Asymmetric vortex forces and wakes on slender bodies

Hunt, B. L.

doi:10.2514/6.1982-1336

Cited by 139 publications

(54 citation statements)

References 20 publications

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“…This characteristic of the sectional side force distributions is in good agreement with the knowledge obtained in a previous experimental study. 3,20) Therefore, the side force is comparable value between with the large bump and the medium bump instead of stronger asymmetricity in the vortex structure with the large bump. As the results, the relationship between the side force and the bump height is nonlinear.…”

Section: Effect Of Bump Heightmentioning

confidence: 98%

“…The vortex structure remains to be symmetric. (3) When the angle of attack exceeds the threshold value, the vortex filaments separate from the body surface and the vortex structure becomes asymmetric. The asymmetric vortices exert strong side force on the body.…”

Section: Characteristics Of Flow Field Over Slender Body At High Anglmentioning

confidence: 99%

“…Therefore, to control the side force and yawing moment can be one of the important research themes. Many studies 2,3) have been conducted to clarify the generation mechanism of the asymmetric separation vortices and understanding the structure and transport characteristics of the vortices. These previous researches aim at suppression and control of the asymmetric vortices, i.e.…”

mentioning

confidence: 99%

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Numerical Investigation of Asymmetric Separation Vortices over Slender Body by RANS/LES Hybrid Simulation

Inaba

Nishida

Nonomura

et al. 2012

AEROSPACE TECHNOLOGY JAPAN

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We analyze the asymmetric vortices in the flow over a slender body at high angle of attack by numerical simulations aiming a proportional control of the side forces generated by vortices with a device such as dielectric barrier discharge (DBD) plasma actuator. With regard to the computational method, Reynolds averaged Navier Stokes/large-eddy simulation hybrid method is adopted with high-order compact spatial difference scheme. The grid convergence analysis is firstly conducted and the results show that the computational grid adopted in this study is fine enough for qualitative discussion. The total number of the grid point is 411 million points. Then, the effects of bump height on flow fields and aerodynamic characteristics are discussed. Note that bump is added near the body apex to simulate the symmetry-breaking imperfection. As a higher bump is adopted, stronger asymmetry is observed in the flow fields. On the other hand, side-force has nonlinearity with the bump height.

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Section: Effect Of Bump Heightmentioning

confidence: 98%

Section: Characteristics Of Flow Field Over Slender Body At High Anglmentioning

confidence: 99%

mentioning

confidence: 99%

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Numerical Investigation of Asymmetric Separation Vortices over Slender Body by RANS/LES Hybrid Simulation

Inaba

Nishida

Nonomura

et al. 2012

AEROSPACE TECHNOLOGY JAPAN

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“…1 (4), and α UV = 70-75 degrees. Many studies have been conducted trying to clarify the generation mechanism of the asymmetric separation vortices and understand the structure and transport characteristics of these vortices (these topics are reviewed in references 2,3) ). These studies aim at the suppression and control of the asymmetric vortices (i.e., the side forces) using flow-control devices because conventional attitude-control devices such as thrusters and rudders are inefficient and/or ineffective.…”

Section: Introductionmentioning

confidence: 99%

“…High-power thrusters are required because the large side force amplitudes and rudders in the wake flow do not work very well. An active-flow control is one of the effective solutions, and several active-flow control devices such as micro jets and small moving flaps have already been proposed and studied [2][3][4][5] ; however, no active-flow control device has been put into practice because of its wide-ranging mechanics and/or additional high-pressure working fluids.…”

Section: Introductionmentioning

confidence: 99%

Preliminary Experimental Study on Aerodynamic Characteristics Control of Slender Body Using DBD Plasma Actuator

Nishida

Mizuki

Miyazaki

et al. 2012

AEROSPACE TECHNOLOGY JAPAN

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Asymmetric separation vortices over a slender body at a high angle of attack exert a strong side force on the body and lead to the loss of attitude stability. We investigated the active control of the separation flow over a slender body and addressed the proportional control of the side force and the pitching moment. A flow control experiment was conducted in a wind tunnel using a cone-cylinder test body and a Dielectric Barrier Discharge (DBD) plasma actuator as a flow control device. The free-stream velocity was 9 m/s and the Reynolds number was approximately 42000. The side force coefficient was proportionally controlled within approximately ±1.0 using the actuator at the aft body, and the static stability angle of attack was controlled from 25 to 40 degrees and 65 to 85 degrees by controlling the pitching moment when the center of gravity was at the 55% position from the body apex. We estimated that a higher actuator output power is required for the effective control of the aerodynamics in a real flight. In addition, we confirmed that the actuator burst operation mode could reduce the required output power.

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CFD Study on a Pitching Missile with Respect to Reduce the Phantom Yaw Effect

Schnepf¹,

Schülein²

2016

Notes on Numerical Fluid Mechanics and Multidisciplinary Design

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Asymmetric vortex forces and wakes on slender bodies

Cited by 139 publications

References 20 publications

Numerical Investigation of Asymmetric Separation Vortices over Slender Body by RANS/LES Hybrid Simulation

Numerical Investigation of Asymmetric Separation Vortices over Slender Body by RANS/LES Hybrid Simulation

Preliminary Experimental Study on Aerodynamic Characteristics Control of Slender Body Using DBD Plasma Actuator

CFD Study on a Pitching Missile with Respect to Reduce the Phantom Yaw Effect

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