A prog that could simulate screw compressors?

Leo

I´m looking for a tool that can simulate steady-state or transient (prefered) simulation of a screw compressor with moving mesh capabilities.The problem comes when the rotor´s meshes starts to superpose , i don´t know other soft than Polyflow capable of doing this . If anyone has any kind of experince with this knid of simulations or knows about a soft with this capabilities , i´d like to hear it .

Thanks in advance .