Experimental Determination of Unsteady Aerodynamic Coefficients and Flutter Behavior of a Rigid Wing

2010 ◽  
Author(s):  
Ji-Eun Song ◽  
Seung-Jin Song ◽  
Taehyoun Kim
Keyword(s):  
Experimental Determination ◽  
Aerodynamic Coefficients ◽  
Unsteady Aerodynamic ◽  
Rigid Wing

Aerodynamic and surface comparisons between Telstar 18 and Brazuca

2018 ◽  
Vol 232 (4) ◽  
pp. 342-348 ◽  
Author(s):  
John Eric Goff ◽  
Sungchan Hong ◽  
Takeshi Asai
Keyword(s):  
Experimental Determination ◽  
High Speed ◽  
Aerodynamic Coefficients ◽  
World Cup ◽  
Drag Coefficients ◽  
Soccer Ball ◽  
Critical Speeds ◽  
Aerodynamic Properties

Aerodynamic coefficients were determined for Telstar 18 and Brazuca, match balls for the 2018 and 2014 World Cups, respectively. Experimental determination of aerodynamic coefficients prompted the development of computationally determined soccer ball trajectories for most launch speeds experienced in actual play. Although Telstar 18’s horizontal range will be nearly 10% shorter than Brazuca’s horizontal range for high-speed kicks, both Telstar 18 and Brazuca have similar knuckling effects due to nearly equal critical speeds and high-speed drag coefficients that differ by less than 10%. Surface comparisons suggest why aerodynamic properties for the two World Cup balls are so similar.

Experimental determination of a state equation for dissipative granular gases

1999 ◽  
Vol 96 (6) ◽  
pp. 1111-1116 ◽  
Author(s):  
E. Falcon ◽  
S. Fauve ◽  
C. Laroche
Keyword(s):  
Experimental Determination ◽  
State Equation ◽  
Granular Gases
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