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Question about boundary condition of 2D Burgers equation

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Old   January 29, 2012, 21:55
Default Question about boundary condition of 2D Burgers equation
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I would like to ask boundary condition of 2D Burgers equation.
I consider following equation.

U_{t} + ( (1/2)U^2 )_{x} + ( (1/2)U^2 )_{y} = 0

with the Riemann initial value

U(x,y,0)= 2.0 (x<0), 1.0 (x>0)

I guess that left and right boundary value is 2.0, 1.0 respectively.
But what is the top and bottom boundary condition?
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