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Communications in Computational Physics 2010年第5期7卷 1049-1075页

作者： qiuhua liang School of Civil Engineering and Geosciences Newcastle UniversityNewcastle upon TyneNE17RUEnglandUK

Based on the recent development in shallow flow modelling, this paperpresents a finite volume Godunov-type model for solving a 4×4 hyperbolic matrixsystem of conservation laws that comprise the shallow water and depth-averaged solute transport equations. The adopted governing equations are derived to preserveexactly the solution of lake at rest so that no special numerical technique is necessaryin order to construct a well-balanced scheme. The HLLC approximate Riemann solveris used to evaluate the interface fluxes. Second-order accuracy is achieved using theMUSCL slope limited linear reconstruction together with a Runge-Kutta time integration method. The model is validated against several benchmark tests and the resultsare in excellent agreement with analytical solutions or other published numerical predictions.

关键词： Solute transport shallow water equations advection-diffusion equation wellbalanced scheme wetting and drying source terms Riemann solver

New prospects for computational hydraulics by leveraging high-performance heterogeneous computing techniques

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Journal of Hydrodynamics 2016年第6期28卷 977-985页

作者： qiuhua liang Luke SMITH Xilin XIA Hebei University of Engineering Handan 056038 China School of Civil Engineering and Geosciences Newcastle University Newcastle upon Tyne UK

In the last two decades, computational hydraulics has undergone a rapid development following the advancement of data acquisition and computing technologies. Using a finite-volume Godunov-type hydrodynamic model, this work demonstrates the promise of modern high-performance computing technology to achieve real-time flood modeling at a regional scale. The software is implemented for high-performance heterogeneous computing using the OpenCL programming framework, and developed to support simulations across multiple GPUs using a domain decomposition technique and across multiple systems through an efficient implementation of the Message Passing Interface （MPI） standard. The software is applied for a convective storm induced flood event in Newcastle upon Tyne, demonstrating high computational performance across a GPU cluster, and good agreement against crowd- sourced observations. Issues relating to data availability, complex urban topography and differences in drainage capacity affect results for a small number of areas.

关键词： computational hydraulics high-performance computing flood modeling shallow water equations shock-capttLring hydrodynamic model

Inflows/outflows driven particle dynamics in an idealised lake

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Journal of Hydrodynamics 2019年第5期31卷 873-886页

作者： Cheng-hua Dang Jingchun Wang qiuhua liang School of Water Conservancy and Hydropower Hebei University of EngineeringHandan 056021China Jeremy Benn Associates Limited ColeshillWarwickshireUK School of Architecture Building and Civil EngineeringLoughborough UniversityLoughboroughUK

This paper considers fluid mixing driven by inflows connected to a circular shallow lake using a numerical framework consisting of a shallow water hydrodynamic model and a passive particle-tracking *** the flow field driven by alternate inflows predicted by a shallow water model,particle trajectories are traced out using a particle tracking *** horizontal fluid mixing dynamics are then interpreted using dynamics system analysis approaches including finite-time Lyapunov exponent(FTLE)and Lagrangian coherent structure(LCS).From the simulation results,it is confirmed that periodic inflows are able to create a weak dynamic system in an idealised circular lake,with the particle dynamics controlled by a single dimensionless parameter associated with the inflow *** mixing and transport property of the lake changes from regular to chaotic as the value of the dimensionless parameter increases until global chaotic particle dynamics is *** further analysing the advection of particles injected continuously to the inflows(freshwater),the fate of“freshwater”particles in a“polluted”lake is tracked and *** results provide useful guidance for engineering applications,i.e.,transferring freshwater from rivers to improve the water quality in polluted water bodies such as *** presented approach will be able to facilitate the design of‘optimised’schemes for such engineering implementation.

关键词： Shallow environmental flow Lagrangian particle dynamics particle tracking inflows and outflows finite-time Lyapunov exponent Lagrangian coherent structure

A novel two-way method for dynamically coupling a hydrodynamic model with a discrete element model(DEM)

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Journal of Hydrodynamics 2018年第5期30卷 966-969页

作者： Yan Xiong qiuhua liang Samantha Mahaffey Mohamed Rouainia Gang Wang State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering Hohai UniversityNanjing 210098China School of Architecture Building and Civil EngineeringLoughborough UniversityLoughboroughUK School of Engineering Newcastle UniversityNewcastle upon TyneEnglandUK

The effect of floating objects has so far been little considered for hazard risk assessment and structure design, despite being an important factor causing structural damage in flood-prone and coastal areas. In this work, a novel two-way method is proposed to fully couple a shock-capturing hydrodynamic model with a discrete element model （DEM） for simulation of complex debris-enriched flow hydrodynamics. After being validated against an idealized analytical test, the new coupled model is used to reproduce flume experiments of floating debris driven by dam-break waves. The numerical results agree satisfactorily with the experimental measurements, demonstrating the model＇s capability and efficiency in simulating complex fluid-debris interactions induced by violent shallow flows.

