A5089758366- Aerodynamics and Fluid Dynamics Research
- Wind and Air Flow Studies
- Vehicle Noise and Vibration Control
- Fluid Dynamics and Vibration Analysis
- Hydraulic and Pneumatic Systems
- Fluid Dynamics and Turbulent Flows
- Vehicle Dynamics and Control Systems
- Aerodynamics and Acoustics in Jet Flows
- Noise Effects and Management
- Vibration Control and Rheological Fluids
- Simulation and Modeling Applications
Hunan University
2018-2022
Large-eddy simulation (LES) and Detached-eddy (DES) were applied to a simple cavity model calculate the wind buffeting noise respectively. The results verified by tunnel experiments. show that LES is more suitable for calculation. method was employed automobile side-window noise. correctness of validated road test. In this paper, acoustically calculated sound pressure level (SPL) spectral curve used as initial signal acoustic post-processing. Four psychoacoustic objective parameters namely:...
The severe additional aerodynamic loads that are generated on a small car when overtaking coach have an adverse effect the handling stability and its safety. In this article, two-way coupling of unsteady aerodynamics multi-body dynamics is performed in order to study mutual interactions maneuver with coach. obtained by using SST (Menter) K-Omega Detached Eddy Simulation overset mesh technology. couple dynamics, taking into account effects transverse spacing cross winds. To validate necessity...
Since the results of wake flow simulation with commonly used turbulence models are unsatisfactory, by introducing a nonlinear Reynolds stress term and combining DES (Detached Eddy Simulation) model, this paper further validates nonlinear-LRN (Low Number)/DES model which can predict separation reattachment phenomenon more accurately. This was verified wall-mounted hump case applied to time-averaged transient field structure analysis realistic automotive several widely models. These were...
Purpose The purpose of this paper is to develop a numerical model used for calculating the nonlinearities large-scale hydro-pneumatic suspension (HPS) and investigating effects variations in flow path operational parameter on damping response. Design/methodology/approach To parameterization suspension, author developed two-phase HPS based computational fluid dynamics volume method. Considerable effort was made verify by field measurements carried out an off-highway mining dump truck....
摘要: 目前对于汽车风振噪声的优化研究主要以声压级(Sound pressure level,SPL)作为单一评价指标,既不能全面反映噪声的物理属性,也无法考虑人耳对噪声的主观认知过程。为准确评价风振噪声,引入声品质,运用大涡模拟(Large eddy simulation,LES)对风振噪声进行数值仿真,根据实车道路试验判断仿真的准确性;对仿真结果进行声品质客观评价与主观评价,综合声品质客观评价参数与声品质主观评价试验结果建立BP神经网络预测模型;利用遗传算法(Genetic algorithm,GA),进一步对BP神经网络的结构参数进行优化,建立GA-BP声品质预测模型。研究结果表明,GA-BP声品质预测模型在训练速度和预测精度上都优于BP神经网络预测模型。预测模型基于声品质主客观评价结果,其预测值可以代替传统的声压级评价指标,为风振噪声提供更为准确合理的评价。
In view of the unsatisfactory calculation accuracy common turbulence models, two improved called low-Reynolds number (ILRN) k− ε and Detached EddySimulation (DES)-ILRN are proposed. Basing on (LRN ε) model in this paper, revised concepts include introduction time scale, eddy viscosity coefficient limitation concept separation perception model. Otherwise, DES is by introducing ILRN The models validated through wind tunnel test. Then, buffeting noise from rear windows received DES-ILRN...
In this article, a nonlinear LRN/DES turbulence model is proposed by introducing Reynolds stress and scale resolution simulation methods to address the contradiction between computational cost accuracy of existing models in wind buffeting noise simulations. After verifying feasibility backward-facing step flow, carried out based on simple cavity model. By comparing with several commonly used experimental results, it found that simulates frequency sound pressure level most accurately, capture...