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Flow simulation help--unknown outlet

Question asked by Jimmy Welch on Nov 18, 2014
Latest reply on Nov 21, 2014 by Jared Conway

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I am having difficulty understanding how to set up a model. The first goal is to find the pressure with respect to time of the outlet, which is unknown.

Initial conditions are as follows:

Variable	Inlet	Outlet
Pressure	3000 psia	14.7 psia
Temperature	2500 F	70 F

Transient boundary conditions (dependency) of each of these parameters at the inlet are known, and unknown at the outlet.

It is known that the gas at the outlet is considered high mach number flow.

Does anyone have any suggestions/experience with this sort of situation?

Thanks in advance for any help.

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Jared Conway Nov 19, 2014 1:30 AM
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What is the actual application and what are the real conditions at both inept and outlet?

generally problems are setup as pressure pressure or pressure and flow. The latter seems to be what you need so that your output is the pressure
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- Jimmy Welch @ Jared Conway on Nov 19, 2014 9:01 AM
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  The actual application is essentially a pressure dump from a small pipe into a larger one. Here is a diagram to clarify.
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  - Jared Conway @ Jimmy Welch on Nov 21, 2014 3:22 PM
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    very complicated analysis, there is a tank evacuation example in the solidworks kb that will give you some pointers but you're going to have to try something where you create an initial pressure condition that is different in both regions
    
    but as is, the pressure opening will have to be open to atmosphere or you'll have to look at total pressure to understand what is happening
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Flow simulation help--unknown outlet

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