DPM problem in a coupled analysis

Luigi0

Hi,

I have a problem with discrete phase modeling in a coupled analysis (Two way FSI analisys): "Particles lost outside the domain while spanning over partitions". It's strange because before running the coupled analysis, I run an analysis only in fluent with the same settings and particles are tracked in a right way.

The fluid domain is a parallelepiped, with one inlet and one outlet and the flow is laminar. There is a single injection and the particles are modeled as uncoupled dpm.

Are there special settings that I have to check before modeling dpm in a coupled analysis?

Thanks

Rob

How much does the mesh change during the structural part? Given the way particles are handled I can see some being lost if the geometry is no longer present following an update.

Luigi0

Thanks Rob for your interest.

I don't understand when you say "how much does the mesh change during the strucutral part", could you clarify it? Thanks. However, I try with a different injection type: I choose "release from surface" and it works, but for my purpose I need single or group injection.

Rob

You said you were doing FSI so that implies some change in geometry.

For point injections etc make sure they're a cell or so into the fluid domain, with scattering & numerical errors it's very easy to have an injection that's just outside the fluid domain.

Luigi0

Ok, the change in geometry is very small, the displacements sent from structural to fluent are in the order of nanometers.

Selecting release from surface, it works, but I have 10 cells on the inlet, so I have 10 streams. Is it possible to release particles only from one or two cells from the inlet for example?