Algorithm to Generate Liutex Core Lines Based on Forward Liutex Magnitude Gradient Lines DOI Creative Commons
Yifei Yu, Chaoqun Liu

IntechOpen eBooks, Год журнала: 2023, Номер unknown

Опубликована: Дек. 4, 2023

Vortex definition and identification are extremely important for the study of fluid dynamics research. Liutex is a newly proposed concept that correctly represents vortex. vector whose direction local rotation axis magnitude twice angular speed. To identify unique structure vortex, method known as Core Line has been developed, which displays rotational core However, original manual method, not practical real application, an automatic algorithm required usage. Xu et al. by selecting best line from group candidate lines, progress. In this chapter, another perspective to solve problem, new introduced based on forward gradient lines. Since lines have feature they advance maximums, route will still result in line, avoids process find line. This achieved some success Lambda vortex early boundary layer transition.

Язык: Английский

Characteristics of cavitation evolution through a butterfly valve under transient regulation DOI
Guang Zhang,

Wei Wei Wang,

Hao Tian Zhang

и другие.

Physics of Fluids, Год журнала: 2023, Номер 35(2)

Опубликована: Янв. 19, 2023

As the key control equipment for transmission of fluid medium, butterfly valves are widely used in systems media energy, chemical industry, metallurgy, aerospace engineering, and other fields, playing an important role stability reliability system operation. When flow cross section suddenly changes, pressure rapidly decreases downstream, leading to cavitation valves. Cavitation causes serious erosion damage valve core pipeline surface, resulting leakage noise problems valves, which seriously affects regulation performance lifetime In this study, numerical analyses conducted investigate evolution at transient a plate through model. Moreover, effects opening degree rotating speed on volume distribution, rate change, growth–collapse cavitation, correlation between vortex closing processes investigated. Due influence hysteresis, characteristic parameters exhibit different behaviors

Язык: Английский

Процитировано

11

Effect of Paddle Mode on Flow Characteristics of a Continuous Stirred Tank Reactor (CSTR) Using CFD Simulations DOI Creative Commons
Peng Li, Xuan Wu, Feng Cheng

и другие.

Lecture notes in mechanical engineering, Год журнала: 2025, Номер unknown, С. 685 - 692

Опубликована: Янв. 1, 2025

Язык: Английский

Процитировано

0

Particle Image Velocimetry Measurements and Numerical Simulation of the Flow and Vortex in a Hydraulic Mountain‐Bottom Submerged Entry Nozzle DOI Open Access
Chengjian Hua, Dong Wang,

Jianfei Guan

и другие.

steel research international, Год журнала: 2025, Номер unknown

Опубликована: Фев. 3, 2025

The submerged entry nozzle (SEN) is a critical component in the continuous casting process, facilitating transfer of molten steel from tundish to mold. internal flow dynamics within SEN are crucial as they influence several key aspects casting, such mold characteristics, inclusion transport, susceptibility clogging, and ultimate quality produced steel. In this study, hydraulic model established, particle image velocimetry (PIV) employed measure velocity magnitudes inside nozzle. Computational fluid simulations conducted using Reynolds‐averaged Navier–Stokes large eddy simulation (LES) with varying mesh sizes. time‐averaged magnitude calculated by shear stress transport medium LES finer resolution exhibits good agreement PIV measurements. Vortices predominantly observed near bottom close proximity wall. Notably, pair counter‐rotating vortices identified at bottom. Furthermore, transient fluctuations effectively captured employing resolutions.

Язык: Английский

Процитировано

0

Interaction between vortex shedding and flap oscillation in separation control of a stalled aerofoil DOI
Yannian Yang, Pengyu Li, Yongsheng Zhou

и другие.

Aerospace Science and Technology, Год журнала: 2025, Номер unknown, С. 110300 - 110300

Опубликована: Май 1, 2025

Язык: Английский

Процитировано

0

Wave-in-deck loads induced by regular wave impact: The role of compressible air entrainment DOI
Ting Zhou, Zhe Ma,

Gangjun Zhai

и другие.

