CFD Online Logo CFD Online URL
Home > Forums > General Forums > Main CFD Forum

Kinetic Theory in Multiphase

Register Blogs Members List Search Today's Posts Mark Forums Read

LinkBack Thread Tools Search this Thread Display Modes
Old   June 3, 2009, 22:54
Default Kinetic Theory in Multiphase
New Member
Join Date: Jun 2009
Posts: 1
Rep Power: 0
mtl is on a distinguished road
Hi, I am doing research into CFD modeling of fluidized beds & cyclones. For the past one month I have been trying to use multiphase models, to no avail.

I decided to post this thread to clear some doubts on the use of kinetic theory in gas-solid simulations, and hope that it helps other researchers as well.

Please comment if any users have found the following observations contradicting

The dynamic viscosity required for a 'solid' material does not matter. No matter whether the value is from 0.05 till 1e-7 [Pa.s].

The kinetic theory will work with the granular temperature model of zero equation. The alternate algebraic equilibrium model always cause an overflow in the solver (this is the default model in CFX).

Literature suggest using Ding & Gidaspow's model of equating the granular temperature with velocity fluctuations, which is represented in another form in the zero equation anyway.

Without the kinetic theory, the simulation can still run. However, the drag coefficient would be different. Velocity profiles would remain the same as well.
mtl is offline   Reply With Quote


fluidized beds, granular temperature, kinetic theory, multiphase

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are On
Refbacks are On

Similar Threads
Thread Thread Starter Forum Replies Last Post
udf for cohesive forces in kinetic theory T.Hari FLUENT 1 October 6, 2014 14:41
Mixture model and kinetic theory Fuping Qian FLUENT 3 January 24, 2011 06:58
CP - KINETIC THEORY Leo FLUENT 0 October 15, 2007 10:40
Kinetic Theory Tommaso Main CFD Forum 1 June 30, 2003 10:06
solid kinetic theory wan xiaotao Main CFD Forum 6 August 10, 1999 18:43

All times are GMT -4. The time now is 18:15.