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For an external flow like this, one needs to determine where to place the outer boundary. For this simulation a A rectangular domain will be used for this simulation. The height of the rectangular domain will be determined by the expected boundary layer thickness. For a flat plate boundary layer, one can use the following approximation to find the boundary layer thickness.



When x = L, = 0.05m. The height of the domain will be set to ten times the boundary thickness. Thus, the height of the boundary will be set to 0.5m. The following figure shows the dimensions of the domain, and the boundary labels which will be used to set the boundary conditions.

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