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BC for 3D to 2D

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Old   March 27, 2006, 14:22
Default BC for 3D to 2D
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Hi all:

I write a 3D flow slover but I want to use it to solve the 2D problem. How do I implement the BC in 3D code? Is symmetry? How to use this boundary condition?
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Old   March 28, 2006, 14:17
Default Re: BC for 3D to 2D
R. Tavakoli
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For using 3D code for 2D case the best way is using periodic BC in the third directioin (pseudo direction), e.g. for FDM code the periodic B.C. in the z direction is as follows

u(i,j,1)=u(i,j,kmax-1) u(i,j,kmax)=u(i,j,2)

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