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Old   May 27, 2009, 23:46
Default pressure boundary
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linfangcai
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Does pessure boundary mean new fluid flows into the computional domain under the influence of pressure?
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Old   June 1, 2009, 11:01
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MC
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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.
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Old   June 3, 2009, 21:03
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Thank you,melissa!
I understand.
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Old   October 20, 2009, 01:38
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Sean
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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)?
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Old   October 21, 2009, 00:15
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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.
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