Hi,

I am working on a venting system for an arrangement of 12 CO2 cylinders (each pressurized to 4500psi).

I am having trouble getting meaningful/sensible results from my CFD simulation. This picture illustrates the system I am working on.

However I’ve simplified the CAD to this (in order to save on meshing time):

Once the CO2 cylinders are activated, they vent off through the big pipe (vertical pipe) at the top of the CAD.

My setup for the CFD goes as follows:

-Simulation: Incompressible Flow (although CO2 is compressible, I chose incompressible as a first iteration to get an idea of the results)

-Mesh all good

-Material: CO2

-Boundary Conditions: Pressure Inlet at the 12 inlets of the CO2 cylinders (set to fixed value 4500psi)

Pressure Outlet at the top (vent) pipe with fixed value of 14.7psi (atmospheric)

-Run Simulation

This is where I end up with absurdly large values for pressure and velocity. Any help on this simulation would be appreciated. (I suspect my issue are the boundary conditions)

Thanks!