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Homework Help: Material derivative?

  1. Nov 30, 2006 #1
    material derivative???

    I have to find the material derivative of the density P for the following steady state flow:

    P = -1-2xy-3z^3 and u = (3x-z, y+3z, x-y)

    I have looked at previous examples but im not sure what i have to do with the density -1-2xy-3z^3 ..... ?

    please help.
  2. jcsd
  3. Nov 30, 2006 #2


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    What's the DEFINITION of the material derivative?
  4. Nov 30, 2006 #3
    I think iv got my head round it now. If someone has a spair few minutes could they check my answer of -8xy +8zy -12xz
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