# problem with dispersed solid model and exp

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 October 3, 2016, 23:09 problem with dispersed solid model and exp #1 New Member   Join Date: Nov 2014 Posts: 16 Rep Power: 5 hi I'm modeling a tank that contain water and some solid particles. I'm using dispersed solid model to simulate solid particles. i want to record the volume fraction or mass concentration of particles at outlet. so i used the following exp: ave(phase1.vf )@outlet after some time...the tank is empty of solid particles but the exp give some bad result and it shows that solids are crossing the outlet but there is no solid in tank ( I did simulation with very qualified mesh but it happened again.i used dp but not helped... can anyboidy help me whats wrong with this expression ? i think the exp is wrong...please give me some ideas. thanks

 October 4, 2016, 04:51 #2 Super Moderator   Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 14,098 Rep Power: 109 Note the averaging function you used is just an arithmetic average of all the faces, regardless of size. You probably want to use areaAve() instead so you get an area weighted average. But I cannot help you with your actual question at the moment. It sounds like a setup problem.

October 6, 2016, 11:23
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Quote:
 Originally Posted by ghorrocks Note the averaging function you used is just an arithmetic average of all the faces, regardless of size. You probably want to use areaAve() instead so you get an area weighted average. But I cannot help you with your actual question at the moment. It sounds like a setup problem.

Hi ghorrocks. thank you
i also used areaAve() and the results were same..now I use massflowAve() and i'm waiting for the results...

some information of simulation:
particle diameter : 30 micron
particle density :1900 kg m^-3
using buoyancy
turbulence model: k-e RNG (Homo)
isothermal
drag coef: 0.44 (default)
BC: 1 inlet-1 outlet-2 symmetric-walls..

and something that make me confused in results : for the walls..the contour show a 0.5 volume fraction for solid just at one point on wall (after the whole particle left the tank) ..I used very very refined mesh with inflation...max of yplus is 3
...

 October 9, 2016, 07:04 #4 Super Moderator   Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 14,098 Rep Power: 109 Is this a Eularian or Lagrangian model? Please shows some images of what you are modelling and the results you are getting. Also show why it is wrong, and what you expect to get.

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