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Navier Stokes algorithm 2D abnormal behaviour

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Old   April 6, 2013, 06:37
Question Navier Stokes algorithm 2D abnormal behaviour
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Hi, I am beginner to CFD and trying to replicate the Navier Stokes effects by copying below whole algorithm into Java....

Youtube link (2 short slide; up to 39:56):

It solves for b[i,j] and then get pressure[i,j] using poisson equation.
Using p[i,j], it then solves for velocity[i,j]
The above steps is repeated many times to produce this dynamics.

But when I simulate by setting initial velocity[5,5] = 0.1 and run the program, pressure & velocity nearby just grows bigger quickly to infinity.
Actually is there any problem with her algorithm? Is it wrong?
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fluid dynamics, navier stokes

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