CFD Aerodynamic Analysis of Ahmed Body

Khan, Rehan Salahuddin; Umale, Sudhakar

doi:10.14445/22315381/ijett-v18p262

Cited by 11 publications

(4 citation statements)

References 8 publications

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“…We applied Ahmed body modelling geometry to simplify a fastback type car with simulation 3D Computational fluid dynamics (CFD) modelling applications using ANSYS Student R18.2. In this study, a comparison of cars using the Gurney Flap was obtained and also compared the model from this study with other existing studies [27]- [29].…”

Section: Figure 2 Airfoil With Gurney Flap [6]mentioning

confidence: 99%

Aerodynamic Characteristics of Ahmed Body with Inverted Airfoil Eppler 423 and Gurney Flap on Fastback Car

Arifin

Suyitno

Tjahjana

et al. 2022

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The installation of aerodynamic devices, such as rear wings with the application of a Gurney flap, is very important to improve the performance of vehicles and can generate downforce and reduce slip when a car turns and brakes. The goal of this study was to determine the aerodynamic characteristics of the addition of a rear wing using an Eppler 423 airfoil, which was applied with a Gurney flap featuring variations in the angle of attack and the height of the Gurney flap. The rear wing was mounted on the Ahmed body with a rear slant angle of 15°, which is similar to the configuration on a fastback type car. This research was conducted by 3D modeling through computational fluid dynamics (CFD) simulation using ANSYS Student R18.2 by using ahmed body design. There are three variations in the angle of attack for the rear wing (0°, 7.5°, and 15°), as well as five variations in Gurney flap height of 0%, 0.5%, 1%, 1.5%, and 2% for the chord-line length. In this study, the best variation was found at an angle of attack of 15⁰ with a height of 2% C. From this configuration improved CL/CD ratio by 25.36% when compared to the results without a Gurney flap.

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Section: Figure 2 Airfoil With Gurney Flap [6]mentioning

confidence: 99%

Aerodynamic Characteristics of Ahmed Body with Inverted Airfoil Eppler 423 and Gurney Flap on Fastback Car

Arifin

Suyitno

Tjahjana

et al. 2022

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“…They also play roles in training wind tunnel personnel, assessing wall interference effects, and identifying problems and faults in the operation and verification of new measurement techniques or devices [2][3][4]. These test articles are not limited to aircraft and have been developed for various applications including submarines [5], automotives [6], or civil purposes [7].…”

Section: Introductionmentioning

confidence: 99%

A Generic Model for Benchmark Aerodynamic Analysis of Fifth-Generation High-Performance Aircraft

Giannelis,

Bykerk,

Vio

2023

Aerospace

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This paper introduces a generic model for the study of aerodynamic behaviour relevant to fifth-generation high-performance aircraft. The model design is presented, outlining simplifications made to retain the key features of modern high-performance vehicles while ensuring a manufacturable geometry. Subsonic wind tunnel tests were performed with force and moment balance measurements used to develop a database of experimental validation data for the platform at a freestream velocity of 20 m/s. Numerical simulations are also presented and validated by the experiments and further employed to ensure the vortex behaviour is consistent with contemporary high-performance platforms. A sensitivity study of the computational predictions from the turbulence modelling approach is also presented. This geometry is the first in a suite of representative aircraft geometries (the Sydney Standard Aerodynamic Models), in which all geometries, computational models, and experimental data are made openly available to the research community (accessible via this link: https://zenodo.org/communities/ssam_gen5/) to serve as validation test cases and promote best practices in aerodynamic modelling.

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“…Khan and Umale [4] was proposed aerodynamic analysis of Ahmed body using Ansys Fluent. They implemented the study in two separate cases changing front of the body radius (R80 and R120) and ground clearance (20 mm and 40 mm).…”

Section: Introductionmentioning

confidence: 99%

Shape modification of Ahmed body to reduce drag coefficient and determination of turbulence model

Şumnu¹

2021

Ömer Halisdemir Üniversitesi Mühendislik Bilimleri Dergisi

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In this study, the aerodynamic analysis of Ahmed body which is generic automobile model is performed to determine convenient turbulence model and reduce drag coefficient by modifying shape of model. For this purpose, Computational Fluid Dynamics (CFD) analysis is carried out using different turbulence models that are Spalart-Allmaras, (Shear Stress Transport) SST k-, Standard k-, Realizable k-, (Re-Normalisation Group) RNG k- turbulence models. The results are compared with experimental data that is available in literature. The results show that RNG k- turbulence model gives superior performance when compared with other models. In order to reduce drag coefficient, the upper region of sides of model is rounded by applying fixed blend radius with 25 mm. The smooth surface can provide high performance in point of aerodynamics. CFD solution is then repeated for the modified model and the result show that drag coefficient value reduces about 6%. In addition, the second modification is performed by applying fixed blend radius with rounded both upper sides and rear underside of body and chamfer with 50 mm is also applied to rear sides of body. However, drag coefficient reduction level is approximately same with first modified model. The pressure coefficient contours and velocity streamlines are presented to show results for baseline and modified bodies.

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CFD Aerodynamic Analysis of Ahmed Body

Abstract: Abstract-

Cited by 11 publications

References 8 publications

Aerodynamic Characteristics of Ahmed Body with Inverted Airfoil Eppler 423 and Gurney Flap on Fastback Car

Aerodynamic Characteristics of Ahmed Body with Inverted Airfoil Eppler 423 and Gurney Flap on Fastback Car

A Generic Model for Benchmark Aerodynamic Analysis of Fifth-Generation High-Performance Aircraft

Shape modification of Ahmed body to reduce drag coefficient and determination of turbulence model

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