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    do you also know any examples too?
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    (Original post by mercuryman)
    do you also know any examples too?
    An ideal fluid generally disregards frictional effects and changes in density. It also exhibits the property of irrationality.

    Conversely, a real fluid will feature the opposite of the above.
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    (Original post by pleasedtobeatyou)
    An ideal fluid generally disregards frictional effects and changes in density. It also exhibits the property of irrationality.

    Conversely, a real fluid will feature the opposite of the above.
    THANK you so much!!!

    Can i ask: why is a velocity gradient a necessary condition for fluid dynamics?
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    (Original post by mercuryman)
    THANK you so much!!!

    Can i ask: why is a velocity gradient a necessary condition for fluid dynamics?
    All real flows (no relation to the real of real fluids) must be bounded i.e. the flow domain is finite.

    At the boundary, you can typically apply the infamous no-slip boundary condition - where the flow velocity is zero relative to the wall.

    Hence, disregarding trivial stationary flows, all flows must possess some form of a velocity gradient.
 
 
 
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