Hi again guys. Made fantastic progress since your great help and I have my first complex Boolean Fragment Mesh model. below:
As I hope I've shown, the complex body has four inlets and one outlet and represents the internal flow region of the device. The axial inlets enter the device tangentially and set up a strong vortex that leaves via tapered exit and outlet, still spinning.
A simpler version with no tapered outlet tube (diffuser) worked reasonably well with a mesh base element size of 1.7mm. It gave me results that I could graph to show diametric pressure profiles.
This seemed to be making good sense so I moved onto the above extended model and it will not work at all, I can only get about 100 iterations before failure.
I don't expect explanations at this time and I'm still working hard on understanding it all, but I have one question.
I don’t see this model as over complex and would expect it to be successful, but my concern is the fine mesh in the exit pipe. I need to expand axially the mesh in this region to reduce the number of nodes but haven’t been able to do that yet. SnappyHexMesh is what I need but will not work for the Boolean Fragment. Would you agree that this is what I need to do?
Sorry for the long post so going to leave it here and carry on searching but thanks in anticipation.
Model is too large to post here but will try again