Fan Computations

Keen

Hi,

I have been running MRF computations of a 2-bladed fan in a duct. The fluid is air. The Mach numbers relative to the blade are significant (i.e. 0.5-0.6) only in a small region in the vicinity of the blade tip.

I am unsure as to whether to specify constant density or ideal-gas model in the "Materials" menu.

Will selecting ideal gas compromise the accuracy in the regions (which form the bulk of the computational domain) of low Mach numbers?

Basically I would like to know which would be the more accurate of the two options: constant density or ideal gas?

Looking forward to advice.

Thanks in advance

K I Chan