涡识别应用–Liutex值计算代码下载

Rotex.c (4248 downloads)

In the paper “The visualization of turbulent coherent structure in open channel flow” by Bai et al. (2019) -( https://doi.org/10.1007/s42241-019-0026-0 , share this article https://rdcu.be/b457g)

a code the author used is available above.

代码完成功能: 用于计算流场中的Liutex值

用法:同OpenFOAM中vorticity,Q等后处理工具,执行Rotex -case XXX

涡是流体力学中的重要现象,但迄今为止,人们对涡的认识还很模糊,还未能给出一个有物理意义和被广泛接受的定义方法。多年来人们尝试了多种方法,早期曾采用涡量方法,但后来发现涡量和涡结构的关联性不高。后来,又发展了多种以速度梯度张量特征值为代表的涡识别方法,如常用的Q,和等。但这些方法在实际使用过程中,研究者需要不停地调整阈值以获得一个主观确定的等值面效果。从2014年开始,美国德州大学阿灵顿分校的刘超群教授团队提出了涡识别方法和Liutex向量方法。涡识别方法定义为速度梯度张量反对称部分比上对称和反对称部分之和,当比值大于0.5可以认为旋转占优,其应用建议在0.52~0.6之间取值,可使得识别的涡结构基本保持不变。Liutex向量的核心思想是将涡量进一步分解为旋转部分(R)和非旋转部分(S),其中新分解出来的R部分代表流体运动的刚体旋转部分,其认为该空间矢量可用于表征旋涡结构。Liutex 给涡的研究提供了新的视角。

CONTENTS OF CHINESE JOURNAL OF HYDRODYNAMICS Vol.35 No.2 2020

http://yuanjian.cnki.com.cn/cjfd/home/Detail/SDLJ202002

 CONTENTS

Turbulence closure model based on neural network and direct numerical simulation data
WANG Shu-zhi, ZHAN Lin-hao, CAO Bo-chao, et al. (141)
Calculation of Ship Rolling Capsizing Probability based on 4-dimension path integral solution
HE Cheng-liang, FAN Ju, ZHU Ren-chuan, et al. (155)
Equilibrium Depth Prediction of Local Scour around Piers in Sandy Riverbed
WANG Fei, YAO Lei-hua, ZHANG Bin, et al. (164)
Traveling wave convection with two intermittent defects
NING Li-zhong, ZHANG Ke, NING Bi-bo, et al. (171)
Effect of fluid viscosity on motion and added resistance of a ship advancing in head waves
YUAN Shuai, ZOU Zao-jian (179)
Solving shallow water wave equation based on moving grid entropy stable scheme
WANG Ling, ZHENG Su-pei (188)
Blasingame production decline analysis for a multi-fractured horizontal well in tight reservoirs
YIN Hong-jun, YUAN Hong-fei, FU Chun-quan, et al. (194)
Three-dimensional simulation and analysis of thermal discharge transport in a coast with lagoon and estuary
GU Jie, HAN Xue-jian, KUANG Cui-ping, et al. (201)
Experimental study on wave elimination of vegetation generalized model under regular wave action
GONG Shang-peng, CHEN Jie, JIANG Chang-bo, et al. (213)
Numerical Research on Impact Force Characteristics of a Droplet Impacting on Spherical Surfaces
WANG Shun, WANG Wen-lei, GUO Jia-hong (222)
Spatiotemporal distribution characteristics of velocity circulation around a vortex-induced vibration cylinder with single degree of freedom
Jing Xue-ling-zi, Ji Chun-ning, Yuan De-kui (229)
Influence of anchor cable inclination Angle on motion response of submerged floating tunnel with different section
LIU Yu, JIN Rui-jia, GENG Bao-lei, et al. (237)
Investigation on the influence of inlet gas volume fraction on the performance of deep-sea multiphase pump
LI Chen-hao, LUO Xing-qi, FENG Jian-jun, et al. (248)
The numerical study on the propulsive mechanism of balistiform
ZHANG Rui-qian, HU Wen-rong (258)
Experimental investigation on flow-induced vibration characteristics of the rudder-wing system of an underwater vehicle
ZHENG Xu, TANG Min, CHEN Ke, et al. (266)

CONTENTS OF JOURNAL OF HYDRODYNAMICS Vol.32 No.2 2020

https://link.springer.com/journal/42241/32/2

CONTENTS

FEATURE ARTICLE

Liutex theoretical system and six core elements of vortex identification
Yi-qian Wang, Yi-sheng Gao, Hongyi Xu, Xiang-rui Dong, Jian-ming Liu, Wen-qian Xu, Meng-long Chen, Chaoqun Liu(197)

REVIEW ARTICLE

Numerical techniques for coupling hydrodynamic problems in ship and ocean engineering
Xiao-song Zhang, Jian-hua Wang, De-cheng Wan(212)

