CFD Online Logo CFD Online URL
www.cfd-online.com
[Sponsors]
Home > Forums > OpenFOAM Pre-Processing

TwoPhaseEulerFOAM

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

Like Tree1Likes
  • 1 Post By wyldckat

Reply
 
LinkBack Thread Tools Display Modes
Old   January 3, 2015, 04:52
Default TwoPhaseEulerFOAM
  #1
Senior Member
 
harshawardhank
Join Date: Mar 2014
Posts: 102
Rep Power: 5
harsha_kulkarni is on a distinguished road
Hello Friends,

I am using twophaseEulerFoam for simulation of Fluidized Bed. I want to know that what are the JohnsonJacksonCoeffs

{
Fr 0.05;
eta 2;
p 5;
phi 28.5;
}

Regards

Harshawardhan
harsha_kulkarni is offline   Reply With Quote

Old   January 3, 2015, 17:26
Default
  #2
Super Moderator
 
Bruno Santos
Join Date: Mar 2009
Location: Lisbon, Portugal
Posts: 10,020
Blog Entries: 39
Rep Power: 109
wyldckat is a glorious beacon of lightwyldckat is a glorious beacon of lightwyldckat is a glorious beacon of lightwyldckat is a glorious beacon of lightwyldckat is a glorious beacon of lightwyldckat is a glorious beacon of light
Greetings Harshawardhan,

I was going to say that the source code has the answer, but: https://github.com/OpenFOAM/OpenFOAM...tionalStress.H
Quote:
Code:
        //- Material constant for frictional normal stress
        dimensionedScalar Fr_;

        //- Material constant for frictional normal stress
        dimensionedScalar eta_;

        //- Material constant for frictional normal stress
        dimensionedScalar p_;

        //- Angle of internal friction
        dimensionedScalar phi_;
Only the last one is clear on what it is exactly. The first three seem consistent with the theoretical modelling for this kind of simulation.
A bit of research into this topic leads me to believe that they are all empirical model coefficients of the following bibliographic reference:
Quote:
Johnson, P. C., and R. Jackson (1987), Frictional-collisional constitutive relations for granular materials, with application to plane shearing, Journal of Fluid Mechanics, 176, 6793
Best regards,
Bruno
FransVisscher likes this.
__________________
wyldckat is offline   Reply With Quote

Old   January 6, 2017, 07:30
Default
  #3
Member
 
Darko Radenkovic
Join Date: Oct 2015
Posts: 34
Rep Power: 3
dradenkovic is on a distinguished road
If someone needs information about the aforementioned parameters, this reference could also be useful:

P. C. JOHNSON, P. NOTT , R. JACKSON, Frictional-collisional equations of motion for
particulate flows and their application to chutes, J . Fluid Mech. (1990), pp. 501-535

Starting from eq. (2.18).

Regards,
Darko
dradenkovic is offline   Reply With Quote

Reply

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
Is twoPhaseEulerFoam applicable to 3D cases / delivering erroneous results? ThomasV OpenFOAM 0 November 11, 2013 09:10
Error, running a modified version of twoPhaseEulerFoam foamer OpenFOAM Running, Solving & CFD 0 March 11, 2012 17:17
Something wrong in UEqns.H within twoPhaseEulerFoam cheng1988sjtu OpenFOAM 2 June 24, 2011 10:48
twoPhaseEulerFoam freemankofi OpenFOAM 0 May 23, 2011 16:24
TwoPhaseEulerFoam bed tutorial case stable in 1.5, crashes in 1.6 hemph OpenFOAM 3 December 5, 2009 05:19


All times are GMT -4. The time now is 14:46.