The forum/short course
The 2nd Forum on Computational Fluid Dynamics (CFD) in Rotary Positive Displacement Machines held at City University on the 5th and 6th September, was well received. Forty-three attendees, from 20 countries, were present, including 11 lecturers from five countries with six coming from City.
The course began with an Introduction to CFD analysis in Positive Displacement Machines. This was followed by detailed investigations into leakage flows and multiphase flows in positive displacement rotary machines and modelling of compressor leakage flows. Specific approaches covered were Grid generation for screw machines, using the differential method and their CFD solution, the Twin Mesh grid generator and CFD. The influence of the grid generation approach and CFD solver upon resolving leakage flows in screw machines was investigated with an analysis of twin screw compressors using CFD and the influence of moving mesh degrees of rotation per time step and about the immersed boundary method. Finally, modern approaches in turbulence modelling were considered.