Low Reynolds Number Turbulent Flow Near Wakes
Experiment by T.D Gough and P.E Hancock
Description
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Measurements have been made in two low-Reynolds number wakes, one symmetrical and one
asymmetrical with a boundary layer thickness ratio of 1.9. The geometry and flow
conditions were matched as closely as possible to a large eddy simulation study using a
rectangular variable density mesh. If the smallest mesh size is to remain an acceptable
multiple of the smallest scales the computation time will increase with Reynolds number
roughly as (Ue
/
)3,
where is the momentum thickness and Ue
the free-stream velocity. It was decided that Ue/
should not exceed about 600. Given that turbulence is only naturally sustainable
for Reynolds numbers greater than about 300 this Reynolds number range imposed severe
constraints on the experiments, in particular the tripping of the boundary layer so as to
be free of residual trip effects.
The trailing edge thickness, t, was about 0.1 of the boundary layer thickness,
, at the trailing edge. This is larger than
typical of an aircraft wing but comparable to that of a wing element or blade.
Experimental Details
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Previous and Reference Numerical Solutions
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References
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