Flow Direction: normal to boundary!!!
My current simulation is the flow between circular flat plate(both plates lie parallel to X-Z plane). The continuous flow of air flows in radially from the perimeter towards the center of the plate where there is the outlet. I specified 'INLET' with zero total pressure, flow direction: normal to boundary condition, and static temp=308K at the inlet position of the domain.
After the computation, I found in CFX-Post that there is the Y-component of velocity at the inlet surface. This could not be possible, couldn't it? 'cause Y axis lie parallel to the inlet surface!!!
Then I change the flow direction at inlet position in CFX-Pre to that
Option = Cylindrical Components
Unit Vector Axial Component = 0
Unit Vector Theta Component = 0
Unit Vector r Component = 1
Option = Coordinate Axis
Rotation Axis = Coord 0.2 (this is Y axis)
However I still have the Y-component of velocity at the inlet surface.
Do anybody know what wrong with this? Does 'flow direction: normal to boundary' really mean that there must be no flow in parallel direction of the surface?
Thank you for your consideration.
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