Aerodynamic characteristics and flow pattern of a golf ball with rotation

Aoki, Katsumi; Muto, Koji; Okanaga, Hiroo

doi:10.1016/j.proeng.2010.04.011

Cited by 44 publications

(21 citation statements)

References 1 publication

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“…The critical Reynolds number depends also on the free stream turbulence [6] or on the roughness of the obstacle. A classical example is the presence of dimples at the surface of a golf ball that decrease the critical Reynolds number by a factor of ten, what explains their surprisingly long trajectories [7,8]. Drag crisis is usually described for a symmetrical object, for which no permanent lift force is measured, although strong fluctuating transverse forces have been observed [9].…”

Section: Sharp Transition In the Lift Force Of A Fluid Flowing Past Nmentioning

confidence: 99%

“…Drag crisis is usually described for a symmetrical object, for which no permanent lift force is measured, although strong fluctuating transverse forces have been observed [9]. Permanent lift can however be generated on such a symmetrical object if it is spinning, a possibility largely used in ball sports [7,8], or if it moves close to a wall or inside a nonclassical fluid as granular media [10]. On the other hand, strong lift and low drag are usually achieved with slender bodies, e.g.…”

Section: Sharp Transition In the Lift Force Of A Fluid Flowing Past Nmentioning

confidence: 99%

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Sharp Transition in the Lift Force of a Fluid Flowing Past Nonsymmetrical Obstacles: Evidence for a Lift Crisis in the Drag Crisis Regime

et al. 2016

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Section: Sharp Transition In the Lift Force Of A Fluid Flowing Past Nmentioning

confidence: 99%

Section: Sharp Transition In the Lift Force Of A Fluid Flowing Past Nmentioning

confidence: 99%

Sharp Transition in the Lift Force of a Fluid Flowing Past Nonsymmetrical Obstacles: Evidence for a Lift Crisis in the Drag Crisis Regime

et al. 2016

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“…Further studies have been performed using a combination of Reynolds-Averaged Navier-Stokes (RANS) [24,25], LES [1,17,18], DNS [4,23], and wind tunnel experiments [1,7]. Li et al proposed a link between small-scale vortices created at the golf ball dimples and a reduction in side-force variations at supercritical Reynolds numbers.…”

Section: Previous Studiesmentioning

confidence: 99%

High-order computational fluid dynamics simulations of a spinning golf ball

2019

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This paper presents the first high-order computational fluid dynamics (CFD) simulations of static and spinning golf balls at realistic flow conditions. The present results are shown to capture the complex fluid dynamics inside the dimples which lead to drag reduction versus a smooth sphere, and compare well to previous experimental and computational studies. The high-order Flux Reconstruction method has been paired with the Artificial Boundary overset method to enable simplified mesh generation and grid motion. The compressible Navier-Stokes equations are modeled using a scale-resolving Large Eddy Simulation (LES) approach with no sub-grid models. The codes implementing these methods have been implemented for NVIDIA Graphical Processing Units (GPUs), enabling large speedups over traditional computer hardware. The new method allows for the simulation of golf balls, and other objects at similar moderate Reynolds numbers, to be simulated in a matter of days on large computing clusters. The use of CFD for the design of objects such as golf balls and other sports balls is now within reach.

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“…Flow visualization is a purely qualitative technique used to analyse the flow features surrounding an object and has been implemented in a number of studies related to sports science such as tennis (Djamovski, Pateras, Chowdhury, Alam, & Steiner, 2012), soccer (Alam, Chowdhury, Moria, & Fuss, 2010;Carré, Goodwill, & Haake, 2005) and golf (Aoki, Muto, & Okanaga, 2010). There are various types of flow visualization techniques, namely smoke flow visualization, tuft flow visualization (Alam, Smith, Chowdhury, & Moria, 2012) and oil flow visualization.…”

Section: Introductionmentioning

confidence: 99%

“…The smoke flow visualization technique is chosen for this research, in which the sepak takraw ball is mounted in a fixed position in an open-loop, low-speed wind tunnel in order to visualize the flow features surrounding the ball. (Aoki et al, 2010) Another technique used to analyse the aerodynamic characteristics of sports balls is numerical simulation. Advancements in computing hardware and software have made it possible for scientists and researchers to perform complex simulations within a shorter time frame.…”

Section: Introductionmentioning

confidence: 99%

Aerodynamic study of modern sepak takraw ball: Flow visualization test approach

Mubin¹,

Ahmad²

2015

MoHE

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It has been shown in previous studies that the flight trajectories of sports balls are influenced by their aerodynamic characteristics. These aerodynamic characteristics are primarily dependent on the physical shape and surface texture of the balls. Even though sepak takraw is well established as a sport, little is known regarding the aerodynamic characteristics of the sepak takraw ball, which has a rather complex shape and surface texture. Hence, the main objective of this research is to investigate the aerodynamic characteristics (specifically the drag and lift coefficients) and flow features of a modern sepak takraw ball commercially available in the market by means of numerical simulations and wind tunnel experiments using the smoke flow visualization technique. The aerodynamic characteristics and flow features of the ball are determined for non-spinning conditions at a wind speed of 3 m/s. It is found that the drag coefficient and lift coefficient of the sepak takraw ball is 0.4868400 and -0.0130915, respectively. The images captured from the smoke flow visualization experiments reveal that the sepak takraw ball is in the subcritical flow regime at a wind speed of 3 m/s, which is the regime before the drag crisis. The laminar boundary layer separates from the upper and lower surfaces of the ball at points upstream of the equator of the ball, creating a large wake region downstream of the sepak takraw ball and resulting in high drag. This in turn, influences the trajectory of the sepak takraw ball in flight. The flow features observed from the smoke flow visualization experiments are representative of the flow during a sepak takraw game. Owing to the complexity of sepak takraw ball, it is recommended that the aerodynamic characteristics of the sepak takraw ball are investigated for spinning conditions in future studies.

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Aerodynamic characteristics and flow pattern of a golf ball with rotation

Cited by 44 publications

References 1 publication

Sharp Transition in the Lift Force of a Fluid Flowing Past Nonsymmetrical Obstacles: Evidence for a Lift Crisis in the Drag Crisis Regime

Sharp Transition in the Lift Force of a Fluid Flowing Past Nonsymmetrical Obstacles: Evidence for a Lift Crisis in the Drag Crisis Regime

High-order computational fluid dynamics simulations of a spinning golf ball

Aerodynamic study of modern sepak takraw ball: Flow visualization test approach

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