[gpjg]

Hi,

I am attempting to simulate a sphere settling under gravity in a viscous fluid (water for now) using the Macroscopic Particle Method (MPM) in Fluent 2023 R1.

I managed to set up a sphere falling in air by watching a good video posted on the YouTube channel (just to avoid posting external links, the title is [TUTORIAL] Macroscopic particle Model di Ansys Fluent (MPM)) mentioned by the user Erasmus in the thread Macroscopic particle model (MPM) , but when I try to set up spheres falling in water with steps from another video posted on the same YouTube channel, the spheres either don't move or the behaviour is unphysical. Also, the continuity residuals are very large.

The geometry I use is very similar; it is slightly simplified to be just a rectangular box without the reduction in size in the middle of the domain, but uses the same overall dimensions from the video. The mesh I am using has very similarly sized tetrahedral elements as well. I am following the steps as closely as possible, but I still cannot replicate the behaviour from the video.

I should note that I had to replace the animation setup from the videos with the more current "scene" setup.

Would anybody have any advice on this issue?

Thanks!