Multiphase simulation failing to model sphere-filled composite DEM particle motion
 

Hi everyone,

I'm running a Lagrangian Multiphase DEM simulation of a single solid phase mixed in water. My solid phase is a sphere-filled composite particle in the shape of a spheroid:

Attachment 80600

I created an injector for my solid phase at the middle inlet of my geometry (shown in the bottom image) so that the phase is moving in the positive z-direction. When I run the simulation, it seems that the individual spheres in my sphere-filled composite particle model are dispersed in the XY-plane like so (I've counted up the spheres and they always match the number of spheres I used for the composite particle, no matter what I set that number to). :eek: Has anyone seen anything like this before? :confused:

Attachment 80601

Cheers

it looks like your particles are not even getting into your flow domain, as you say they should be heading in the +ve z direction so something bad is happening.

i would back track and inject some simple singles spheres and get that sorted before tracking down the "breakup" issue which is not possible with composite particles anyway.

Good suggestion, sadly didn't improve anything. One sphere works fine but as soon as I ass more they spread out in the XY plane. I tried setting the injector input by defining a presentation grid with center inside of the flow region further upstream, rather than injecting the particles from one of the faces, but still have the same problem. :(

[UPDATE: FIXED]

For anyone interested this issue is actually addressed in the Siemens support center. The solution is to go to your Scalar Scene properties and, under, "Expert", go to "Point Scale Mode" and set to "Particle Model". This fixed it for me.