invalid results in cfx

January 8, 2009, 14:16

Hi, im currently modelling flow through a cpu fan and i have managed to make the model converege to a residual of 10^-5 The mesh was created in turbo grid with minimal errors and the boundary conditions were specified as an inlet of 101300pa and outlet of 101335pa a tip clearance of 4mm was aso specified... unfortunately the results i am getting seem to be very obscure: a total efficiency of over 100 % shows up in the report.. i can email you the html report file if this helps resolve the problem.

January 8, 2009, 16:15

Hi,

Have you done all the normal checks? Check the sensitivity to convergence, time step size (if transient) and mesh size.

Glenn Horrocks

January 13, 2009, 07:53

tell me number of iterations.

how did you model the fan?

January 8, 2009, 14:16	invalid results in cfx	#1
Antonio frrering Guest Posts: n/a	Hi, im currently modelling flow through a cpu fan and i have managed to make the model converege to a residual of 10^-5 The mesh was created in turbo grid with minimal errors and the boundary conditions were specified as an inlet of 101300pa and outlet of 101335pa a tip clearance of 4mm was aso specified... unfortunately the results i am getting seem to be very obscure: a total efficiency of over 100 % shows up in the report.. i can email you the html report file if this helps resolve the problem.

January 8, 2009, 16:15	Re: invalid results in cfx	#2
Glenn Horrocks Guest Posts: n/a	Hi, Have you done all the normal checks? Check the sensitivity to convergence, time step size (if transient) and mesh size. Glenn Horrocks

January 13, 2009, 07:53	Re: invalid results in cfx	#3
sa Guest Posts: n/a	tell me number of iterations. how did you model the fan?

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