axial fan convergence problem

tongnan · February 23, 2013, 03:25

Hello all,
i am simulating an axial fan with 1 passage (30 degree). The setting and method are as follows:

FLUENT14.5, sliding mesh, transient, pressure-based, compressible, SST-K-Omega, y+ ca. 2, fan 1000rpm, time step 2.5e-05, CFL=1.0. Inlet: mass flow rate 0.6kg/s, Outlet: pressure-outlet

my problem is, after calculation of 6 revolutions, the mass flow rate at outlet oscillates between 0.5-0.7kg/s. Can anyone give me suggestions to improve it?

tongnan · February 25, 2013, 04:16

Hi,
Does anyone have the fan simulation experiences to improve the mass flow unbalance? Thank you!

February 23, 2013, 03:25	axial fan convergence problem	#1
tongnan New Member thomasesel Join Date: Jul 2009 Posts: 13 Rep Power: 17	Hello all, i am simulating an axial fan with 1 passage (30 degree). The setting and method are as follows: FLUENT14.5, sliding mesh, transient, pressure-based, compressible, SST-K-Omega, y+ ca. 2, fan 1000rpm, time step 2.5e-05, CFL=1.0. Inlet: mass flow rate 0.6kg/s, Outlet: pressure-outlet my problem is, after calculation of 6 revolutions, the mass flow rate at outlet oscillates between 0.5-0.7kg/s. Can anyone give me suggestions to improve it? Last edited by tongnan; February 25, 2013 at 04:13.

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February 25, 2013, 04:16		#2
tongnan New Member thomasesel Join Date: Jul 2009 Posts: 13 Rep Power: 17	Hi, Does anyone have the fan simulation experiences to improve the mass flow unbalance? Thank you!