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External forces on Stokes flow

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Old   January 16, 2021, 13:27
Default External forces on Stokes flow
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Leonardo Soto
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Analyzing low Re number flow, Navier Stokes equations take a special form
i can't understand why books always "neglect" gravity, i can think of gravity as some body force per unit mass but if it doesn't appear annymore then what force canceled it?
https://ibb.co/VHMpHLs
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Old   January 16, 2021, 13:48
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Filippo Maria Denaro
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Quote:
Originally Posted by est120 View Post
Analyzing low Re number flow, Navier Stokes equations take a special form
i can't understand why books always "neglect" gravity, i can think of gravity as some body force per unit mass but if it doesn't appear annymore then what force canceled it?
https://ibb.co/VHMpHLs

Gravity is often disregarded also for finite values of Re. It becomes relevant for buoyancy related problems
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