Journal of Fluids and Structures, Год журнала: 2023, Номер 122, С. 103974 - 103974

Опубликована: Сен. 8, 2023

Язык: Английский

Процитировано

7

Vortex identification based on the Liutex method and its effect on fish passage upstream DOI

Chunying Shen,

Rui-guo Yang,

Xiaotao Shi

и другие.

Journal of Hydrodynamics, Год журнала: 2024, Номер 36(1), С. 130 - 141

Опубликована: Фев. 1, 2024

Язык: Английский

Процитировано

2

Direct numerical simulations of first-mode oblique breakdown in a supersonic boundary layer under wall transpiration DOI
Lun Zhang, Zhongzheng Jiang, Yunlong Qiu

и другие.

Aerospace Science and Technology, Год журнала: 2024, Номер 150, С. 109165 - 109165

Опубликована: Апрель 28, 2024

Язык: Английский

Процитировано

2

The flame macrostructure and thermoacoustic instability in a centrally staged burner operating in different pilot stage equivalence ratios DOI Creative Commons

Jingyuan Xiang,

Jiacheng Li,

Weishu Mo

и другие.

Physics of Fluids, Год журнала: 2024, Номер 36(7)

Опубликована: Июль 1, 2024

The main focus of this paper is to discover the link between flame macrostructure and thermoacoustic instability in a centrally staged swirl burner. In practical combustors, flow rate pilot stage much smaller than that stage. However, modification could alter while maintaining similar total rate. Therefore, was examined at different macrostructures by varying equivalence ratio under identical inlet conditions. High-frequency planar laser measurements chemiluminescence measurement were conducted enhance spatial temporal accuracy, providing more comprehensive understanding instability. Two macrostructures, S-type I-type flames, identified based on preheating zone distribution. They exhibit distinct instabilities, with flames demonstrating intense flames. results indicate variation influences coupling heat release field. Specifically, greater sensitivity field fluctuations, resulting complex fluctuation flame. This discrepancy leads variations intensity, as well changes phase acoustic pressure, which turn impact Rayleigh index. Meanwhile, significant differences exist distribution pattern range fluctuations

Язык: Английский

Процитировано

2

Correlation analysis between underwater noise and Liutex for DTMB4119 propeller DOI
Lianjie Yu,

Jian-wei Wu,

Decheng Wan

и другие.

Journal of Hydrodynamics, Год журнала: 2022, Номер 34(4), С. 585 - 595

Опубликована: Авг. 1, 2022

Язык: Английский

Процитировано

10

Experimental Study of Flow Hydrodynamics Around Circular Cylinder Arrangements Using Particle Image Velocimetry DOI
Chitrangini Sahu, T. I. Eldho, B. S. Mazumder

и другие.

Journal of Fluids Engineering, Год журнала: 2022, Номер 145(1)

Опубликована: Сен. 13, 2022

Abstract This study investigates the turbulent flow properties experimentally in vicinity of two side-by-side circular cylinders, along with influence third cylinder same dimension placed upstream and successively downstream forming an equilateral triangle. Three-dimensional stereoscopic particle image velocimetry (PIV) was employed to collect instantaneous velocity data around arrangements. The highlights prime parameters turbulence such as mean velocities, Reynolds stresses, kinetic energy (TKE), quadrant analysis, Q-criteria for vortices, which are responsible development various problems scour-hole cylindrical pier arrangements, disturbance industrial marine structures. spectral analysis performed examine distributions, vortex-shedding frequencies corresponding Strouhal numbers. Dominant vorticity locations were identified from contours Q-criteria. magnitude characteristics reduced by 15–20% (turbulence intensity 20% TKE 15%) when group. Streamlines also studied visualize patterns a better understanding physics presence cylinder. maximum vortices obtained spectrum showed that generated less is upstream.

Язык: Английский

Процитировано

10