How to get data I need from a converged flowfield?

September 19, 2003, 00:10

Dear All,

I need to get the viscous dissipation term: (shear stress*(partial u_i/partial x_j)) which appears in the energy equation. (See eq. (1-10) the Star-Cd ¡§Methodology¡¨ book p. 1-3) from a covergent flowfields. How should I do? Thanks for reply.

September 20, 2003, 10:22

You can do it either in PROSTAR or within the user subroutine POSDAT.F, whereas the most accurate answer will be obtained with the user subroutine. You have to declare a passive scalar in PROSTAR to will be used for storing the calculated value of the dissipation term. Using POSDAT.F, you calculate the term you need with the appropriate STAR subroutines for gradient calculation (ask your local support office to help you in this matter). Then dump the value calculated in the T array at the place reserved for the dummy scalar you had defined previously.

September 19, 2003, 00:10	How to get data I need from a converged flowfield?	#1
Ko Guest Posts: n/a	Dear All, I need to get the viscous dissipation term: (shear stress*(partial u_i/partial x_j)) which appears in the energy equation. (See eq. (1-10) the Star-Cd ¡§Methodology¡¨ book p. 1-3) from a covergent flowfields. How should I do? Thanks for reply.

September 20, 2003, 10:22	Re: How to get data I need from a converged flowfi	#2
4xF Guest Posts: n/a	You can do it either in PROSTAR or within the user subroutine POSDAT.F, whereas the most accurate answer will be obtained with the user subroutine. You have to declare a passive scalar in PROSTAR to will be used for storing the calculated value of the dissipation term. Using POSDAT.F, you calculate the term you need with the appropriate STAR subroutines for gradient calculation (ask your local support office to help you in this matter). Then dump the value calculated in the T array at the place reserved for the dummy scalar you had defined previously.

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