pressure boundary
 

Does pessure boundary mean new fluid flows into the computional domain under the influence of pressure?

Hi~
The fluid fraction determines what fluid is entering. If you have a tank with fluid and void and you set the top boundary to pressure and leave the fluid fraction to 1 then fluid 1 will enter the tank. If you set the fluid fraction to zero and a pressure boundary then the void will use that pressure and no fluid will enter the domain. However if you are using two-fluid then then having fluid fraction as 0 will allow fluid 2 to enter the domain. So fluid fraction of 1 for fluid 1 and fluid fraction 0 for void/fluid2.:)
MC

Thank you,melissa!
I understand.

Hi Melissa,

Would this mean that for a casting simulation you would want to include some void region (considering that the shot sleeve is not completely full of material)?

Nikesandman,

referring to your original post, you can include the shot sleeve in your simulation to replace the inlet boundary. The plunger can have a time-dependent velocity just like in the real machine.