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Continuity equation

  1. Apr 1, 2009 #1
    To solve
    [tex]\frac{\partial\varrho}{\partial t}+\mathrm{div}(\varrho\vec{v})=0[/tex]
  2. jcsd
  3. Apr 1, 2009 #2
    Re: solve

    That is the continuity equation, it expresses the fact that the total time derivative of rho is zero. But if v is also an unknown vector function, then you have four unknowns and one equation so the system is underdetermined.
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