关键词： Coupled model, discrete element model (DEM) extreme hydraulic conditions floating debris shallow water equations Godunov-type finite volume method

Hydrodynamic modelling of flow impact on structures under extreme flow conditions

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Journal of Hydrodynamics 2016年第2期28卷 267-274页

作者： qiuhua liang 陈恺翠 Jingming HOU 熊焱王岗羌娟 Key Laboratory of Coastal Disaster and Protection Ministry of Education Hohai University School of Civil Engineering and Geosciences Newcastle University Newcastle upon Tyne England

Apart from the direct threat to human lives, the flood waves as a result of the rapid catchment response to intense rainfall, breaches of flood defences, tsunamis or storm surges may induce huge impact forces on structures, causing structural damage or even failures. Most existing design codes do not properly account for these impact forces due to the limited understanding of the underlying physical processes and the lack of reliable empirical formulae or numerical approaches to quantifying them. This paper presents laboratory experiments to better understand the interaction between the extreme flow hydrodynamics and the hydraulic structures and uses the measured data to validate a numerical model. The model solves the two-dimensional shallow water equations using a finite volume Godunov-type scheme for the reliable simulation of complex flow hydrodynamics. New model components are developed for estimating the hydrostatic and hydrodynamic pressure to quantify the flow impact on structures. The model is applied to reproduce two selected experiment tests with different settings and satisfactory numerical results are obtained, which confirms its predictive capability. The model will therefore provide a potential tool for wider and more flexible field-scale applications.

关键词： wave-structure interaction extreme flow conditions flood hazards shallow flow model laboratory experiments

A COUPLED MORPHODYNAMIC MODEL FOR APPLICATIONS INVOLVING WETTING AND DRYING

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Journal of Hydrodynamics 2011年第3期23卷 273-281页

作者： liangqiuhua School of Civil Engineering and Geosciences Newcastle University Newcastle upon Tyne NE1 7RU England UK

This work presents a new finite volume Godunov-type model for predicting morphological changes under the rapidly varying flood conditions with wetting and drying. The model solves the coupled shallow water and Exner equations, with the interface fluxes evaluated by an Harten-Lax-van Leer-Contact （HLLC） approximate Riemann solver. Well-balanced solution is achieved using the surface gradient method and wetting and drying are handled by a non-negative reconstruction approach. The new model is validated against several theoretical benchmark tests and promising results are obtained.

关键词： morphodynamic model Exner equation shallow water equations Godunov-type method wetting and drying well- balanced scheme

高效高精度水动力模型在洪水演进中的应用研究

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水力发电学报 2018年第2期37卷 96-107页

作者：侯精明李桂伊李国栋 liang qiuhua 支再兴西安理工大学水利水电学院西安710048 英国纽卡斯尔大学土木工程与地球科学学院

针对现有的洪水演进及淹没过程二维数值模型中存在的计算精度不高、稳定性差、计算效率低下等问题,本文提出一套基于GPU加速技术的地表水动力数值模型(GAST)。选用英国莫帕斯小镇百年一遇洪灾为研究对象,模拟5 m和2 m分辨率地形下的城... 详细信息

针对现有的洪水演进及淹没过程二维数值模型中存在的计算精度不高、稳定性差、计算效率低下等问题,本文提出一套基于GPU加速技术的地表水动力数值模型(GAST)。选用英国莫帕斯小镇百年一遇洪灾为研究对象,模拟5 m和2 m分辨率地形下的城区淹没过程及范围,分析GAST模型的模拟精度、效率及稳定性。研究发现:GAST模型模拟淹没面积与实测结果百分误差仅为0.96%~4.36%,同时计算5 m、2 m分辨率地形用时分别为2.17 h、9.00 h,具有较高的模拟精度、效率及计算稳定性;对比相同输入条件下的MIKE21 FM模型,GAST模型计算精度提升1.07~19.55倍;GAST模型计算效率提升3.4~11.78倍,且随着计算网格数的增加效率优势更为明显,故其应用前景广阔。

