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Initial cinditions for incompressible fluid

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Old   December 22, 2005, 09:46
Default Initial cinditions for incompressible fluid
  #1
Vladimir Fuka
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Hello! I'm developping a simple code for incompressible fluid. I have one problem. How could I get initial condition that satisfies continuity equation, boundary conditions and compatibility condition? I have not found anything about that anywhere. Or can I use Ui = 0 everywhere when I have nonzero Dirichlet condition on U1 at inlet?
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Old   December 22, 2005, 14:05
Default Re: Initial cinditions for incompressible fluid
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srinath
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Why don't you use the free stream condition as the initial condition i.e ui=U_inf, vi=0,wi=0 U_inf is the velocity at the inlet also.
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Old   December 23, 2005, 10:15
Default Re: Initial cinditions for incompressible fluid
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Vladimir Fuka
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Thanks! I was not sure if they are correct if have noslip BC in domain also. I am beginner and in my books (Wesseling, Ferziger - Peric ...) was not much about that.
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Old   December 23, 2005, 11:45
Default Re: Initial cinditions for incompressible fluid
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diaw
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Vladimir,

Solution convergence can often be a little easier if you 'pre-fill' the fluid domain with a prescribed initial velocity. It also leaves less work for the solver to perform.

diaw...

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