The influence of vehicle body roll motion on aerodynamic characteristics under crosswind condition
Purpose The purpose of this study is investigate the transient aerodynamic characteristics of high-speed vehicle with body roll motion under crosswind condition to improve aerodynamic stability. Design/methodology/approach An overset mesh was used to simulate the rolling motion of the vehicle body....
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Published in | International journal of numerical methods for heat & fluid flow Vol. 33; no. 12; pp. 4138 - 4157 |
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Main Authors | , , , , , , |
Format | Journal Article |
Language | English |
Published |
Bradford
Emerald Publishing Limited
22.11.2023
Emerald Group Publishing Limited |
Subjects | |
Online Access | Get full text |
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Summary: | Purpose
The purpose of this study is investigate the transient aerodynamic characteristics of high-speed vehicle with body roll motion under crosswind condition to improve aerodynamic stability.
Design/methodology/approach
An overset mesh was used to simulate the rolling motion of the vehicle body. A wind tunnel experiment was conducted to validate the numerical method.
Findings
The results revealed that the vehicle’s aerodynamic characteristics changed periodically with the body’s periodic motion. In the absence of crosswind, the pressure distribution on the left and right sides of the vehicle body was symmetrical, and the speed streamline flowed to the rear of the vehicle in an orderly manner. The maximum aerodynamic lift observed in the transient simulation was −0.089, which is approximately 0.70 times that of the quasi-static simulation experiment. In addition, the maximum aerodynamic side force observed in the transient simulation was 0.654, which is approximately 1.25 times that of the quasi-static simulation experiment.
Originality/value
The aerodynamic load varies periodically with the vehicle body’s cyclic motion. However, the extreme values of the aerodynamic load do not occur when the vehicle body is at its highest or lowest position. This phenomenon is primarily attributed to the mutual interference of airflow viscosity and the hysteresis effect in the flow field, leading to the formation of a substantial vortex near the wheel. Consequently, the aerodynamic coefficient at each horizontal position becomes inconsistent during the periodic rolling of the vehicle body. |
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ISSN: | 0961-5539 0961-5539 1758-6585 |
DOI: | 10.1108/HFF-06-2023-0337 |