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empty boundary condition

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Old   February 26, 2023, 08:34
Default empty boundary condition
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Hello,
I have been trying to search the web and the forum to find the mathematical meaning of tthe boundary condition "empty". I have found rather simplified answers like "it does nothing", but I'm interested in the details especially fo a LES case. Does anyone have an idea about its mathematical meaning or where I can find information about it?
Thank you very much.
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boundary condition., two dimensions


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