Hey there! Sign in to join this conversationNew here? Join for free

physics help: What is the difference between an ideal and real fluid? Watch

    • Thread Starter
    Offline

    16
    ReputationRep:
    do you also know any examples too?
    • Thread Starter
    Offline

    16
    ReputationRep:
    bump
    • PS Reviewer
    Offline

    18
    ReputationRep:
    (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.
    • Thread Starter
    Offline

    16
    ReputationRep:
    (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?
    • PS Reviewer
    Offline

    18
    ReputationRep:
    (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.
 
 
 
  • See more of what you like on The Student Room

    You can personalise what you see on TSR. Tell us a little about yourself to get started.

  • Poll
    Will you be richer or poorer than your parents?
  • See more of what you like on The Student Room

    You can personalise what you see on TSR. Tell us a little about yourself to get started.

  • The Student Room, Get Revising and Marked by Teachers are trading names of The Student Room Group Ltd.

    Register Number: 04666380 (England and Wales), VAT No. 806 8067 22 Registered Office: International House, Queens Road, Brighton, BN1 3XE

    Quick reply
    Reputation gems: You get these gems as you gain rep from other members for making good contributions and giving helpful advice.