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 ?

Use mixture model is the slip velocity between phases is small and not important.
Use Euler if not. You are using an unsteady solver? 
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 ?

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

I 'm experienced in Euler  Euler granular flows. I'm working in CERTH/ISFTA in EMMS scheme which is a subgrid 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 pressurevelocity coupling schemes of Fluent 12 but i don't recommend them. 
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 ?

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 1e3, 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, 
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 
Quote:
http://dspace.thapar.edu:8080/jspui/handle/10266/2899 
Quote:
http://dspace.thapar.edu:8080/jspui/handle/10266/2899 
All times are GMT 4. The time now is 22:43. 