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Help with a simple pressure vessel model

Posted Jun 6, 2014, 2:51 p.m. EDT Fluid & Heat, Modeling Tools & Definitions, Parameters, Variables, & Functions, Results & Visualization Version 4.4 0 Replies

Jacques Thibault
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I am attempting to model a pair of pressure vessels connected together by a small pipe over time. The two pressure vessels will have different initial pressures with a valve separating them. My aim is to be able to produce a line plot of the average pressure in each vessel as functions of time.
I am using the turbulent flow, k-E physics on y geometry of a pair of cylindrical vessels which taper into a smaller connecting cylinder. I used the initial values domain definition in the physics module to set one of the vessels at 200 psi and the other at 20psi.
When I run the simulation from t0 to 1s in increments of 0.1s I get a pressure plot with the standard appearance, however the pressure values on the data set are not consistent with what is expected.
Both vessels start at around 20 psi and the pressure drops overtime to an unphysical value of -450 psi. Additionally the scale reads a constant value for all of the different colors on the contour plot.
What am I doing wrong? The study settings are all set to the default.

Also how would I go about acquiring the average pressure within the vessel and plotting it over time?
0 Replies Last Post Jun 6, 2014, 2:51 p.m. EDT
COMSOL Moderator

Hello Jacques Thibault

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