Solid particles never come to rest (Ansys Fluent DPM)

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  • Last Post 21 February 2018
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Billy posted this 18 February 2018

 

Hi,

I have currently been attempting to fill a silo with solid particles. For this problem I am only using DPM model. I am injecting the solid particles through the inlet (top of the silo) and allowing them to fall under gravity. I have set all boundaries (walls and outlet) to 'reflect' so the particles will stay inside the silo, however I am finding that the particles never come to rest (always still moving) and am requiring 1000's of iterations/1000's of seconds and still the same result. As shown in the attached picture, that is the result I am looking for however I am just wanting to fill the silo and not release the particles. I am quite stumped on how to achieve this.
What could be the issue in my case?
Could anyone suggest alternative methods to achieve this?

Any help is greatly appreciated.

Also note: I am not planning on using the large amount of particles as shown in the picture, it is purely just a representation of what I am attempting to do.

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Raef.Kobeissi posted this 18 February 2018

Hi.

DPM in Fluent is a method to simulate very small particles driven by the forces applied by a fluid domain.

whats your fluid domain in this simulation? Also where did you get this picture from, it doesn't look like it is from Fluent or CFD Post.

cheers

Raef Kobeissi

Billy posted this 18 February 2018

Hi Raef, I appreciate your reply.

In my simulation there will be no fluid, however just gas (air). I understand Ansys Fluent is not the most applicable software (compared to EDEM for example) for simulating flow of solid particles using DEM, however Ansys is all I have access to and thus need to simulate my described problem as best I can using Fluent.

As for the picture, it is not from Fluent or CFD Post, but was only added as a representation of what I am trying to do (not as many particles though).

So I am guessing I can't use DPM for my case? Should I be looking into the multiphase models instead?
What method using ANSYS could best replicate my problem?

Thanks again.

Billy

peteroznewman posted this 20 February 2018

Hi Billy,

If you are just going for an illustration, you could use a free 2D program like Algodoo.

 

I created the above scene in 10 minutes and it solves in real time. They have a 3D version that runs with SpaceClaim. Below is an example of that, jump forward to 20 seconds and see nuts being aligned in a bowl.

 

If you want more exact physics in an ANSYS product, you could try Explicit Dynamics, however that will take a long time to solve. 

Regards,

Peter

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Billy posted this 21 February 2018

Hi Peter,

Thanks for your response. These options have definitely given me food for thought.

Cheers,

Billy

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