关键词：水动力学模型数值模拟 GPU加速计算洪水演进计算效率

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巴恩斯对《梅杜萨之筏》的语象叙事研究

江苏科技大学学报（社会科学版） 2022年第4期22卷 33-37,44页

作者：梁秋花东南大学成贤学院基础部江苏南京210088

巴恩斯在2015年出版的著作《另眼看艺术》中,使用了语象叙事手法对席里柯、雷东、马奈等17位艺术家的艺术作品进行了文字再现,使人们得以重新审视语象叙事在文学作品中的功能及“语-图”之间的关系。其中,巴恩斯对席里柯的名画《梅杜萨... 详细信息

巴恩斯在2015年出版的著作《另眼看艺术》中,使用了语象叙事手法对席里柯、雷东、马奈等17位艺术家的艺术作品进行了文字再现,使人们得以重新审视语象叙事在文学作品中的功能及“语-图”之间的关系。其中,巴恩斯对席里柯的名画《梅杜萨之筏》的文字再现揭示了语象叙事在文学作品中肩负的言说功能和情感功能。一方面,语象叙事通过对艺术作品背景、创作过程等的文字书写,填补了艺术作品创作过程中的“图像空白”;另一方面,语象叙事能够呈现被凝视客体所欲向观众展现的预期力量,增强艺术作品的情感表达。“语-图”之间不再是传统的互竞高下的对立关系,而是互文性的和谐共生、相生相克、不可分离的关系。

关键词：朱利安·巴恩斯《梅杜萨之筏》语象叙事 “语-图”关系

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电动汽车副车架低压铸造数值模拟及工艺优化

特种铸造及有色合金 2022年第12期42卷 1573-1576页

作者：梁秋华韩伟杨安刘明臻广州城市理工学院机械工程学院广州510800 贵州蓝辉新材料有限公司

针对电动汽车铝合金副车架结构紧凑、壁厚不均和砂芯形状复杂等原因造成的低压铸造缺陷,合理设计模具结构、浇注系统和工艺参数,运用AnyCasting软件模拟分析副车架低压铸造的温度、压力和砂芯体积等因素对凝固组织品质的影响,预测铸件... 详细信息

针对电动汽车铝合金副车架结构紧凑、壁厚不均和砂芯形状复杂等原因造成的低压铸造缺陷,合理设计模具结构、浇注系统和工艺参数,运用AnyCasting软件模拟分析副车架低压铸造的温度、压力和砂芯体积等因素对凝固组织品质的影响,预测铸件卷气、热节和孤立液相发生情况。调整设计冒口、冷却水道和局部镶件等优化措施,运用冷却水管开闭时序调整铝合金冷却凝固顺序,提高了副车架内部组织的致密度及低压铸造生产品质。

关键词：副车架低压铸造冷却水道时序控制局部镶件

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水环境综合治理下泾河新城河道景观设计研究

艺术科技 2023年第12期36卷 220-223页

作者：梁秋华南京林业大学艺术设计学院江苏南京210037

城市河流承担着防御洪涝、交通运输、提供水源、休闲娱乐、清洁城市、生物栖息等综合功能,文章针对当前人口扩张导致废气、废水的无节制排放,水质恶化、生态环境退化,以及防洪设施固化等城市河流面临的普遍问题,提出水环境综合治理下泾... 详细信息

城市河流承担着防御洪涝、交通运输、提供水源、休闲娱乐、清洁城市、生物栖息等综合功能,文章针对当前人口扩张导致废气、废水的无节制排放,水质恶化、生态环境退化,以及防洪设施固化等城市河流面临的普遍问题,提出水环境综合治理下泾河新城下游段河道景观环境的治理方法,总结水环境治理和景观设计一体化的进程,为其他城市河道景观设计提供参考。文章通过文献阅读法和实地调研法,探讨泾河新城下游段河道面临的洪涝灾害、水质状况、河道生境、河流地貌以及相关部门的监管机制等问题,对泾河新城下游段河道景观修复设计提出相应的方案。基于水环境治理,建立一套水环境治理体系,分别为水安全、水环境、水资源、水生态、水管理这5个类别。在水安全方面,修建橡胶坝、蓄水池以及湿地公园;在水环境方面,建立城市污水处置点和垃圾处置点,对农业污染进行严格管控,对河道内部采取措施;在水资源方面,建立蓄水池和生态涵养林;在水生态方面,建设生态涵养林、生态岛以及滩涂湿地;在水管理方面,监测水文信息和生物群落,人为进行干预,完善环境评价机制,宣传河道环境保护,对泾河新城下游段河道进行综合治理。

关键词：水环境泾河新城河道综合治理景观修复