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Old   September 2, 1999, 05:50
Default streamlines
  #1
ulrich
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hi there, i want to calculate streamlines from a given velocity field. where can i get information on the boundary conditions of the laplace equation thank you ulrich
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Old   September 2, 1999, 06:26
Default Re: streamlines
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NW
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At the wall you can set the value of stream function equal zero.
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Old   September 2, 1999, 08:47
Default Re: streamlines
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ulrich
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ok, this is evident (thank ypo anyway).

if i have symetry or von neumann boundary conditions, i impose the gradient of the stream function; unfortunately my conjugate gradient algorithm does not converge in these cases.
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Old   September 2, 1999, 10:58
Default Re: streamlines
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Hongjun Li
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You don't have to solve the Laplace eq. if you already knew the velocity field (assume 2-D incompressible). You can simply integrete the velocity along the grid line from the solid boundary to get the stream function(sf = int[udy-vdx])at each grid point. This may not be very accurate, but certainly very simple.
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