SPECIAL COLUMN ON THE INTERNATIONAL SYMPOSIUM ON HIGH-FIDELITY COMPUTATIONAL METHODS AND APPLICATIONS 2019 (GUEST EDITORS HUI XU, WEI ZHANG)

Deep reinforcement learning in fluid mechanics: A promising method for both active flow control and shape optimization
Jean Rabault, Feng Ren, Wei Zhang, Hui Tang, Hui Xu(234)
Active flow control using machine learning: A brief review
Feng Ren, Hai-bao Hu, Hui Tang(247)
Active flow control with rotating cylinders by an artificial neural network trained by deep reinforcement learning
Hui Xu, Wei Zhang, Jian Deng, Jean Rabault(254)

SPECIAL COLUMN ON THE 3RD SYMPOSIUM ON COMPUTATIONAL MARINE HYDRODYNAMICS (GUEST EDITOR DE-CHENG WAN)

An unstructured mesh method for numerical simulation of violent sloshing flows
Changhong Hu, Mohamed M. Kamra(259)
A sharp-interface immersed smoothed point interpolation method with improved mass conservation for fluid- tructure interaction problems
Bo-qian Yan, Shuangqiang Wang, Gui-yong Zhang, Chen Jiang, Qi-hang Xiao, Zhe Sun(267)
Vortex identification methods in marine hydrodynamics
Wei-wen Zhao, Jian-hua Wang, De-cheng Wan(286)

ARTICLES

ARTICLES Law-of-the-wall analytical formulations for Type-A turbulent boundary layers
Duo Wang, Heng Li, Bo-chao Cao, Hongyi Xu(296)
Mean flow and turbulence structure of open channel flow with suspended vegetation
Qian Li, Yu-hong Zeng, Yu Bai(314)
Detached-eddy simulation of turbulent coherent structures around groynes in a trapezoidal open channel
Jing-xin Zhang, Jian Wang, Xiang Fan, Dongfang Liang(326)
Experimental study of anti-cavitation mechanism of valve lintel natural aeration of high head lock
Xin Wang, Ya-an Hu, Jian-min Zhang(337)
Large eddy simulation of the transient cavitating vortical flow in a jet pump with special emphasis on the unstable limited operation stage
Xin-ping Long, Dan Zuo, Huai-yu Cheng, Bin Ji(345)
Evolution characteristics and quantization of wave period variation for breaking waves
Shu-xiu Liang, Zhao-chen Sun, Yan-ling Chang, Ying Shi(361)
Erosion characteristics and mechanism of the self-resonating cavitating jet impacting aluminum specimens under the confining pressure conditions
Hua-lin Liao, Sheng-li Zhao, Yan-feng Cao, Lei Zhang, Can Yi, Ji-lei Niu, Li-hong Zhu(375)
Experimental study of wave propagation characteristics on a simplified coral reef
Jia-yi Xu, Shu-xue Liu, Jin-xuan Li, Wei Jia(385)
Large eddy simulation of cavitating flows with dynamic adaptive mesh refinement using OpenFOAM
Lin-min Li, Dai-qing Hu, Yu-cheng Liu, Bi-taoWang,Chen Shi, Jun-jie Shi, Chang Xu(398)
LETTER Fin performance of 3-D aerator devices with backward lateral deflectors
Jian-rong Xu, Jian-hua Wu, Yu Peng, Fei Ma(410)
Erratum
(414)

第三十一届全国水动力学研讨会 征文通知

NCHD2020-第三十一届全国水动力学研讨会征文通知.pdf (5325 downloads)

为了促进水动力学跨学科的学术交流,为广大科研人员提供发表最新研究成果和交换研究信息的机 会,第三十一届全国水动力学研讨会拟于 2020 年 10 月 30 日至 11 月 3 日在福建厦门召开。会议将邀请各 方面专家作大会报告,还将进行学术交流和有关考察活动。欢迎广大水动力学工作者踊跃参加会议,并广 泛提出在经济建设中迫切需要解决的水动力学问题,使工程设计单位与教学科研单位紧密协作,共同攻关, 为建设小康社会服务。

1. 征文范围 (1) 水电和河流动力学;(2) 船舶与海洋工程水动力学;(3) 理论与计算流体力学;(4) 近代测试技术; (5) 工业流体力学;(6) 海洋与大气动力学;(7) 传热、传质、环境;(8) 水动力学基础研究;(9) 其它与水 动力学有关的边缘问题。 本届会议将要开辟几个特殊专题研讨:(1) 空化和空泡流动;(2) 人工智能在水动力学中的应用;(3)涡与湍流研究;(4)涡激振动。请投稿时指明专题,以便安排。

2. 征文要求 (1) 请投寄论文摘要一份,专家评审组将根据投寄的摘要内容决定是否录用。论文摘要内容应包括:1. 文章题目;2. 作者姓名、单位、邮编和电话;3. 论文内容简要说明(包括文中处理方法及重要结果) 。 (2) 投寄电子邮箱: nchd@jhydrodynamics.com。 (3) 投寄期限:摘要投寄截止日期为 2020 年 4 月 15 日;摘要录用通知发放日期为 2020 年 5 月 5 日; 全 文投寄截止日期为 2020 年 6 月 30 日。

