Numerical investigation of the passive control of cavity flow oscillations by a dimpled non-smooth surface

Wang, Yiping; Li, Shuai; Yang, Xue

doi:10.1016/j.apacoust.2016.04.005

Cited by 19 publications

(15 citation statements)

References 29 publications

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“…It has been shown to better predict the separating flows and is widely used in engineering applications. For example, using two-equation models, previous scholars conducted research on street canyon flow [26], large tank fire [27,28], internal combustion engine [29,30] and heat exchange [31,32]. The corresponding governing equations are as follows:…”

Section: Governing Equationsmentioning

confidence: 99%

Numerical Investigation on Handling Stability of a Heavy Tractor Semi-Trailer under Crosswind

Zhang

Zhou

et al. 2020

Applied Sciences

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Due to the large lateral area of the trailer and variable road conditions, the handling stability of a heavy tractor semi-trailer under crosswind is very important for road safety. In this present work, numerical simulation is performed to study the crosswind effects on handling stability of a tractor semi-trailer. The aerodynamic characteristics of the tractor semi-trailer under different crosswind were computed by computational fluid dynamics (CFD). Then, mathematical models to reveal the relationship between the aerodynamic forces and crosswind were constructed to serve as inputs of the multi-body dynamics to analyze the handling stability under crosswind. The performance of crosswind stability is evaluated by the response of lateral acceleration, yaw rate and the lateral displacement. The lateral acceleration and yaw rate were decreased by a maximum of 14.6% and 16.5% compared to the truck without the deflector, which showed that the crosswind aerodynamics and stability were obviously improved.

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Section: Governing Equationsmentioning

confidence: 99%

Numerical Investigation on Handling Stability of a Heavy Tractor Semi-Trailer under Crosswind

Zhang

Zhou

et al. 2020

Applied Sciences

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“…C d tested at a wind speed of 30 m/s by the experiment is 0.323, which indicates that the relative error of numerical, and the experimental value is less than 5 per cent. The error may be caused by the insufficiently elaborate facture of the test model, the imperfection of test methods, the property of the boundary layer and the wall interference (Wang et al, 2014;Wang et al, 2016). At the same time, because of the limitations of computational resources and methods, such as the accuracy of mesh and turbulence models, a gap exists between (Moonen et al, 2006).…”

Section: Model Validationmentioning

confidence: 99%

Research on transient aerodynamic characteristics of windshield wipers of vehicles

Chen

Gu²,

Jiang

2019

HFF

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Purpose The main purpose of this paper is to gain a better understanding of the transient aerodynamic characteristics of moving windshield wipers. In addition, this paper also strives to illustrate and clarify how the wiper motion impacts the airflow structure; the aerodynamic interaction of two wipers is also discussed. Design/methodology/approach A standard vehicle model proposed by the Motor Industry Research Association and a pair of simplified bone wipers are introduced, and a dynamic mesh technique and user-defined functions are used to achieve the wiper motion. Finite volume methods and large eddy simulation (LES) are used to simulate the transient airflow field. The simulation results are validated through the wind tunnel test. Findings The results obtained from the study are presented graphically, and pressure, velocity distributions, airflow structures, aerodynamic drag and lift force are shown. Significant influences of wiper motion on airflow structures are achieved. The maximum value of aerodynamic lift and drag force exists when wipers are rotating and there is a certain change rule. The aerodynamic lift and drag force when wipers are rotating downward is greater than when wipers are rotating upward, and the force when rotating upward is greater than that when steady. The aerodynamic lift and drag forces of the driver-side wiper is greater than those of the passenger-side wiper. Originality/value The LES method in combination with dynamic mesh technique to study the transient aerodynamic characteristics of windshield wipers is relatively new.

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“…To this end, various flow control techniques have been used in order to control the flow; they fall into two broad categories: passive control and active control. Passive techniques are generally simple to implement and inexpensive, since they do not require an external input of energy; they mainly use geometric or physical characteristics to act on the flow [1,2]. Active techniques require an external input of energy which must be as low as possible to optimize the energy supplied/energy gain ratio.…”

Section: Introductionmentioning

confidence: 99%

Effects of the Control Parameters on the Stability of a Laminar Boundary Layer on a Porous Flat Plate

Lihonou

Monwanou

Miwadinou

et al. 2021

International Journal of Applied Mechanics and Engineering

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This work is devoted to the analysis of the linear temporal stability of a laminar dynamic boundary layer on a horizontal porous plane plate. The basic flow is assumed to be laminar and two-dimensional. The basic flow velocity profiles are obtained by numerically solving the Blasius equation using the Runge-Kutta method. The perturbations of these basic solutions are expressed in the form of three-dimensional Tollmien-Schlichting waves. The formulation of the stability problem leads to the Orr-Sommerfeld equation modified by the permeability parameter (Darcy number) and the small Reynolds number. This equation is given in a general form which can be applied to the Chebyshev domain and the boundary layer domain and solved numerically using the Chebyshev spectral collocation method. The marginal stability diagrams, the critical Reynolds numbers and the eigenvalue spectra are obtained for different values of the parameters which have modified the stability equation. Numerical solutions indicate the importance of the effect of these parameters on the flow stability characteristics.

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Numerical investigation of the passive control of cavity flow oscillations by a dimpled non-smooth surface

Cited by 19 publications

References 29 publications

Numerical Investigation on Handling Stability of a Heavy Tractor Semi-Trailer under Crosswind

Numerical Investigation on Handling Stability of a Heavy Tractor Semi-Trailer under Crosswind

Research on transient aerodynamic characteristics of windshield wipers of vehicles

Effects of the Control Parameters on the Stability of a Laminar Boundary Layer on a Porous Flat Plate

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