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-   -   Particle motion in laminar flow (http://www.cfd-online.com/Forums/fluent/104994-particle-motion-laminar-flow.html)

prezza July 20, 2012 05:51

Particle motion in laminar flow
 
Hello folks,

I want to simulate the dynamic motion of a rigid particle in laminar flow, doesn't matter 2d or 3d, very similar to this thread, but with much smaller particle diameter (about 1/5 to 1/10 of pipe/channel diameter). So I expect to have rotational (due to shear stress) and translational movement.

Now I would be grateful if anybody could help me with my questions:
  1. Which package would be more suitable for this purpose CFX or Fluent? (I want to compare results with our in-house solver.)
  2. How can I define moving mesh and immersed body in this case and get the local/temporal drag and lift forces.
  3. Is it possible to use a structured mesh (multi-block of course) for this purpose or am I forced to use unstructured tet auto mesh generation?
Thanks

vagaikwa July 24, 2012 21:36

HI Prezza,
Im trying to do something similar..Have you found the way to do it?

Verherezeid July 24, 2012 22:14

yaah same problem here,, when is the time i use structrure mesh or unstructure mesh ?
hope anyone else can help us:D:D

Verherezeid July 24, 2012 22:20

yaah same problem here,, when is the time i use structrure mesh or unstructure mesh ?
hope anyone else can help us:D:D

prezza July 27, 2012 17:30

I have not found a way. I really counted on a posting my question here.

I try to repost it in CFX forum. Maybe somebody could help us.

CFDManIran July 28, 2012 15:02

Particle Tracking in Laminar Flow
 
As I found your problem is not a particle tracking problem which can be modeled as DPM in FLUENT and as you mentioned you should use Dynamic Mesh Model in FLUENT.
For your case the 6DOF module of Dynamic Mesh shall be used ans as you don't know the particle path prior to solution I propose you use re-meshing as Updating Method so unstructured grid is more suitable. Beside these you know that FLUENT uses only Unstructured grids and the difference are only in grid Regularity and shapes and not in their structure
Foe more information you can find some lectures in the website
Captions are in Persian but Contents are in English.
Wish you be useful

www.petrodanesh.ir


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