3. 注意事项 (1) 投寄的论文应是尚未在公开出版(有刊号)的期刊上发表过。 (2) 录用的论文将编入《第三十一届全国水动力学研讨会文集》(由海洋出版社正式出版),并在第三十 一届全国水动力学研讨会上安排交流。 (3) 会议将推荐优秀论文在《水动力学研究与进展》A 辑专栏上发表,少数原创性强的特别优秀的论文 推荐到 B 辑 Journal of Hydrodynamics 上发表。 (4) 会议将评选学生优秀论文奖 6-8 名(评选条件:学生为论文的第一作者并在会议上交流),在闭幕 式宣布并颁发奖状和奖金。 (5) 地址:上海市高雄路 185 号《水动力学研究与进展》编辑部,邮编 200011。 电话:021-63150072 网址:www.jhydrodynamics.com

主办单位:
《水动力学研究与进展》编委会
中国力学学会
中国造船工程学会
集美大学
承办单位:
集美大学轮机学院
中国力学学会水动力学专业组
上海造船工程学会船舶流体力学专业委员会
上海中船编印社有限公司
《水动力学研究与进展》编辑部
2020 年 1 月

CONTENTS OF JOURNAL OF HYDRODYNAMICS Vol.32 No.1 2020

CONTENTS

SPECIAL COLUMN ON THE 3RD INTERNATIONAL SYMPOSIUM OF CAVITATION AND MULTPHASE FLOW (GUEST EDITORS HONG-XUN CHEN, WEI ZHANG)

Effect of compressibility on bubbly cavitating flows
Harish Ganesh, Anubhav Bhatt, Juliana Wu, Steven Ceccio(1)
Hydrodynamic mechanisms of aggressive collapse events in leading edge cavitation
Mohammad Hossein Arabnejad, Ali Amini, Mohamed Farhat, Rickard E. Bensow(6)
Numerical investigation on free surface effect on the supercavitating flow over a low aspect ratio wedge-shaped hydrofoil
Chang Xu, Boo Cheong Khoo(20)

ARTICLES

Numerical investigation of flow with floating vegetation island
Yi-dan Ai, Meng-yang Liu, Wen-xin Huai(31)
Numerical study of high-lift hydrofoil near free surface at moderate Froude number
Tao Xing, Konstantin I. Matveev, Miles P. Wheeler(44)
A dynamic solution for predicting resonant frequency of piston mode fluid oscillation in moonpools/narrow gaps
Lei Tan, Lin Lu, Guo-qiang Tang, Liang Cheng(54)
Wave action by arrays of vertical cylinders with arbitrary smooth cross-section
Jia-bin Liu, An-xin Guo, Qing-he Fang, Hui Li, Hui Hu, Peng-fei Liu(70)
Experimental investigation of vortex generator influences on propeller cavitation and hull pressure fluctuations
Hong-bo Huang, Yun Long, Bin Ji(82)
Drag reduction and flow structures of wing tip sails in ground effect
Jian-xun Zhou, Cheng-hong Sun, Daichin(93)
Slip in Couette flow with pressure gradient: Theoretical and experimental investigation of hydrodynamic characteristics considering slip effect
Xin Zhao, Chao Wei, Shi-hua Yuan(107)
Development of two-dimensional numerical wave tank based on lattice Boltzmann method
Guang-wei Liu, Qing-he Zhang, Jin-feng Zhang(116)
Study of parametric roll in oblique waves using a three-dimensional hybrid panel method
Min Gu, Shu-xia Bu, Jiang Lu(126)
Reconstruction of 3-D surface waves generated by moving submerged sphere based on stereo imaging principle
Xin-long Wang, Gang Wei, Hui Du, Shao-dong Wang(139)
Adaptive mesh refinement immersed boundary method for simulations of laminar flows past a moving thin elastic structure
Mohammed Suleman Aldlemy, Mohammad Rasidi Rasani, A. K. Ariffin, T. M. Y. S. Tuan Ya(148)
A design of T-foil and trim tab for fast catamaran based on NSGA-II
Qi-dan Zhu, Yu Ma(161)

LETTERS

Spatial and spectral investigation of turbulent kinetic energy in cavitating flow generated by Clark-Y hydrofoil
Xiao-rui Bai, Huai-yu Cheng, Bin Ji, Xin-ping Long(175)
Flow regime and energy dissipation of SFS-type flip buckets
Ran Tian, Jian-hua Wu, Fei Ma(179)
Numerical simulation of condensation shock in partial cavitating flow on a hydrofoil
Wei Zhang , Bing Zhu , Yong Wang, Hui Xu(183)
Journal of Hydrodynamics, Vol. 31 Annual Classified Catalog (2019).
(188)