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- Thread starter abcdefg10645
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- #1

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- #2

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When I studied the fluid dynamic , I saw a quite hard equation (typed in attached file) ,

I don't know how to prove it , maybe there's a somehow relationship between this eq with Gauss's Divergence Theorem ...

Can anyone help me ?

Your equation is a relation between vectors, but you can prove it by considering each vector component separately and applying the divergence theorem.

- #3

Pythagorean

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Iirc, you can get at it from conservation of mass:

dm=o

d(pV) =0

(product rule)

etc...

dm=o

d(pV) =0

(product rule)

etc...

- #4

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Iirc, you can get at it from conservation of mass:

dm=o

d(pV) =0

(product rule)

etc...

Well,I cannot fully understand what the term "etc" mean , could you be more explicit , or can you just type the solution to this annoying question ?

Thanks again if I get any reply~

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