Editorial

Marklund, Anders

doi:10.1386/jsca.3.1.3_2

Cited by 1 publication

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“…Pressure drag and friction drag are the most important factors in aerodynamic design [3]. Aerodynamic drags can be minimized through geometry and flow modification of the vehicle since the geometry of the car is considered as one of the main factors affecting the drags [4]. The Ahmed body has been used as a benchmark test case to validate numerical simulation models [5].…”

Section: Introductionmentioning

confidence: 99%

An URANS Simulation of the Kelvin-Helmholtz Aerodynamic Effect over the Ahmed Body

Sadykov

Khalimov

Kylyshbek

et al. 2021

International Journal of Automotive Science and Technology

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The reduction of energy consumption of cars is always a significant issue in automotive design. Turbulent flow around a car body is very difficult to simulate accurately due to the complexity of the flow conditions around the body, such as complex flow separation and laminar to turbulent flow transition. In particular, flow over the Ahmed body with a rear angle of 25o is considered a challenging problem for the RANS approach with two-equation turbulence models. In this study, we aim to analyze the Kelvin-Helmholtz instability associated with this flow with a URANS approach. Methodology for utilizing the URANS method is fully discussed. The predicted velocity profiles and drag coefficient are com-pared with experimental results. Three turbulence models, such as the k-ε, k-ω and SST models, are assessed and validated with experimental data. The aim of the study is to evaluate the performance of these models for the study of the Kel-vin-Helmholtz instability over the Ahmed body and for car bodies generally us-ing experimental data for their validations. It is found that the URANS approach with the turbulence models with proper numerical treatment can perform as well as or even better than the LES. And the SST model shows the best performance compared with other turbulence models.

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Section: Introductionmentioning

confidence: 99%