about setting the value spring constant and damping etc.
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Old   April 10, 2016, 22:07
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Hi,

Just sent you some files.

GL, Amir
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Old   August 14, 2016, 18:06
Question DDPM-DEM to simulate transient flow in a downer fluidized bed column
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Hello All,
I am a beginner to use ANSYS Fluent DDPM-DEM to simulate transient flow in a downer fluidized bed column. I faced three main problems:
1- Because the DEM time step (s) 510−6 which i believe that it is the same as the particle step size is recommended to be very small then the solution is so time consuming. It takes one day for each 0.25 sec with a very good computer.
Does anybody have an idea to increase solution speed?

2- I suppose to have a continuous particle injection through the upper surface, but whatever I changed with the parcel release method, I got separate injections of particles. What to do to have a continuous solid flow?

3- Is it normal with transient flow to have highly oscillating residuals even if the simulation results were physically accepted?

Thank you

Dawood
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Old   February 16, 2017, 21:48
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David Li
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hello Amir

could you please send DEM helping material on my email address : wangtong218@gmail.com?

Now I'm working on the particle fouling in metal foam using DDPM + DEM.
it'll be really nice of you if you let me know this .

thanks
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Old   March 11, 2017, 08:11
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mohamed
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hello every one
I'm trying to model multi-phase flow (water - oil) in corrugated plat separator using multi-phase eulerian model and dence Discrete Phase model + stochastic collision +coalescence model. I got problem modeling oil droplet behavior.
My set up:
1) multi-phase eulerian model active dense Discrete Phase model (all others setting are default here)
2) Transition k-kl-epsilon model
3) Discrete phase model: unsteady particles tracking, interaction with continuous phase, implicit tracking, no accuracy control (all others setting are default here)
4) check in physical model stochastic collision +coalescence model all others setting are default here)
5) There is one cell zone: operating pressure=101325pa, gravity on, operating density=1100kg/m3
6) Boundaries: one velocity inlet, 1 pressure outlets, all others are walls
7) All solution controls are default, time step size 1 s
i have message reversed flow pressure outlet
So my question to you how to set up oil- water gravity separation problem properly, what models should i use?
pleas help me
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Old   March 24, 2017, 07:42
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Naval V.Koralkar
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Hello Amir
Can you please send me the papers on CFD-DEM simulations. My email id is koralkar.naval@gmail.com
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Old   March 28, 2017, 01:50
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Naval V.Koralkar
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Could you please mail me with those papers at koralkar.naval@gmail.com. Thank you.
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Old   May 1, 2017, 05:30
Default Dpm
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Hallo,
I'm doing my thesis currently an working on solar reactor.

I have a simple geometry of rectangular and i simulate am single phase flow and mixture flow in a laminar flow.

Now i want to inject particle in my flow but do not have idea how to do it.

I want to lagrangian-Eulerian model to track particle in my fluid.
Can anyone help my and coud you give me step wise how to do it because im totally new in fluent.

thank you
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Old   June 8, 2017, 05:41
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Quote:
Originally Posted by Amir1 View Post
Hi, Just sent you some papers you asked.

Good Luck, Amir
Hi, I'm also studying ddpm. Can you share the papers with me? thanks! ywj123450@gmai.com
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Old   July 18, 2018, 07:13
Default Dem
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Saxony Anhalt
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Quote:
Originally Posted by Amir1 View Post
Just sent you some useful papers. As I mentioned these articles gives you whats behind these numbers and what models you should select with which valuse.

Best, Amir
Dear Amir,

Is it possible you could also fwd me the papers you have mentioned. Thank you very much in advance.

Regards,
Umair
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Old   November 24, 2020, 05:03
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Quote:
Originally Posted by mroue View Post
Dear Amir,

Could you also please share the papers with me at mroue@hotmail.co.uk. Thank you
Dear Amir,
I have this difficulty in this respect, so could you also please share the papers with me at email[LDN18801161129@163.com].
Thank you.
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