Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Homework Help: Lagrangian motion (force on a plate)

  1. Nov 28, 2006 #1
    I am trying to solve this problem using lagrangian motion but I have no idea how to use it.

    It can be solved using mass conservation and force momentum equation but we are supposed to solve it with continuity.

    How would I go about this?

    Continuity:

    [tex]\frac{ Dp }{Dt} = \delta u / \delta x + \delta v / \delta y + \delta w / \delta z[/tex]

    Now the problem is this:

    Calculate the drag force acting on the flat 2m wide plate. Outside the viscous region the velocity is uniform. Use density = 1.23kg/m^3

    What I can say is that, [tex]\frac{ \delta p }{\delta t} = 0[/tex]

    PIC
     

    Attached Files:

    Last edited: Nov 28, 2006
  2. jcsd
  3. Nov 29, 2006 #2
    Nobody with a clue on this one?

    The exact question states:

    b) Solve the problem using a control volume with the upper boundary a streamline (no mass flux crosses a streamline)
     
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook