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why this type of bc are there?

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Old   January 26, 2007, 10:33
Default why this type of bc are there?
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kunder
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I have query that, why for comp flow we are using mass flow at inlet and for external flow we can use velo at inlet? pls reply Thanks

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Old   January 26, 2007, 14:12
Default Re: why this type of bc are there?
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ag
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Maybe because in a steady flow computation you eventually want to have mass in = mass out for the internal case, and for an external flow case we don't have that as a hard and fast restriction (i.e. mass can leave along multiple parts of the farfield boundary), and the flow at the boundary can adjust to account for global conservation.
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Old   January 26, 2007, 14:51
Default Re: why this type of bc are there?
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ag
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Also note that typically these are among the easiest and most natural quantities to define at those particular boundaries from a problem definition perspective.
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