Should I consider compressibility in fan simulation?

ivanbuz · May 20, 2011, 11:28

Hi all,

The fan has a diameter of about 0.8m and speed at 3000rpm. I want to get the fan power, static pressure rise across the fan, and fan efficiency. Should I use compressible flow or incompressible flow? How much difference will that make?

Thanks a lot,

Ivan

ghorrocks · May 21, 2011, 07:56

Why not run both and find out for yourself?

But in general when the Mach number is under 0.3 the difference between compressible and incompressible flow is under 1%.

May 20, 2011, 11:28	Should I consider compressibility in fan simulation?	#1
ivanbuz Member Ivan Join Date: May 2009 Posts: 85 Rep Power: 18	Hi all, The fan has a diameter of about 0.8m and speed at 3000rpm. I want to get the fan power, static pressure rise across the fan, and fan efficiency. Should I use compressible flow or incompressible flow? How much difference will that make? Thanks a lot, Ivan

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May 21, 2011, 07:56		#2
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,970 Rep Power: 145	Why not run both and find out for yourself? But in general when the Mach number is under 0.3 the difference between compressible and incompressible flow is under 1%.