Hello,

I am currently doing a project which involves internal flows in a vessel.

I want to know if Flow Simulation considers the vessel initially empty or if it assumes the vessel is already completely filled with the flowing fluid when the solver begins the calculations.

I'm new to Flow Simulation and up to now i have not come across any piece of information that can help me on that.

Your help or suggestions are very much appreciated.

Thanks in advance

Tom

Tom -

when you setup a flow simulation and define the initial conditions (fluid, temperature, pressure) it fills in all of the fluid cells with this information.

If you were to define a given volume as at zero absolute pressure then it would assume it empty, otherwise the initial conditions define the cell default state.

Just like if you define a BC as having a velocity, it initially sets all other fluid cells to zero velocity (again, unless you specify a non-zero initial condition).