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Pressure Inlet Conditions

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Old   September 25, 2003, 02:55
Default Pressure Inlet Conditions
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If I know the total pressure in inlet and this flow is supersonic, as they say, I need to specify the static pressure.

1) Why?

2) How can I get this static pressure? Just using isentropic relation and the given total pressure with Mach = 1?
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Old   September 25, 2003, 04:18
Default Re: Pressure Inlet Conditions
Chetan Kadakia
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You have to specify the static pressure in order to signify how much of the total pressure is dynamic pressure. You can estimate the dynamic pressure from the velocity, and then subtract the dynamic pressure from the total pressure and you have static pressure.

Po = Ps + Pd Po: Total Pressure Ps: Static Pressure Pd: Dynamic Pressure

Pd = 1/2(ro)V^2 ro: density V: velocity
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Old   September 26, 2003, 05:42
Default Re: Pressure Inlet Conditions
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you can cancle the operation pressure,then input Gauge total pressure and the static pressure.Normally the static pressure can be set equal to the outpressre.You can see an example in the help files.
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