Calculation of bounded scalars

ankgupta8um · June 19, 2006, 01:59

Hi,

I am solving for a turbulent mixing (using LES model) of a passive scalar in a turbulent flow. The scalar has lower and upper bounds of 0 and 1 (as contrained by the boundary conditions). However, when solved, I get values in the computational domain which are like -0.001 and 1.001.
What steps need to be taken in terms of solver settings (or anything else that would help) so as to aviod getting the scalar values out of the bounds ??
Thanks in advance.

Regards,
Ankur

eugene · June 19, 2006, 05:03

You need to use a bounded differencing scheme for the scalar. E.g.

div(phi,gamma) Gauss limitedLinear01 1;

June 19, 2006, 01:59	Hi, I am solving for a turb	#1
ankgupta8um Member Ankur Gupta Join Date: Mar 2009 Posts: 38 Rep Power: 17	Hi, I am solving for a turbulent mixing (using LES model) of a passive scalar in a turbulent flow. The scalar has lower and upper bounds of 0 and 1 (as contrained by the boundary conditions). However, when solved, I get values in the computational domain which are like -0.001 and 1.001. What steps need to be taken in terms of solver settings (or anything else that would help) so as to aviod getting the scalar values out of the bounds ?? Thanks in advance. Regards, Ankur

June 19, 2006, 05:03	You need to use a bounded diff	#2
eugene Senior Member Eugene de Villiers Join Date: Mar 2009 Posts: 725 Rep Power: 21	You need to use a bounded differencing scheme for the scalar. E.g. div(phi,gamma) Gauss limitedLinear01 1;

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