Numerical Study on the Effect of Boat Tail Shape on Aerodynamic Drag of SUV

2021 ◽  
Vol 22 (1) ◽  
pp. 165-172
Author(s):  
Hyun A. Choi ◽  
Sung Oh Park ◽  
Ho Gyun Moon ◽  
Moon Sang Kim ◽  
Jung Sik Cho
Keyword(s):  
Aerodynamic Drag ◽  
Numerical Study ◽  
Tail Shape

Nonlinear dynamic behaviour of guy cables in turbulent winds

2001 ◽  
Vol 28 (1) ◽  
pp. 98-110 ◽  
Author(s):  
Bruce F Sparling ◽  
Alan G Davenport
Keyword(s):  
Finite Element ◽  
Dynamic Behaviour ◽  
Aerodynamic Drag ◽  
Numerical Study ◽  
Horizontal Displacement ◽  
Wind Loading ◽  
Second Phase ◽  
Nonlinear Coupling ◽  
Wide Range ◽  
Cable Vibrations

Large amplitude cable vibrations are difficult to predict using linear theory due to the presence of sag in the suspended profile. A numerical study was therefore undertaken to investigate the dynamic behaviour of inclined cables excited by imposed displacements. To model the nonlinear nature of cable response, a time domain finite element approach was adopted using nonlinear catenary cable elements. Two types of horizontal displacement patterns were enforced at the upper end of the guy. In the first phase of the study, harmonic displacement histories with a wide range of forcing frequencies were considered. In the second phase, random enforced displacements were used to simulate the motion of a guyed mast in gusty winds. The influence of aerodynamic drag and damping forces was investigated by performing analyses under still air, steady wind, and turbulent wind conditions. It was found that nonlinear coupling of related harmonic response components was significant at certain critical frequencies, particular when the excitation was harmonic and acted in the plane of the guy. Positive aerodynamic damping was shown to effectively suppress resonant and nonlinear coupling response.Key words: cables, structural dynamics, wind loading, finite element method, nonlinear analysis, guyed towers.

Numerical study on reducing aerodynamic drag and noise of circular cylinders with non-uniform porous coatings

2020 ◽  
Vol 107 ◽  
pp. 106308
Author(s):  
Pikai Zhang ◽  
Yu Liu ◽  
Zhiyong Li ◽  
Hanru Liu ◽  
Yannian Yang
Keyword(s):  
Aerodynamic Drag ◽  
Numerical Study ◽  
Circular Cylinders ◽  
Porous Coatings

scholarly journals Numerical Study of the Generic Sports Utility Vehicle Design with a Drag Reduction Add-On Device

2014 ◽  
Vol 2014 ◽  
pp. 1-17 ◽  
Author(s):  
Shubham Singh ◽  
M. Zunaid ◽  
Naushad Ahmad Ansari ◽  
Shikha Bahirani ◽  
Sumit Dhall ◽  
...  
Keyword(s):  
Drag Reduction ◽  
Drag Coefficient ◽  
Aerodynamic Drag ◽  
Numerical Study ◽  
Fuel Efficiency ◽  
Ansys Fluent ◽  
Mean Pressure ◽  
Aerodynamic Drag Coefficient ◽  
Total Base ◽  
Aerodynamic Parameters

CFD simulations using ANSYS FLUENT 6.3.26 have been performed on a generic SUV design and the settings are validated using the experimental results investigated by Khalighi. Moreover, an add-on inspired by the concept presented by Englar at GTRI for drag reduction has been designed and added to the generic SUV design. CFD results of add-on model and the basic SUV model have been compared for a number of aerodynamic parameters. Also drag coefficient, drag force, mean surface pressure, mean velocities, and Cp values at different locations in the wake have been compared for both models. The main objective of the study is to present a new add-on device which may be used on SUVs for increasing the fuel efficiency of the vehicle. Mean pressure results show an increase in the total base pressure on the SUV after using the device. An overall reduction of 8% in the aerodynamic drag coefficient on the add-on SUV has been investigated analytically in this study.

Drag-based aerodynamic braking system for the Hyperloop: a numerical study

2020 ◽  
pp. 1-10
Author(s):  
Mohammed Raihan Uddin ◽  
Tahsin Sejat Saniat ◽  
Sayedus Salehin ◽  
Md. Hamidur Rahman
Keyword(s):  
High Speed ◽  
Aerodynamic Drag ◽  
Numerical Study ◽  
Detailed Comparison ◽  
Sustainable Transportation ◽  
Transport Infrastructure ◽  
Braking System ◽  
Passenger Safety ◽  
Aerodynamic Brake ◽  
High Mach

The Hyperloop promises to revolutionize the transport infrastructure of the 21st century by reducing travel time and allowing people to reach transonic speed on land. It carries with it the hope of a sustainable transportation system during an era of global energy crisis. Overall passenger safety in a high-speed pod necessitates a reliable braking system. This paper introduces the possibility of utilizing aerodynamic drag in the Hyperloop, anticipated to operate at high Mach and low Reynolds flow regime, to attenuate the speed of the pod. Numerical analysis was conducted to investigate the effect of incorporating an aerodynamic brake at different pod velocities (100, 135, and 150 m/s) and deployment angles (30°, 45°, 60°, and 90°). A detailed comparison between the proposed aerodynamic braking system (AeBS) and existing braking systems for the Hyperloop has been presented in this paper. The results demonstrate an increase in drag value of the pod by 3.4 times using a single 0.15 m2 brake plate. When the brake plate was fully deployed at a pod velocity in excess of 112 m/s, the aerodynamic drag-based braking systems was shown to be more effective than the contemporary eddy current braking system.

Numerical study on aerodynamic drag by variation of rear side slope of sedan cars

2019 ◽  
Author(s):  
Md Jisan Mahmud ◽  
Masnun Mehedi ◽  
Mohammad Ali
Keyword(s):  
Aerodynamic Drag ◽  
Numerical Study ◽  
Rear Side ◽  
Side Slope

scholarly journals Numerical Study on Aerodynamic Drag Reduction of Racing Cars

2014 ◽  
Vol 90 ◽  
pp. 308-313 ◽  
Author(s):  
S.M. Rakibul Hassan ◽  
Toukir Islam ◽  
Mohammad Ali ◽  
Md. Quamrul Islam
Keyword(s):  
Drag Reduction ◽  
Aerodynamic Drag ◽  
Numerical Study ◽  
Aerodynamic Drag Reduction

scholarly journals Numerical study on the influence of the nose and tail shape on the aerodynamic characteristics of a Hyperloop pod

2022 ◽  
pp. 107362
Author(s):  
Thi Thanh Giang Le ◽  
Jihoon Kim ◽  
Kyeong Sik Jang ◽  
Kwan-Sup Lee ◽  
Jaiyoung Ryu
Keyword(s):  
Numerical Study ◽  
Aerodynamic Characteristics ◽  
Tail Shape

Aerodynamic Drag Reduction by Synthetic Jet: A 2D Numerical Study Around a Simplified Car

2006 ◽  
Author(s):  
Cédric Leclerc ◽  
Eugénie Levallois ◽  
Azzedine Kourta ◽  
Patrick Gilliéron
Keyword(s):  
Drag Reduction ◽  
Aerodynamic Drag ◽  
Numerical Study ◽  
Synthetic Jet ◽  
Aerodynamic Drag Reduction
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