Reply To: FLUENT MultiPhase – floating point exception 6hrs into calculations

[Rob]

Mesh: yes, and you can also see the jet diffusion from the inlet. 

Auto range is "correct" in that it's picked up the high and low values. It's just not overly useful for what you're wanting to know. 

Meshing in CFD isn't quite as straightforward as you may have thought. We have to resolve the geometry (easy, we can see that) but also where we think flow gradients might be. In this scenario it's more difficult as the flow will produce the gradients more so than the geometry: I've modelled a few cyclones and vortex amplifiers so know what to look for. Rather than going back to meshing (not a bad idea to do that but leave that for later) have a look at region adaption. Use that to refine the region around the vortex core, and continue the steady run from the above result: that will show you more of what's going on fairly quickly.