Identification and dynamics of coherent structures in a Coanda swirling jet flow

Yang, Zhu; Castaneda, Victor; Öğüş, Güven; Holemans, Thomas; Vanierschot, Maarten; Valera‐Medina, Agustin

doi:10.1016/j.expthermflusci.2022.110817

Cited by 9 publications

(2 citation statements)

References 31 publications

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“…Figure 9 illustrates the instantaneous flow structure around the vehicle in both noncrosswind and crosswind conditions. Several researchers have proposed methods for identifying coherent flow structures (Iollo and Taddei, 2022; Yang et al , 2023). In this research, we use the Q-criterion proposed by Hunt et al (1988) to identify coherent structures around the vehicle.…”

Section: Resultsmentioning

confidence: 99%

“…The continuity conservation equation can be expressed as: The equation of k and the equation of ω are given as follows (Fu et al , 2007): The equation of eddy viscosity coefficient is (Yang et al , 2023): In equations (1) and (2), P k and P ω are the turbulent generation terms. Relevant studies have found that they are defined in model equations and the values of the phase relationships (Spalart, 2009).…”

Section: Numerical Simulation Methodsmentioning

confidence: 99%

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The influence of vehicle body roll motion on aerodynamic characteristics under crosswind condition

Taiming,

Ma,

Zhang

et al. 2023

HFF

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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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Section: Resultsmentioning

confidence: 99%