Particle in a flow!
 

Hi all!

I wish to simulate a particle carried by a flow in a tube. Which method in Fluent will be suitable for this problem. Dynamic mesh? Multiple Frame of References? Or any other method?

Thanks in advance.

Greetings Varghese

Re: Particle in a flow!
 

Hey, If it is question of a single particle yes the deforming mesh approach is the best. You will easily find this case example in the Fluent library. If it is question of several partcle I would suggest the langragian approach.

Hope this will help. thomas

Re: Particle in a flow!
 

It is a single particle. I wish to know how the particle flows with the fluid motion and how its own momentum drives it in different path as fluid stream-lines.

Where do we find the Fluent Library?

Greetings Varghese

Re: Particle in a flow!
 

Hey, You can probably find it on the fluent user website, certainly on validations or tutorial for dynamics/deforming mesh. If you cannot find it i would advice you to contact the fluent hotline of your country.

good luck, thomas

Re: Particle in a flow!
 

You could also have a look over Eulerian Multiphase Mixture flow. It is easy and best for both laminer and turbulence flow in pipe flow. I'm using that for 5 different particle for both steady and unsteady in a turbulent region.

Alamgir

Single particle motion with the flow
 

Hi Varghese,
I want to simulate single particle motion with the flow in tube.

This post looks old but I hope someone will reply. I am using Fluent 12.0 .

Can I use DPM model to do that or please guide me with best approach to this model.How can I do it with dynamic mesh?

Thank you in advance.

Hi,
you can easily do that by DPM. it's not necessary to use dynamic mesh!!!

Thank for reply Amir.

I have a question again.
What should be value of the injection velocity when we try to define injection.???
Should it be same as flow velocity or anything else. As my partcile flows with the flow what velocity should I use for injection. B.C for the flow at the inlet (Continuous phase) is velocity inlet.


Thanks again!

Hi raj,
it depends on your case, in realistic ones, fluid contains particles before entering the geometry in such cases you can set inlet flow velocity for injected particles. otherwise for particles with low stokes number, they can accommodate themselves in a relatively short time, here you can also use flow velocity.
if you set particle flow rate equal to 0, every streams contain just one particle otherwise your injection B.C. is the same for all particles in a same stream.

Hello Amir,

Thank you again. I was able to run and track the particle.:)

I am trying to get the forces( mainly Drag)acting on the each particle. How can I get it from Fluent.

How can I define shape factor for cylinder with large aspect ratio.?

Hi raj,
you can define a shape factor for your particles in:
define->models->discrete phase->tracking tab->drag parameters->non-spherical...
for finding drag force I don't know any straight forward procedure but you can use a simple UDF for that. if you find easier way, let me know.

regards,

Amir