CFD Online Discussion Forums (https://www.cfd-online.com/Forums/)
-   FLUENT (https://www.cfd-online.com/Forums/fluent/)
-   -   3D,Solid-Liquid simulation in stirred tank (https://www.cfd-online.com/Forums/fluent/27976-3d-solid-liquid-simulation-stirred-tank.html)

 Mike Thai's son October 23, 2000 11:23

3D,Solid-Liquid simulation in stirred tank

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.

Mike Thai's son

 commonyue June 25, 2010 09:23

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

 All times are GMT -4. The time now is 18:48.