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Airfoil start-stop motion (linear) with 20,000 tracers

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Uploaded on Mar 7, 2011

Same as the previous video with the same name but now with 20,000 passive tracer particles to reveal what's going on around the aerofoil and wake. The important thing to observe here is how the bulk of the fluid in the wake region is moving slowly downwards. This nicely illustrates the wake-induced downwash which is responsible for reducing the effective angle of attack of the wing and tilting the resultant force vector rearwards a little giving the induced-drag (an inviscid drag).

Coming soon:

Flapping motion to give static lift / thrust (i.e. without uniform forward motion already in place). This is what flapping wings are really about.

Upgrade to 3D flow ;-D! w00t! This is actually the ultimate purpose of all of this. I want to simulate a spinning propeller (with and without duct) to test my propreitary design algorithm I developed last year. Then couple the propeller flow solver to an optimisation algorithm that can change the surface shape.... and see what comes out ;-)))

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