CFD Online Logo CFD Online URL
Home > Forums > FLOW-3D

about maximum packing fraction

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

Like Tree1Likes
  • 1 Post By JBurnham

LinkBack Thread Tools Display Modes
Old   September 21, 2012, 13:26
Default about maximum packing fraction
Yi-Lang Chen
Join Date: May 2009
Posts: 58
Rep Power: 10
Andy Chen is on a distinguished road
Dear experts:

When I use sediment scour model. We need set up about sediment parameter(ex:diameter, density, critical shield number, and maximum packing fraction et al.). I have read user's manual, but I still do not understand what is maximum packing fraction. What will happen about result If I set 0 or 1.

Thanks your help!!
Andy Chen is offline   Reply With Quote

Old   October 22, 2012, 12:32
Senior Member
Jeff Burnham
Join Date: Apr 2010
Posts: 204
Rep Power: 10
JBurnham is on a distinguished road
Maximum packing fraction is the fraction (volume of all sediment species/open volume in cell) of sediment at which the cell becomes 'packed' and the drag function in the cell goes to infinity (no flow). It is equal to (1 - porosity). 0.64 is the default and has been analytically demonstrated for uniformly-sized randomly-packed spheres. Sand is typically of porosity 0.3 to 0.45, so max packing fraction of 0.55 - 0.7.
Flowdy likes this.
JBurnham is offline   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
alphaEqn.H in twoPhaseEulerFoam cheng1988sjtu OpenFOAM Bugs 15 May 1, 2016 16:12
compressible flow in turbocharger riesotto OpenFOAM 50 May 26, 2014 01:47
Water subcooled boiling Attesz CFX 7 January 5, 2013 04:32
On the damBreak4phaseFine cases paean OpenFOAM Running, Solving & CFD 0 November 14, 2008 22:14
CFX Solver Memory Error mike CFX 1 March 19, 2008 08:22

All times are GMT -4. The time now is 23:25.