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Research on transient aerodynamic characteristics of windshield wipers of vehicles

Research on transient aerodynamic characteristics of windshield wipers of vehicles PurposeThe 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/approachA 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.FindingsThe 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/valueThe LES method in combination with dynamic mesh technique to study the transient aerodynamic characteristics of windshield wipers is relatively new. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png International Journal of Numerical Methods for Heat & Fluid Flow Emerald Publishing

Research on transient aerodynamic characteristics of windshield wipers of vehicles

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Publisher
Emerald Publishing
Copyright
Copyright © Emerald Group Publishing Limited
ISSN
0961-5539
DOI
10.1108/HFF-09-2018-0531
Publisher site
See Article on Publisher Site

Abstract

PurposeThe 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/approachA 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.FindingsThe 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/valueThe LES method in combination with dynamic mesh technique to study the transient aerodynamic characteristics of windshield wipers is relatively new.

Journal

International Journal of Numerical Methods for Heat & Fluid Flow – Emerald Publishing

Published: Aug 5, 2019

References

  • Large eddy simulation of an ahmed reference model
  • Flow over a realistic car model: wall modeled large eddy simulations assessment and unsteady effects
  • Acoustic sources localization: application to wiper aerodynamic noises
  • Experimental study on ahmed's body drag coefficient for different yaw angles
  • Measuring the effect of the rainfall on the windshield in terms of visual performance
  • Simulation of aerodynamic uplift consequences on pressure repartition – application on an innovative wiper blade design
  • Numerical investigation of turbulent flow over a windscreen wiper blade
  • Numerical and experimental investigation of wiper system performance at high speeds
  • Numerical study of the aerodynamics of a full scale train under turbulent wind conditions, including surface roughness effects
  • The use of CFD to predict the aerodynamic characteristics of simple automotive shapes
  • A Quasi-unsteady description of windscreen wiper induced flow structures
  • On the use of reference models in automotive aerodynamics