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

Saffman Lift Force

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

LinkBack Thread Tools Display Modes
Old   November 26, 2002, 19:26
Default Saffman Lift Force
Posts: n/a
Hallo In the Fluent manual, its writtin as: -- The Saffman's lift force, or lift due to shear, can also be included in the additional force term as an option. The lift force used is from Li and Ahmadi [ 135] and is a generalization of the expression provided by Saffman [ 196]:

(19.2.19) [please see the equation in the manual, V6]

where K=2.594 and d ij is the deformation tensor. This form of the lift force is intended for small particle Reynolds numbers. Also, the particle Reynolds number based on the particle-fluid velocity difference must be smaller than the square root of the particle Reynolds number based on the shear field. Since this restriction is valid for submicron particles, it is recommended to use this option only for submicron particles. ---- My question is, after solving a particulate flow (enabling the saffman lift forc), how can I calculate the saffman lift force at a particular location of the particle trajectory? I know particle size, density, velocity and also fluid velocity, so I know Ur, Cd, Rep, but how do I know deformation tensor along the path of the particles?

Any suggestion would be appreciated.

  Reply With Quote


Thread Tools
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 On
Pingbacks are On
Refbacks are On

Similar Threads
Thread Thread Starter Forum Replies Last Post
Force can not converge colopolo CFX 13 October 4, 2011 22:03
Saffman Lift Force: confused CFD_MAN FLUENT 5 September 9, 2010 04:51
Calculation of Saffman Lift Force JPBodner Main CFD Forum 3 August 4, 2010 11:11
Urgently Need the code of Lift force and VM force Kai Yan Main CFD Forum 0 July 16, 2008 07:07
Lift force or coefficient of lift Rola FLUENT 1 November 12, 2006 14:29

All times are GMT -4. The time now is 04:14.