Simultaneous Computation of the External Flow around a Car Body and the Internal Flow Through its Engine Compartment

Ono, Kenji; Himeno, Ryutaro; Fujitani, Katsuro; Uematsu, Yutaka

doi:10.4271/920342

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Computational Fluid Dynamics1

Third-order Upwind-difference Scheme1

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1993

2004

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Cited by 13 publications

(2 citation statements)

References 9 publications

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“…Kuriyama 1988). Interaction between the interior and exterior flows has been treated by simultaneous computation of both flow fields (Ono et al 1992). The flow pattern inside the passenger compartment of cars and buses attracts increasing attention.…”

Section: Computational Fluid Dynamicsmentioning

confidence: 99%

Aerodynamics of Road Vehicles

Hucho¹,

Sovran²

1993

Annu. Rev. Fluid Mech.

331

149

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Section: Computational Fluid Dynamicsmentioning

confidence: 99%

Aerodynamics of Road Vehicles

Hucho¹,

Sovran²

1993

Annu. Rev. Fluid Mech.

331

149

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“…A first-order Euler implicit method is used for time derivatives, a third-order upwind-difference scheme (Kawamura et al, 1986) for convective terms, and second-order central-difference for the other spatial derivative terms. This scheme is applied to various three-dimensional high Reynolds number flows and shows very good results (Kawamura and Kuwahara, 1985;Himeno et al, 1990;Ono et al, 1992).…”

Section: Third-order Upwind-difference Schemementioning

confidence: 99%

Computational study of influences of a seam line of a ball for baseball on flows

Himeno

2001

J Vis

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Flows around a ball used in baseball games are calculated using third-order upwinddifference method with various seam positions determined by two rotation angles. Those are four-seam rotation with an angle: a and two-seam rotation with an angle: b. The computed results of the four-seam rotation are compared with experimental data measured in a wind tunnel and computed drag coefficients qualitatively agree well with experiments. However, lift coefficients do not agree well. The computed results and geometrical symmetry suggest that a supporting rod in the wind tunnel would have strong influence on the accuracy ofthe measurement.Flow changes in two-seam rotation are also simulated. It is found that the lowest drag force is observed at b=90 and that the value is less than half ofthe largest drag force at a=30 and 60 degrees. The largest lift force is observed at b=20 degree. In this case, a projection of the seam line on the top causes a large separation while smooth surface without the seam at the bottom dose not separate the flow. A pair of longitudinal vortices are found in the wake, which make wake slant and generate large lift force.

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Computational Study of Influences of a Seam Line of a Baseball on Flows

Himeno

Notes on Numerical Fluid Mechanics and Multidisciplinary Design (NNFM)

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Simultaneous Computation of the External Flow around a Car Body and the Internal Flow Through its Engine Compartment

Cited by 13 publications

References 9 publications

Aerodynamics of Road Vehicles

Aerodynamics of Road Vehicles

Computational study of influences of a seam line of a ball for baseball on flows

Computational Study of Influences of a Seam Line of a Baseball on Flows

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