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simulate a gas filled pack

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Old   May 10, 2016, 14:30
Exclamation simulate a gas filled pack
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hi my friends
i want to simulate a gas filled pack like a balloon and i want the inside volume of the deformed shape.
my problem is to simulate "gas pressure" inside and outside.

i was suggested to use "static structural" . but when i insert pressures , pack deforms unexpectedly(the directions and magnitudes of pressures of each position should change as pack deforms but they don't !)

i think this problem occurs because of ignoring pack flexibility and bad simulation of gas pressure.

also how can i get inside volume easily , because i should do that several times!!(i know how to get the volume by "fill" in geometry.)

i'm new to ansys and sorry if the question is so simple !

thanks for your suggestions...
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deformed geometry, inside volume, static structural

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