the volume fraction of water remains 1 although it is partly occupied by particles

synuk75 · July 14, 2018, 06:14

Hi guys,

I am trying to simulate a bunch of particles moving in water and gas with a two way coupled model. i have simulated water and gas using eulerian multiphase and the particles using DEM. when i have a look to the volume fraction of water and gas, it is like the particles dont affect the volume fraction of the continuum phases at all. i want that the space occupied by the particles are not share with the continuum phases though. any ideas guys?

do i have to specify the multiphase interactions with VOF-lagangian phases or are these interactions assumed when i choose the two way coupling model for the DEM?

Thank you very much

synuk75 · July 17, 2018, 13:57

Hi guys,

i am really struggling with this issue.

any idea of how STAR+ account for the particles when modelling the fluids? if the volume fraction of the continuum phase remain 1 despite there are plenty of particles, then the particles dont have any effect on the fluid right?

when i look at the volume fraction of particles i get reasonable results. the same with the void fraction. but the volume fraction of the fluid phase is not affected. i need help please!

July 14, 2018, 06:14	the volume fraction of water remains 1 although it is partly occupied by particles	#1
synuk75 New Member Miguel Join Date: Apr 2018 Posts: 8 Rep Power: 8	Hi guys, I am trying to simulate a bunch of particles moving in water and gas with a two way coupled model. i have simulated water and gas using eulerian multiphase and the particles using DEM. when i have a look to the volume fraction of water and gas, it is like the particles dont affect the volume fraction of the continuum phases at all. i want that the space occupied by the particles are not share with the continuum phases though. any ideas guys? do i have to specify the multiphase interactions with VOF-lagangian phases or are these interactions assumed when i choose the two way coupling model for the DEM? Thank you very much

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
how to set periodic boundary conditions	Ganesh	FLUENT	15	November 18, 2020 07:09
Mass imbalance problem in multiphase water and steam CFX case	Antech	CFX	1	October 26, 2020 05:03
multiphaseEulerFoam high Courant number	Frenk_T	OpenFOAM	5	November 24, 2016 04:23
Wrong flow in ratating domain problem	Sanyo	CFX	17	August 15, 2015 07:20
mpirun interFoam very stable --> then blows up	ghadab	OpenFOAM Running, Solving & CFD	3	October 27, 2013 11:34

July 17, 2018, 13:57		#2
synuk75 New Member Miguel Join Date: Apr 2018 Posts: 8 Rep Power: 8	Hi guys, i am really struggling with this issue. any idea of how STAR+ account for the particles when modelling the fluids? if the volume fraction of the continuum phase remain 1 despite there are plenty of particles, then the particles dont have any effect on the fluid right? when i look at the volume fraction of particles i get reasonable results. the same with the void fraction. but the volume fraction of the fluid phase is not affected. i need help please!