Large Eddy Simulation of the Flow Around a Simplified Car Model

Nusser, Katrin; Müller, Stefan; Scheit, Christoph; Oswald, Marco; Becker, Stefan

doi:10.1007/978-3-319-63212-4_30

Cited by 2 publications

(2 citation statements)

References 5 publications

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“…To account for turbulence in the flow, a large eddy simulation (LES) with a Smagorinsky subgrid-scale model is used. It was shown in previous work [18,19] that this turbulence modeling approach is best suited to capture the small turbulent structures which occur around the simplified car model. In the acoustic regions, the propagation of sound is calculated based on the perturbed convective wave equation (PCWE) [20][21][22]:…”

Section: Methodsmentioning

confidence: 99%

Numerical investigation of the fluid structure acoustics interaction on a simplified car model

Nusser

Becker

2021

Acta Acust.

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Part of vehicle interior noise is caused by the complex turbulent flow field behind the a-pillar and side mirror. It excites the structure of the side window, which radiates noise into the interior. Both aerodynamic pressure excitation and acoustic sound sources in the flow play an important role. In this work, the influence of both excitation mechanisms is investigated numerically in a hybrid simulation on a simplified car geometry. The generic model allows for an exact definition of boundary conditions and good reproducibility of simulation results. An incompressible Large-Eddy-Simulation (LES) of the flow is conducted, from which acoustic source terms within the flow field and transient fluid forces acting on the surface of the side window are extracted. This data is used in a coupled vibroacoustic and aeroacoustic simulation of the structure and passenger cabin of the vehicle. A finite element (FE) approach is used for the simulations and detailed modeling of the structure and the influence of interior absorption properties is emphasized. The computed excitation on the side window and the interior noise levels are successfully validated by using experimental data. The importance and contribution of both aerodynamic and acoustic pressure excitation to the interior sound level are determined.

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Section: Methodsmentioning

confidence: 99%

Numerical investigation of the fluid structure acoustics interaction on a simplified car model

Nusser

Becker

2021

Acta Acust.

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“…In the realm of computational aerodynamics and aeroacoustics for automotive vehicles, RANS-LES methods have emerged as prominent approaches over the past two decades. Regardless of the chosen approach for investigating both vehicle aerodynamic performance and aeroacoustics (direct or hybrid), RANS-LES methods have gained recognition for their ability to deliver solutions with superior accuracy compared to the RANS approach [14,27,28] while remaining computationally more e cient than the full LES subjected to realistic ow conditions [9,29,30,31]. To date, various RANS-LES variants, viz., DES, DDES, IDDES, and SBES approaches coupled with near-wall modelling using SST, SA, and k-ε approaches, have been extensively applied to generic and non-generic mirror geometries [52,53,54,55], SAE-T4 and DrivAer vehicle con gurations [10,11,22,32].…”

Section: Introductionmentioning

confidence: 99%

The Role of Forebody Topology on Aerodynamics and Aeroacoustics Characteristics of Squareback Vehicles using Computational Aeroacoustics (CAA)

Viswanathan,

Chode

2023

Preprint

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This study investigates the influence of forebody configuration on aerodynamic noise generation and radiation in standard squareback vehicles, employing a hybrid computational aeroacoustics approach. Initially, a widely used standard squareback body is employed to establish grid-independent solutions and validate the applied methodology against previously published experimental data. Six distinct configurations are examined, consisting of three bodies with A-pillars and three without A-pillars. Throughout these configurations, the reference area, length, and height remain consistent, while systematic alterations to the forebody are implemented. The findings reveal that changes in the forebody design exert a substantial influence on both the overall aerodynamics and aeroacoustics performance of the vehicle. Notably, bodies without A-pillars exhibit a significant reduction in downforce compared to their A-pillar counterparts. For all configurations, the flow characteristics around the side-view mirror and the side window exhibit an asymmetrical horseshoe vortex with high-intensity pressure fluctuations, primarily within the confines of this vortex and the mirror wake. Side windows on bodies with A-pillars experience more pronounced pressure fluctuations, rendering these configurations distinctly impactful in terms of radiated noise. However, despite forebody-induced variations in pressure fluctuations impacting the side window and side-view mirror, the fundamental structure of the radiated noise remains relatively consistent. The noise pattern transitions from a cardioid-like shape to a monopole-like pattern as the probing distance from the vehicle increases.

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Large Eddy Simulation of the Flow Around a Simplified Car Model

Cited by 2 publications

References 5 publications

Numerical investigation of the fluid structure acoustics interaction on a simplified car model

Numerical investigation of the fluid structure acoustics interaction on a simplified car model

The Role of Forebody Topology on Aerodynamics and Aeroacoustics Characteristics of Squareback Vehicles using Computational Aeroacoustics (CAA)

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