Menu

Discussion Forum

New Discussion
Filtra

Note: This discussion is about an older version of the COMSOL Multiphysics® software. The information provided may be out of date.

Discussion Closed This discussion was created more than 6 months ago and has been closed. To start a new discussion with a link back to this one, click here.

Help with a simple pressure vessel model

Posted 6 giu 2014, 14:51 GMT-4 Fluid & Heat, Modeling Tools & Definitions, Parameters, Variables, & Functions, Results & Visualization Version 4.4 0 Replies

Jacques Thibault
Send Private Message Flag post as spam

Please login with a confirmed email address before reporting spam

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 6 giu 2014, 14:51 GMT-4
COMSOL Moderator

Hello Jacques Thibault

Your Discussion has gone 30 days without a reply. If you still need help with COMSOL and have an on-subscription license, please visit our Support Center for help.

If you do not hold an on-subscription license, you may find an answer in another Discussion or in the Knowledge Base.

Note that while COMSOL employees may participate in the discussion forum, COMSOL® software users who are on-subscription should submit their questions via the Support Center for a more comprehensive response from the Technical Support team.

Suggested Content