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About shear stress, need help!!

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Old   August 21, 2006, 21:36
Default About shear stress, need help!!
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Dong Wenchao
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Dear all,

I want to define the Marangoni stress at a liquid free surface boundary. Marangoni stress is written as follows: del(sigma)=d(sigma)/dT*del(T).

In FLUENT's UDF, we can use cell variations macros to define del(T). For example, dT/dx=C_T_G(c,t)[0].But for face variations, FLUENT don't define corresponding macros, i.e., there is not F_T_G(c,t)[0].

So, I want to know how to define del(T) at a face.

In addition, I want to know how to define cell variations macros in cylindrical coordinates. For example, dT/dr=?

Thank you in advance!
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Old   August 23, 2006, 07:38
Default Re: About shear stress, need help!!
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Dong Wenchao
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Who can ask my questions?

Thanks ahead!
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