悬移质运动扩散方程的应用

从悬移质运动剖面二维扩散方程出发 ,通过适当假定 ,获得了饱和含沙量垂线分布公式、悬移质运动一维质量守恒方程和剖面二维实用型方程 ;重新定义了“α系数” ,给出了理论计算公式 ,使数值模拟的理论基础和可操作性得到了强化     

基于雷诺应力方程模型的全附体潜艇尾部伴流场三维粘性数值计算

采用Reynolds应力方程模型求解Reynolds平均Navier—Stokes方程，对SUBOFF全附体模型的尾部伴流场进行了三维粘性数值模拟，将计算的潜艇尾部伴流场同有关文献的试验结果进行了比较，计算结果同试验结果具有很好的一致性。结果表明，Reynolds应力方程模型在潜艇的流场计算中特别是在对潜艇的尾部伴流场的计算方面具有很好的应用价值和发展前景。     

鸭绿江河口潮流泥沙数值模拟

在分析鸭绿江河口实测水文泥沙资料的基础上,采用MIKE21 FM模块建立了基于多重嵌套网格模式的河口潮流场和泥沙场数学模型,模型范围为上游丹东市的江桥至河口江海分界线以外6~7 m等深线附近,并对2个潮位站、15个流速流向和含沙量测站进行了验证,对现状条件下的河口水域流场和泥沙场进行了数值模拟与分析。研究结果表明:落潮流速一般大于涨潮,沿程变化上浪头港以下2 km附近及斗流浦航槽内平均流速较大,至河口段水面逐渐放宽,致使落潮水流流速有减小趋势;含沙量沿程呈递增趋势,最大含沙量出现在各分汊水道的上口,即斗流浦水域。     

基于CFD的潜艇阻力及流场数值计算

运用雷诺平均N-S方程,使用CFD前处理软件ICEM CFD划分流场网格,采用RNG k-ε湍流模型,实现了对裸潜体、带指挥台围壳艇体、带十字尾翼艇体、全附体潜艇4种模型的阻力及粘性流场的数值模拟。通过数值模拟,得到了潜艇表面压力分布情况和附体附近流场的一些特性,为进一步优化潜艇的艇型和分析潜艇的流噪声打下了基础。而阻力的对比在一定程度上验证了数值模拟的可靠性。     

椒江河口水沙特征分析和悬沙分布推算

基于椒江河口2009~2014年洪、枯季共5次全潮水文泥沙测验数据,分析了河口区的水沙特征,建立了河口区洪、枯季大潮期半潮平均涨落潮水沙关系,利用二维潮流泥沙数学模型结果对水沙关系推算的含沙量分布进行了验证。结果表明:椒江河口的水流从外海至口门逐渐增大,高浓度悬沙从口外向口门积聚,白沙至琅矶山一线以西海域的悬沙浓度较高;河口区含沙量分布与流场及水下地形呈良好的相关关系;结合潮流场数值模拟结果,拟合的水沙关系可较好地推算出河口区的悬沙浓度分布。     

单兵火箭发射筒管内非定常流场数值模拟

由于火箭发动机的运动,使得发射筒内的火箭燃气流场具有运动边界.通过求解二维轴对称N-S方程,对某单兵火箭筒发射筒管内的非稳态流场进行了数值模拟,湍流模型采用带旋流修正的κ-ε模型(Realizab leκ-ε模型),得到了发射筒内的流场分布.     

基于FLUENT CFD的椭圆形水下滑翔器伯努利方程验证

利用软件FLUENT CFD对某椭圆形滑翔器不同来流速度进行数值模拟,并且运用流体力学中的伯努利方程对椭圆形浮标周围物理场进行验证。结果表明,椭圆形水下滑翔器周围流场中,在同一条流线上各点的单位重量流体所具有的总机械能近似相等,即一条流线上不同点的动能、压力能、位置势能之和是一个定值,并且误差不超过3%,从而验证了伯努利方程在全流场流线的任何一点上均成立。通过数值模拟验证伯努利方程,可知椭圆形水下滑翔器满足一般的水动力性能要求。     

基于数值模拟方法的导流片和蜂窝器对空泡水洞工作段流场的影响研究

通过求解RANS(Reynolds-Averaged Navier-Stokes)方程,对某中型空泡水洞工作段的流场特性进行数值模拟,并将所得结果与试验测试结果相对比,验证该数值模拟方法的可行性。采用该数值模拟方法分别对不含蜂窝器、不含蜂窝器和导流片的空泡水洞模型进行数值模拟,并对这2种模型的流场特性及工作段流场的不均匀度和湍流度的数值计算结果进行对比,分析导流片和蜂窝器对空泡水洞工作段流场特性的影响。计算结果表明,蜂窝器和导流片对保证空泡水洞工作段水流的速度和流动均匀性具有重要作用。     

基于CFD方法的立轴泵肘形进水流道优化研究

本文基于CFD建立数学模型对立轴泵肘形进水流道进行数值模拟,采用全隐式多重网格把连续性方程和动量方程进行耦合求解流场,引入代数多重网格技术,提高求解稳定性和计算速度,通过方案必选确定了进口水流流线均匀、水力损失小的肘形流道参数,保证了出口流场稳定,避免出口气蚀,影响水泵综合效率。     

天津港港内水沙分布特征值分析

利用潮流和泥沙淤积数学模型计算了天津港的流场分布、含沙量分布以及悬沙落淤强度分布 ,其结果与实测资料基本一致 .     

