Numerical and experimental analysis of rotating wheel in contact with the ground

Kulak, Michał; Karczewski, Maciej; Leśniewicz, P; Olasek, Krzysztof; Hoogterp, Bas; Spolaore, Guillaume; Jóźwik, Krzysztof

doi:10.1108/hff-06-2017-0257

Cited by 6 publications

(6 citation statements)

References 13 publications

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“…According to the SAE-recommended blocking ratio of less than 5%, the blocking ratio in this article meets the requirements. In aerodynamic simulations, blocking ratios of less than 5% are generally acceptable (Ekman et al , 2020; Kulak et al , 2018). The inlet was configured as the velocity inlet, while the boundary outlet was set as the pressure outlet.…”

Section: Numerical Simulation Methodsmentioning

confidence: 99%

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: Numerical Simulation Methodsmentioning

confidence: 99%

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

Taiming,

Ma,

Zhang

et al. 2023

HFF

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“…The standard 32 m-span simply supported girder bridge is established in the TBDC model, which is applied most frequently in highspeed railway bridges in China. The atmospheric domain at the tunnel exit is simulated (Bardera et al, 2018;Kulak et al, 2018). Four types of boundary conditions are applied in the CFD model, including velocity-inlet, no-slip wall, symmetry and pressure-outlet.…”

Section: High-speed Railwaymentioning

confidence: 99%

“…The atmospheric domain at the tunnel exit is simulated using 200 × 120 × 50 m and 200 × 120 × 50 m cuboids in the TBDC and TF infrastructure, respectively. A rigid body velocity of 250 km/h is given to the HSRT by compiling a UDF into ANSYS/Fluent (Bardera et al , 2018; Kulak et al , 2018). Four types of boundary conditions are applied in the CFD model, including velocity-inlet, no-slip wall, symmetry and pressure-outlet.…”

Section: Numerical Reconstitution Scheme Of Natural Wind Fieldmentioning

confidence: 99%

“…Computational fluid dynamics (CFD) is an important method to understand the aerodynamic behaviour of HSRTs (Chen et al , 2019; Chen et al , 2021, 2022a, 2022b; Cuhadaroglu, 2009; Dang et al , 2015; Ma et al , 2018b, 2019, 2021; Kulak et al , 2018; Yang et al , 2018). For example, Mohebbi and Rezvani (2018, 2021) used CFD simulation to investigate the aerodynamic performance of trains when running in wind barriers and tried to optimum the porous barrier design considering the running safety of the train (Mohebbi and Safaee, 2022).…”

Section: Introductionmentioning

confidence: 99%

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Field test and numerical reconstitution of natural winds at the tunnel entrance section of high-speed railway

Yang

Liu

Deng

et al. 2022

HFF

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Purpose The purpose of this paper is to understand the natural wind field characteristics of the tunnel entrance section and analyzing the aerodynamic performance of high-speed railway trains (HSRTs) under natural winds. Design/methodology/approach Three typical tunnel entrance section sites, namely, tunnel–bridge in a dry canyon (TBDC), tunnel–bridge in a river canyon (TBRC) and tunnel–flat ground (TF), are selected to conduct a continuous wind field measurement. Based on the measured wind characteristics, the natural winds of the TBDC and TF sites are reconstituted and imported into the two corresponding full-scale computational fluid dynamics models. The aerodynamic loads of the HSRT running on TBDC and TF with reconstituted winds are simply analyzed. Findings The von Kármán spectrum can be used to describe the wind field at the tunnel entrance section. In the reconstituted natural wind condition, a time-varying feature of wind speed distribution and leeward side vortex around the HSRT caused by the wind speed fluctuation is found. The fluctuating amplitude of aerodynamic loads at the TBDC infrastructure is up to 97.9% larger than that at the TF infrastructure. Originality/value The natural wind characteristics at tunnel entrance sections on the high-speed railway are first measured and analyzed. A numerical reconstitution scheme considering the temporal and spatial variation of natural wind speed is proposed and verified based on field measurement results. The aerodynamic performance of an HSRT under reconstituted natural winds is first investigated.

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“…As the wind tunnel testing is essential for the aerodynamic development of e.g., a Formula 1 racecar, additive manufacturing allows one to produce everything from front wings, brake ducts and suspension covers to engine covers, internal ducts and hand deflectors [20]. Also, the whole car bodies [21] or the particular parts such as wheels [22] can be optimized, printed and tested at scale.…”

Section: D Printing In Aerodynamicsmentioning

confidence: 99%

Fast Track Integration of Computational Methods with Experiments in Small Wind Turbine Development

2019

Self Cite

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In general, standard aerodynamic design is divided into two paths—numerical analysis and empirical tests. It is crucial to efficiently combine both approaches in order to entirely fulfill the requirements of the design process as well as the final product. An effective use of computational analysis is a challenge, however it can significantly improve understanding, exploring and confining the search for optimal product solutions. The article focuses on a rapid prototyping and testing procedure proposed and employed at the Institute of Turbomachinery, Lodz University of Technology (IMP TUL). This so called Fast Track approach combines preparation of numerical models of a wind turbine rotor, manufacturing of its geometry by means of a 3D printing method and testing it in an in-house wind tunnel. The idea is to perform the entire procedure in 24 h. The proposed process allows one to determine the most auspicious sets of rotor blades within a short time. Owing to this, it significantly reduces the amount of individual subsequent examinations. Having fixed the initial procedure, it is possible to expand research on the singled-out geometries. The abovementioned observations and the presented overview of the literature on uses of 3D printing in aerodynamic testing prove rapid prototyping as an innovative and widely-applicable method, significantly changing our approach to experimental aerodynamics.

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Numerical and experimental analysis of rotating wheel in contact with the ground

Cited by 6 publications

References 13 publications

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

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

Field test and numerical reconstitution of natural winds at the tunnel entrance section of high-speed railway

Fast Track Integration of Computational Methods with Experiments in Small Wind Turbine Development

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