[Velocimetry]

I am trying to model a screw compressor with compressible air as the fluid medium. I have a case where the contact between the mating parts in the gears is very minimal - almost zero.

Star CCM has overset meshing, and also employed for Gears in one of their tutorials, They also mentioned, that it is not recommended to employ gap interface for gear mating.

Has anyone had any success with using star ccm for screw compressor, if so do you know of any solution methodology? Are there any other alternatives that you guys moved to?

[ashokac7]

Originally Posted by Velocimetry

I am trying to model a screw compressor with compressible air as the fluid medium. I have a case where the contact between the mating parts in the gears is very minimal - almost zero.

Star CCM has overset meshing, and also employed for Gears in one of their tutorials, They also mentioned, that it is not recommended to employ gap interface for gear mating.

Has anyone had any success with using star ccm for screw compressor, if so do you know of any solution methodology? Are there any other alternatives that you guys moved to?

In Overset mesh it is recommended to have 2-3 layers between component mesh and boundary of background mesh. So overset in screw compressor might not be a great idea. Search for compatibility of CFX for this problem.

[Velocimetry]

I did. They suggested me to come to Star CCM forum.

With CFX one needs twin mesh to properly mesh the mating region

[JBeilke]

You might try FlowVision. They have a special gap model for this purpose.

https://fv-tech.com/en/flowvision-te...gies/gap-model