CFD Online Logo CFD Online URL
www.cfd-online.com
[Sponsors]
Home > Forums > Software User Forums > OpenFOAM > OpenFOAM Running, Solving & CFD

How to set the maximum volume fraction of solids in a settling tank?

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

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old   February 5, 2021, 04:25
Default How to set the maximum volume fraction of solids in a settling tank?
  #1
New Member
 
Edward Ng Kian Guan
Join Date: Feb 2021
Posts: 5
Rep Power: 5
edwardKGN is on a distinguished road
As per the title, is there a way to set the maximum volume fraction of solids for multiphaseEulerFoam?

For example, instead of maximum volume fraction (alpha in OpenFOAM) of 1.0, the highest the volume fraction could go is 0.07.

The attached case folder (settlingTank2D_base) converges however, the maximum volume fraction at the end exceeds desired value (alpha = 0.58, instead of the desired alpha = 0.07) at the settled solids region.

OpenFOAM 8 was used.

Thank you in advance for your replies!
Attached Files
File Type: zip settlingTank2D_base.zip (14.5 KB, 6 views)
edwardKGN is offline   Reply With Quote

Old   February 5, 2021, 08:36
Default
  #2
Member
 
Utkan Caliskan
Join Date: Aug 2014
Posts: 42
Rep Power: 11
dscian is on a distinguished road
You should use kineticTheory instead of laminar in momentumTransport.particles file.

Probably the solver will keep the max alpha at that level. However, I find 0.07 very small for a close-packed volume fraction.
dscian is offline   Reply With Quote

Old   February 9, 2021, 04:55
Default Sort of Resolved?
  #3
New Member
 
Edward Ng Kian Guan
Join Date: Feb 2021
Posts: 5
Rep Power: 5
edwardKGN is on a distinguished road
Found a tutorial case file that uses kineticTheory - fluidisedBed

Modified it to reduce the maxAlpha value (set to maxAlpha = 0.3, and also reduced initial alpha = 0.1). Converged successfully. <Attached as fluidisedBed_M1E1_base>

However, now the case behaves as if its a settling tank instead of a fluidised bed. <Attached as fluidisedBed_M0E3_base, only modified simulation to run at adjustableRunTime, otherwise unchanged>

Is there a reason for this change?

Also checked the source code for kineticTheory. It is based on work done be Welchem, 'Derivation, Implementation, and Validation of Computer Simulated Models For Gas-Solid Beds'.

Can this be used for slurry (Liquid-Solid) systems?

My understanding is that the results may be similar with the difference being Gas is compressible and Liquid is incompressible, resulting in potentially different friction factors.

P.S. If this reply is repeated, my bad, when I was checking the thread the previous reply was not found as of writing of this reply, not certain why.
Attached Files
File Type: zip fluidisedBed_M0E3_base.zip (14.8 KB, 6 views)
File Type: zip fluidisedBed_M1E1_base.zip (14.8 KB, 3 views)
edwardKGN is offline   Reply With Quote

Old   February 10, 2021, 05:47
Default
  #4
New Member
 
Edward Ng Kian Guan
Join Date: Feb 2021
Posts: 5
Rep Power: 5
edwardKGN is on a distinguished road
Checking through the settings of fluidisedBed, I noticed it was using a modified version of kineticTheory - phasePressureModel.

An alternative tutorial case that uses kineticTheory is the LBend tutorial case
edwardKGN is offline   Reply With Quote

Reply

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
Foam::error::printStack(Foam::Ostream&) in compressibleInterFoam JM27 OpenFOAM Running, Solving & CFD 2 May 26, 2020 09:13
multiphaseEulerFoam high Courant number Frenk_T OpenFOAM 5 November 24, 2016 04:23
alphaEqn.H in twoPhaseEulerFoam cheng1988sjtu OpenFOAM Bugs 15 May 1, 2016 17:12
interDyMFoam - change in volume fraction gopala OpenFOAM Running, Solving & CFD 0 April 27, 2009 11:46
On the damBreak4phaseFine cases paean OpenFOAM Running, Solving & CFD 0 November 14, 2008 22:14


All times are GMT -4. The time now is 09:55.