Errata

正In the paper"Influence of Fouling Assemblage on the Corrosion Behaviour of Mild Steel in the Coastal Waters of The Gulf of Mannar,India"in Vol.12,No.4,Page:509,References were lost,and the two authors’biographies were identical.The correct text is shown below.We apologize to the authors and our readers for any inconvenience caused by the errors.     

Journal of Marine Science and Application 2014 Sum. Contents

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第34届海洋、离岸及极地工程国际会议(英文)

正St.John's,Newfoundland,Canada,May 31-June 5,2015 OMAE2015 is the ideal forum for researchers,engineers,managers,technicians and students from the scientific and industrial communities from around the world to: meet and present advances in technology and its scientific support;     

联合作战计划和执行系统

全球指挥控制系统(GCCS)实施当前美国海军网络中心战信息基础设施的联合计划网络。联合作战计划和执行系统(JOPES)支持GCCS实现联合计划。JOPES有两类计划：时间不限的精密预案计划生成作战计划、方案计划或职能计划；时间敏感的危机行动计划生成作战命令或战役方案。前者在和平时期创建的作战计划是后者的计划基础，加速应付危机的能力。     

Eastbound or westbound ?

In terms of equal sailing distances, where is the inflexion when ships depart from ports in the Asian Continent to New York via Suez and/or Panama？
The answer is China South Port Group （Hong Kong, Shenzhen and Guangzhou）.     

Recent progress on wave induced loading measurements in warships

Recent measurements of wave induced hull strain and flexure in RN warships are presented together with the derivation of the current design criteria for extreme hull girder bending loads. The history of the development of the shipboard instrumentation used is given and recent developments to improve the quality and ease of analysis of the data are described. An unexpectedly high transverse asymmetry in the longitudinal strains measured in destroyers is shown to be the result of a combination of vertical and lateral bending in oblique seas. Finally recent theoretical comparisons between the loading of Deep-Vee hulls and conventional UK rounded bilge hulls are presented which demonstrate the higher loading experienced by this type of hull form.     

桥梁防撞设施物理模型试验

物理模型试验是预报防撞设施所受撞击力及优化设计方案的主要方法之一。结合杭州湾大桥柔性防撞设施及东海大桥独立式防撞体设计方案,阐述了船—防撞体撞击试验的基本原理、方法、试验方案及相关试验结果。提出了柔性防撞系统的优化方案。试验结果表明,该方案经济有效,可供预报类似桥梁防撞设施撞击力时参考。     

印尼某电厂码头水工建筑物设计

印尼某电厂项目码头水工建筑物包括码头、防波堤和护岸等主要组成部分。在该项目水工建筑物的设计过程中,综合考虑当地的自然条件、施工能力和材料来源等因素,不断优化结构选型和结构断面。根据不同使用要求,护岸分别采用直立式和斜坡式2种结构型式,推荐的设计方案节省投资、施工方便,可供同类工程设计参考。     

Impact of regulation on the performances of long-distance transport services: A comparison of the different approaches in Sweden and Norway

Despite the many socio-economic similarities between Sweden and Norway, differences in jurisdiction, organisation, cooperation, and financing of long-distance passenger train and coach services have led to the development of four distinctively different ways of serving the markets. This paper describes how the train and coach markets have developed in the two countries, with emphasis on regulatory and industrial structure and a couple of performance variables.Looking at passenger rail, both countries separated infrastructure from operation over a decade ago. However, while Norwegian rail is characterised by an almost monopoly supplier, rail services in Sweden are partly decentralised to the responsibility of county authorities and are widely subjected to competitive tendering. The rest of the network is about to be opened up for on-the-track competition. Swedish Rail (SJ) has spent the last decades consolidating its core business (passenger rail) and sold out its other businesses. In contrast, the Norwegian state rail (NSB) has expanded its business to become a major bus operator and property owner, with extensions also into the Swedish market.The coach industry was more recently deregulated in both countries. The Swedish coach market is dominated by privately owned companies operating services to and from Stockholm. In Norway, state-owned NSB is a major coach operator on medium distance routes, and is also the largest partner of Nor-Way Bussekspress which totally dominates long-distance coach services. Further, the Norwegian coach market is characterised by cross-ownership and cooperation which has enabled an extensive route network which covers most of Norway.We find distinct differences in achievements in the two modes and in the two countries. Swedish rail services have succeeded in winning market shares and in renewing and developing both infrastructure and service levels to a greater extent than the Norwegian model. On the other hand, the Norwegian coach market seems to be more developed and efficient compared to its Swedish counterpart.The paper concludes with a discussion on the possible links between the different approaches and the performance observed, with the aim to stimulate further and more detailed research on some important issues.     

开放式数据挖掘系统模型

目前国内已经出现了少量的数据挖掘相关产品。国内数据挖掘软件无论从数量还是质量上比较，都与国外软件存在着较大的差距。随着数据仓库技术的普及，数据挖掘应用的需求越来越强烈，如何缩短这种差距，研发数据挖掘软件产品成为国内业界的一个重要问题。通过引用目前国际通用数据挖掘标准技术来构建开放式的数据挖掘系统模型，该系统模型从可扩展性、可重用性、易用性等方面得到了加强。