CFD Online Logo CFD Online URL
www.cfd-online.com
[Sponsors]
Home > Forums > Software User Forums > ANSYS > FLUENT > Fluent UDF and Scheme Programming

Drag Force UDF in Non-Newtonian (powerlaw) Fluid

Register Blogs Community New Posts Updated Threads Search

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old   October 27, 2012, 12:21
Question Drag Force UDF in Non-Newtonian (powerlaw) Fluid
  #1
New Member
 
Ali
Join Date: Mar 2011
Posts: 27
Rep Power: 15
ali hemmati is on a distinguished road
Hello,

I am going to simulate the behaviour of micron-sized particles in an non-Newtonian fluid medium. In fact, the flow viscosity follows the "power-law". I know that "DEFINE_DPM_DRAG(Drag_force,Re,p)" can pass the force per mass of each particle to Fluent, and that the returned valuee must be in form of "18*Cd*Re/24".

As you know, in powerlaw fluid, Re is defined as Re = \rho V^{2-n} d^{n} / m , and d being the particle diameter and m the "consistency index".

The problem is, how does Fluent define Re number? Does Fluent think of Newtonian Re or this definition of Re? Should I pass this Re in "18*Cd*Re/24" or the Newtonian Re?

Thank you!
ali hemmati is offline   Reply With Quote

Old   July 6, 2015, 13:16
Default Hi
  #2
New Member
 
Marcos
Join Date: Nov 2013
Posts: 12
Rep Power: 13
marcoscp2 is on a distinguished road
Were you able to solve your problem?
marcoscp2 is offline   Reply With Quote

Old   March 28, 2019, 14:08
Default
  #3
Member
 
Liliana de Luca Xavier Augusto
Join Date: Feb 2013
Posts: 68
Rep Power: 13
liliana is on a distinguished road
Hi!

Have you guys solved the problem? I am having the same issue here...
liliana is offline   Reply With Quote

Reply

Tags
non-newtonian, particle tracking, udf


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
Drag force on scaled models. arunjingade Main CFD Forum 6 July 1, 2010 09:54
Lift and drag force Arti Main CFD Forum 0 April 23, 2009 23:46
Fluid mechanics / drag & lift Jamcam Main CFD Forum 0 October 31, 2002 05:39
Terrible Mistake In Fluid Dynamics History Abhi Main CFD Forum 12 July 8, 2002 10:11
Airfoil Drag Force wowakai Main CFD Forum 3 October 13, 1998 20:27


All times are GMT -4. The time now is 15:38.