Mode summary for the H2 example simulation

Objective

Create an initial steady-state condition from which to start the dynamic run.

Calculate the equivalent lengths of all of the piping sections based on a known steady-state pressure profile.

Observe the dynamic pressure response upon tube rupture.

Source

Specify the flow and pressure.

Specify the boundary pressure.

PipeFlow

Specify the flow and pressure drop of each pipe. Calculate the equivalent length.

PipeFlows also represent the tube bundle pass.

Calculate the flow acceleration from the pressures in the surrounding wall elements and the inertia of the low-pressure fluid.

PipeWall

Mix or split the low-pressure fluid flows.

Calculate the pressure from the dynamic flow balance, fluid modulus, and pipe elasticity.

Channel

No action.

Same as a pipe wall. The channel which receives the high-pressure fluids calculates the pressure based on a volume balance of the low-pressure and high-pressure fluids.

Tube

No action.

Calculate the flow of high-pressure fluid based on critical flow conditions.

Relief Valve

Update the set pressure and mass of the moving parts.

Calculate the acceleration of the disk based on a force balance.

Calculate the flow based on the inlet pressure and position of the relief valve disk.

Sink

Calculate the pressure.

Specify the pressure boundary.