flat plate boundary layer problem --great influence of viscosity

waynezw0618 · August 10, 2010, 16:04

Dear everyone:

L.J.Jiang · August 10, 2010, 20:04

It seems that there is a convergence problem with this case, k and epsilon were not convergent finally(because the RelTol set is 0.1?). And are you sure the BC. of U on top patch is proper set to fixedValue ? Anyway, it's a interesting but strange case, hope someone give me a bright hint.

Best,
LJ

waynezw0618 · August 11, 2010, 08:25

.

waynezw0618 · August 11, 2010, 08:53

waynezw0618 · August 11, 2010, 14:46

And also fine in CFX

waynezw0618 · August 11, 2010, 14:53

Again the result of Fluent as before is not clear.

and it seems not the problem of turbulence model and wall function as i have turn off the turblence model by using laminar,This strange sensitive phenomenont will also happpened

thanks

su_junwei · August 12, 2010, 03:19

what is your numerical boundary condition for your up patch in the poor case? It seems that it is a fixed value. Have you tried zerogradient or sym boundary condition for this patch?

regards, Junwei

August 11, 2010, 08:25		#3
waynezw0618 Senior Member wayne.zhang Join Date: Mar 2009 Location: Shanghai, Shanghai, P.R.China Posts: 309 Rep Power: 18	. Last edited by waynezw0618; August 12, 2010 at 13:07.

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August 10, 2010, 20:04		#2
L.J.Jiang New Member Jiang Lijun Join Date: Mar 2009 Posts: 14 Rep Power: 17	It seems that there is a convergence problem with this case, k and epsilon were not convergent finally(because the RelTol set is 0.1?). And are you sure the BC. of U on top patch is proper set to fixedValue ? Anyway, it's a interesting but strange case, hope someone give me a bright hint. Best, LJ

August 12, 2010, 03:19		#7
su_junwei Senior Member su junwei Join Date: Mar 2009 Location: Xi'an China Posts: 151 Rep Power: 20	what is your numerical boundary condition for your up patch in the poor case? It seems that it is a fixed value. Have you tried zerogradient or sym boundary condition for this patch? regards, Junwei