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-   -   Modelling Slurry flow (https://www.cfd-online.com/Forums/fluent/84134-modelling-slurry-flow.html)

sandisk January 20, 2011 19:02

Modelling Slurry flow
 
My work is to use mixture model in multiphase flow to simulate slurry flow in straight pipe.The slurry is of water and 0.02476 in. sand particles(5 %). My simulation is not converging. I am not sure which drag functions and other functions to use. Has anyone simulated slurry flow with mixture model ? Please help .. or we should use eulerian model only ?

Nikolopoulos January 21, 2011 13:00

Use mixture model is the slip velocity between phases is small and not important.

Use Euler if not.

You are using an unsteady solver?

sandisk January 21, 2011 13:15

The slip velocity between particles is not important, I have unchecked that option. I need to find the pressure drop in the pipe.I am not getting covergence with Euler model too, I tried Schiller naumann drag function and also gidaspow model. I am not sure which options of drag function to select in mixture model. Have you any experience in modelling slurry flow in straight pipes ?

sandisk January 21, 2011 13:17

I am not using unsteady solver, I am using steady state solver .. Should I use unsteady state ?

Nikolopoulos January 21, 2011 13:36

I 'm experienced in Euler - Euler granular flows. I'm working in CERTH/ISFTA in EMMS scheme which is a sub-grid drag model.

I'm not familiar with mixture but i know its limitations.

For sure go to unsteady even if the physics of the problem is steady.
The only way to go steady is with these new pressure-velocity coupling schemes of Fluent 12 but i don't recommend them.

sandisk January 21, 2011 13:44

Thanks, I had treid the Euler model. But I am not getting convergence,I am not sure where I am going wrong. Can you help me look at my case file, if you can. I am stuck in this problem for last 1 week and I am not going any ahead. If I am able to simulate with Euler model, it will be some progress. Will be really gratefull if you can help me with eulerian model ? pls let me know if it is covenient with you ? Thanks for your help ?

manowars October 28, 2014 02:23

Dear Nikolopoulos,

I am coding the EMMS global using paper of W. Wang and J. Li (2007). I guess, your EMMS model is EMMS/matrix?

What value of eps_mf? I used 0.4

Can you suggest which value of convergence criteria for hydrodynamics should be suitable? (I am using 1e-3, but it is not converged for eps_g < 0.6)

Can you recommend how many step for each loop? (I am using 20(steps for eps_gc)x20(steps for eps_gf)x1(a_f = -9.8)x100 (for a_c))

Thank you and best regards,

prateekj05 January 18, 2017 12:28

Hi, I'm working on modelling slurry flow through horizontal pipes. I can't converge it. Could anybody help? I've exhausted all my options :'(

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Kushal Puri January 19, 2017 10:14

Quote:

Originally Posted by sandisk (Post 291447)
My work is to use mixture model in multiphase flow to simulate slurry flow in straight pipe.The slurry is of water and 0.02476 in. sand particles(5 %). My simulation is not converging. I am not sure which drag functions and other functions to use. Has anyone simulated slurry flow with mixture model ? Please help .. or we should use eulerian model only ?

I did thesis on this, you can refer this link

http://dspace.thapar.edu:8080/jspui/handle/10266/2899

Kushal Puri January 19, 2017 10:19

Quote:

Originally Posted by prateekj05 (Post 633769)
Hi, I'm working on modelling slurry flow through horizontal pipes. I can't converge it. Could anybody help? I've exhausted all my options :'(

Sent from my ONEPLUS A3003 using CFD Online Forum mobile app

I did thesis on this, you can refer this link

http://dspace.thapar.edu:8080/jspui/handle/10266/2899


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