3D,Solid-Liquid simulation in stirred tank

October 23, 2000, 12:23

Hi friends,

I am new in CFD but I am working with 3D simulation of mixing-tank bioreactor with 2 phases involved for the moment(water as fluid and beads as solid and the initial solid vol fraction is about 0.3)(3-phase simulation are waiting to be solved afterward).My system have 2 radial impeller with no buffle.

I used Eulerian(granular) multiphase model to investigate the suspension of beads(solid particles)by turn on the time-dependence option...... At first ,I run the simulation with Multi-reference frame(MRF). After getting the converged solution.....I check the average value of solid vol fraction....it appeared to be about zero( instead of about 0.3) which look weird.

But,then, I find the limitations of the Eulerian Multiphase model that it cannot be used with sliding or deforming meshes.(from fluent user's guide vol.2 page9-5 )

My question is..... Is the fixed velocity( as an impeller model instead of MRF or sliding mesh) become the only way I can use to deal with my simulation ??....(according to limitation I mentioned) Any more suggestion are gladly welcome.

Thank you in advance.

Mike Thai's son

commonyue · June 25, 2010, 10:23

Hi, i am also working on two phase simulation now (water and glass beads),I think u can use the SG method for your simulation,but using MFR can get you steady state result, if the volume fraction is 0 instead of 0.3 using MFR, maybe there is something wrong with other parameter setting, not due tot the MFR method?...

Hope you will figure it out...

Lily

October 23, 2000, 12:23	3D,Solid-Liquid simulation in stirred tank	#1
Mike Thai's son Guest Posts: n/a	Hi friends, I am new in CFD but I am working with 3D simulation of mixing-tank bioreactor with 2 phases involved for the moment(water as fluid and beads as solid and the initial solid vol fraction is about 0.3)(3-phase simulation are waiting to be solved afterward).My system have 2 radial impeller with no buffle. I used Eulerian(granular) multiphase model to investigate the suspension of beads(solid particles)by turn on the time-dependence option...... At first ,I run the simulation with Multi-reference frame(MRF). After getting the converged solution.....I check the average value of solid vol fraction....it appeared to be about zero( instead of about 0.3) which look weird. But,then, I find the limitations of the Eulerian Multiphase model that it cannot be used with sliding or deforming meshes.(from fluent user's guide vol.2 page9-5 ) My question is..... Is the fixed velocity( as an impeller model instead of MRF or sliding mesh) become the only way I can use to deal with my simulation ??....(according to limitation I mentioned) Any more suggestion are gladly welcome. Thank you in advance. Mike Thai's son

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June 25, 2010, 10:23		#2
commonyue New Member Li Liu Join Date: Nov 2009 Posts: 16 Rep Power: 0	Hi, i am also working on two phase simulation now (water and glass beads),I think u can use the SG method for your simulation,but using MFR can get you steady state result, if the volume fraction is 0 instead of 0.3 using MFR, maybe there is something wrong with other parameter setting, not due tot the MFR method?... Hope you will figure it out... Lily