# Need Help! High pressure Gas discharge from tank to tank through a pipe

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 March 6, 2012, 17:19 Need Help! High pressure Gas discharge from tank to tank through a pipe #1 New Member   Arthur Join Date: Mar 2012 Posts: 1 Rep Power: 0 Hello, I am a starter of fluent and I need to model the methane discharge/depletion from a high-pressure vessel to a low-pressure one through a thin long pipe. Choked flow is likely to happen. The system is closed. I wonder can anyone guide me to solve this problem. I am current doing my PhD and I am an experimental guy but I need to model this experiment via fluent in order to graduate. Here is the problem description: Initial pressure at the upstream tank: 2000psi. Initial pressure at the downstream tank: 500psi. Volume of the upstream tank: 1cc. Volume of the downtream tank: 15cc. length of the pipe: 8ft Diameter of the pipe is 0.005in, which is 100 times smaller than the in/out ports of the tanks. When t=0, the valve of the upstream tank open to let the gas deplete to the dowstream tank. I need to simulate the pressure change with time in the downstream tank as well as modelling the flow propagation through the pipe. Thank you very much.

 April 2, 2012, 14:58 #2 Senior Member   Ehsan Asgari Join Date: Apr 2010 Posts: 473 Rep Power: 18 dear Arthur, first off you should model your geometry using some grid generation tool,e.g. Gambit. then you should take your geometry into Fluent. Since you haven't cleared I ask: Have you modeled the geometry? When you read the geometry in Fluent, be careful about the dimension of your case (2-D or 3-D). Fluent initially asks you and you should select it carefully. You mentioned you know the inlet/outlet pressure, so you should use Pressure-Inlet Boundary condition. Since you are working with high pressure, you should select ideal-gas in material panel and in advance, select density-based solver in Solver panel and select unsteady mode in addition due to your problem is unsteady. Good luck

 June 16, 2017, 10:22 Same Doubt #3 New Member   Ram Prakash Join Date: Jun 2017 Posts: 3 Rep Power: 9 Me to trying to solve same type of problem with propane leaking from a tank at 5 bar into a room containing air. And i want to have the propane as ideal so that its density changes with the pressure. Please help me to choose the model in which it should be done.

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