Problem with boundary type

October 10, 2005, 11:13

Hi

I am modelling a mould...in which the fluid is static..Can someone help me with what type of boundary type should be defined for such a fluid?

October 11, 2005, 06:44

Hi

For which equation do you need boundary condition. If it is N-S, then boudnary conditions will simply be no-slip at boundary. You can directly use Dirchilet condition. If it is Temperature boundary condition then you have to use either Neumann, or Robin's; Robin's will be better.

Vinod Dhiman

moun139 · May 27, 2012, 04:19

Hi,

I want to introduce robin's boundary condition ,i wrote a UDF profile wich decrib it .When i interpreta it and hook it at wall boundary condition ,after lunch iteration ,fluent display : Error: Floating point error: invalid number ,and there is note a coenvergence.

Please what is the problem ,can you help me?

thx

October 10, 2005, 11:13	Problem with boundary type	#1
Shanti Guest Posts: n/a	Hi I am modelling a mould...in which the fluid is static..Can someone help me with what type of boundary type should be defined for such a fluid?

October 11, 2005, 06:44	Re: Problem with boundary type	#2
Vinod Dhiman Guest Posts: n/a	Hi For which equation do you need boundary condition. If it is N-S, then boudnary conditions will simply be no-slip at boundary. You can directly use Dirchilet condition. If it is Temperature boundary condition then you have to use either Neumann, or Robin's; Robin's will be better. Vinod Dhiman

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May 27, 2012, 04:19		#3
moun139 New Member moon Join Date: Feb 2012 Posts: 26 Rep Power: 14	Hi, I want to introduce robin's boundary condition ,i wrote a UDF profile wich decrib it .When i interpreta it and hook it at wall boundary condition ,after lunch iteration ,fluent display : Error: Floating point error: invalid number ,and there is note a coenvergence. Please what is the problem ,can you help me? thx