aerofoils - 2024 ACF Winter

Question

Modeling these devices with a horseshoe vortex inaccurately implies there is uniform circulation. For 10 points each:

[10m] Name these devices that have positive camber if their top end is more curved than the bottom. The effectiveness of these devices decreases if their angle of attack is too high.

ANSWER: aerofoils [or airfoils or airplane wings; prompt on airplanes]

[10e] During a stall, the aerofoil’s coefficient of this force drops precipitously. The Bernoulli principle explains how this force is generated by a pressure difference on both sides of an airplane wing.

ANSWER: lift [accept lift coefficient]

[10h] The lift on an aerofoil equals circulation times rho-infinity v-infinity, per a theorem named for this man and Nikolai Joukowski. This man is the second namesake of a fourth-order method of solving ODEs that incorporates the initial, final, and two midpoint slopes.

ANSWER: Martin Kutta [accept Kutta–Joukowski theorem or fourth-order Runge–Kutta methods]

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Summary


2024 ACF Winter at UC Berkeley	2024-11-16	Y	3	20.00	67%	100%	33%
2024 ACF Winter at Clemson	2024-11-16	Y	8	16.25	88%	38%	38%
2024 ACF Winter at Northwestern	2024-11-16	Y	9	20.00	89%	67%	44%
2024 ACF Winter at Ohio State	2024-11-16	Y	7	15.71	86%	43%	29%
2024 ACF Winter at Online	2024-11-16	Y	8	13.75	88%	38%	13%
2024 ACF Winter at UBC	2024-11-16	Y	3	16.67	100%	33%	33%
2024 ACF Winter at Oxford	2024-11-16	Y	11	20.91	100%	73%	36%
2024 ACF Winter at Brandeis	2024-11-16	Y	10	14.00	80%	30%	30%

Data


Berkeley B	Berkeley A	10	0	0	10
Stanford A	Stanford L	10	10	0	20
Auburn A	Georgia Tech D	10	10	10	30
Clemson A	Tennesse B	0	10	0	10
Northwestern A	UIUC C	10	10	10	30
Notre Dame	Indiana A	10	10	0	20
Michigan State A	Michigan A	10	10	10	30
Michigan B	CWRU D (DII)	0	10	0	10
Arkansas	Texas B	0	10	0	10
Vassar A	Central Oklahoma	0	10	10	20
Bristol A	Cambridge B	10	10	0	20
Cambridge C	LSE A	0	10	10	20
Brandeises Brew	Yale C	0	10	0	10
MIT A	Brown A	10	10	0	20
WashU C	UIUC D	10	10	0	20
CWRU A (UG)	CWRU C (UG)	10	10	0	20
Kenyon A	OSU C	0	10	0	10
Michigan C (UG)	Michigan State C (UG)	0	10	0	10
CWRU B (UG)	Michigan D (DII)	0	0	0	0
Pitt A	Ohio State A (UG)	10	10	10	30
Cambridge A	Imperial A	0	10	10	20
Durham A	Cam D	10	10	0	20
Bristol B	Edinburgh	10	10	0	20
Imperial B	Oxford B	10	10	10	30
Manchester	Oxford A	10	10	10	30
Southampton A	Birmingham	10	10	0	20
Vanderbilt	LSE B	10	10	0	20
Southampton B	Warwick A	10	10	0	20
Warwick B	Durham B	0	10	0	10
A Brandeis Supreme	Clark A	0	10	0	10
Boston University A	Amherst A	0	10	0	10
Diamond Brandeis	Bowdoin B	0	0	0	0
Yale A	Carabrandeis	10	10	10	30
Harvard A	Northeastern A	10	10	10	30
Tufts A	Tufts B	0	10	10	20
Williams A	Bowdoin A	0	10	0	10
Boston University B	Yale B	0	0	0	0
Berkeley C	Stanford M	10	10	10	30
Georgia A	Alabama A	0	0	0	0
Emory A	Auburn C	0	10	0	10
Georgia Tech B	Georgia Tech E	10	10	10	30
Auburn B	Georgia Tech F	10	10	0	20
South Carolina A	Emory B	0	10	10	20
Tusculum A	Georgia Tech C	0	10	0	10
UIUC B	Indiana B	10	10	10	30
Miami	Purdue B	0	10	0	10
WashU B	Purdue A	10	10	10	30
Purdue C	UChicago A	0	10	0	10
Purdue D	WashU D	10	0	0	10
UChicago B	SIUE A	0	10	10	20
Texas A	Colorado College	10	10	0	20
Iowa	Texas D	0	10	0	10
NYU B	McGill E	0	10	0	10
Missouri	Mississippi State	10	0	0	10
Oregon State	Ole Miss	0	10	0	10
NYU A	Texas C	10	10	0	20
UW B	Alberta	10	10	0	20
UBC B	SFU	0	10	0	10
UW A	UBC A	0	10	10	20