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mohamad November 21, 2007 06:32

gas solid fluidizd bed with cfx
how can i model a gas solid fluidized bed with ansys cfx? i dont have injection of particles but a static bed at minimum fluidization velocity i can not define solid particles in the domain

Ribeiro November 26, 2007 14:58

Re: gas solid fluidizd bed with cfx
Hi Mohamad

You can set your bed through solid volume fraction initial Condition. You may use CEL's step function such that


assuming your gravity parallel to z and bed heigth (from z=0) of 0.5 m.

Hope this helps

mohamad November 27, 2007 04:03

Re: gas solid fluidizd bed with cfx
hi Ribeiro I am not familiar with cel expression very much.when i make a new expression as "step((z-0.5[m])/1[m])"how can i use it in my simulation. thank you

Ribeiro November 27, 2007 08:24

Re: gas solid fluidizd bed with cfx
You gonna give this expression a name, right? So you can write it in any space through out the setup where the "root of alpha" buttom is present.

For this particular case you should go in Global Initialization (or in Domain tab called Initialization), change the option of solid volume fraction to 'Automatic with Value'. Then click on "root of alpha" buttom and write the name of CEL expression. It is pretty easy.

Good luck.

mohamad December 2, 2007 04:20

Re: gas solid fluidizd bed with cfx
the problem is when i use "particle tracking" i can not find particle volume fraction option in initialization tab???????

germangsilva July 28, 2010 15:15


I'm doing studies of fluidization (gas-solid), I'm using cfx11 or 12, and applying LES, but I have great difficulty setting the program cfx, I ask your help, please. my email is

with Regards

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