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Old   March 14, 2005, 04:30
Default Zero-Grad Pressure
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Hi all,

I just have a single simple question, which I couldnt find the answer in the user guide. in the pressure BC option, what does it mean by 'zero-grad' for the turbulence switch? when are we supposed to use it as oppose to k/Epsilon? Thanks

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Old   March 14, 2005, 11:16
Default Re: Zero-Grad Pressure
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when u dont know the turbulence intensity or k/e value at any boundary (prefarably outflow) at that position u can give zero-grad so that those value is calculated from er interior solution domain or computational domain.
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Old   March 15, 2005, 04:06
Default Re: Zero-Grad Pressure
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So, if star can calculate those values for us, whats the point of inputting the parameters to begin with?

anyway, thanks somnath for your reply
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Old   March 15, 2005, 04:48
Default Re: Zero-Grad Pressure
Anton Lyaskin
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Usually you use zero-grad option it you have "outlet" pressure boundary and specified turbulence parameters if you use "inlet" pressure boundary
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