Page History

4/11/2008

Optimum mesh. Decided to solve the turbulence viscous layer by refining the mesh until we get yplus less than 5 at the wall. (cell of about 30,000 is good enough to resolve the layer)

Decided on the single bend. Use h = 1.5w and compare with h = 1w
w = baffle spacing

For h = 1.5:
Get Pressure coefficient loss of 3 across the bend
Lots of stagnant flow at the bottom corner
Yplus at wall less than 5

For h = 1;
Pressure coefficient loss of 3.21 across the bend
Yplus less than 5

Explanations:
Lower h has higher pressure coefficient loss. The fluid need to flow through constricted region which increase the frictional losses as compared with the flow through bigger h?

3/7/2008
Boundary layer
first row = 0.0015
growth factor = 1.13
rows = 6
Depth = 0.0124841

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