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Old   March 5, 2011, 17:58
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M. Nabi
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Dear all;

I am calculating the skin drag and form drag from my LES code for a channel with non-flat bed. I calculate the skin drag by log-law. How can I calculate the form drag? For the form drag,

F= \int_S p.\vec n \, ds

and in the stramwise direction becomes

F= \int_S p n_x \, ds

But it doesn't give me the correct answer. Has anybody any idea?

Thanks

Nabi
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