浪、流作用下大型网箱结构强度的数值模拟

在不同的波浪、海流和海生物附着等环境载荷的作用下,大型网箱的位移、锚泊力及结构应力都会发生变化,而当网箱结构发生海生物附着后,网箱所受的载荷会增大,严重时会危及网箱的结构安全.为此,需要研究浪流作用下大型网箱的水动力响应及结构内力.建立单体水面网格锚碇网箱在浪流作用下的数值模型,分别研究波流、海流和海生物附着等因素对网箱的受力和运动的影响,并分析不同海况下网箱的极限强度.结果 表明,海流流速和海生物附着厚度对网箱的变形、运动和受力有较大的影响,且随着海生物附着厚度的增加,网箱的极限强度也越来越小.     

厦门环岛路前埔段护岸天力消浪块体结构的设计和应用

介绍现已建成的厦门市环岛路前埔段堤主体段即国际会展中心广场临海护岸,在招标竞选中所推荐采取的一种新型直立式结构－天力消浪块体结构。对其结构特点、断面型式与尺度的确定原则和方法进行分析和提示。     

网格结构对桥墩周围冲刷坑的促淤效果研究*

减少冲刷坑深度是桥梁设计与维护中常面临的一个重要问题。为了进一步探明促淤网格的安装位置等对桩墩局部冲刷坑促淤修复效果的影响,通过水槽试验研究促淤修复率随促淤网格安装位置、网孔大小等要素的变化特征。结果表明：促淤修复率受来流强度的影响不大,受网格的相对安装位置影响很大;为提高促淤网格的稳定性和促淤修复效果,促淤网格应安装在沙波波谷以下尽可能高的位置,以获得尽可能大的促淤容量,增大网格的促淤深度;网格的相对网孔孔径越小,网格安装位置对冲刷坑促淤修复效果的影响越显著。最后,提出了促淤网格防护下的最终促淤深度计算公式,为今后促淤网格的工程应用提供参考。     

专利名称:适用于深水卸荷式板桩岸壁结构的概化模型设计方法

深水卸荷式板桩岸壁结构的概化模型设计方法利用弹性连杆模拟地基土与结构之间的相互作用,简化了深水卸荷式板桩岸壁结构的计算模型;将土压力分为自重土压力和超载土压力分别进行计算,且同时考虑了卸荷作用和遮帘作用,从而能够更加合理准确的计算作用于结构的土压力,依据主动土压力理论,考虑卸荷作用和遮帘作用进行前墙的土压力计算。     

半潜嵌入球箱透空式块体消浪结构J谱波下的试验研究

为加强海水交换能力,在不影响海域景观达到消减波浪缓减海岸侵蚀目的下,基于物理实验模型提出了一种半潜嵌入球箱透空式块体消浪结构。结合此消浪结构在规则波作用下的消浪性能做对比,探讨了此消浪结构在J谱波作用下的消浪性能。试验结果表明,此消浪结构在J谱波下也具有良好的消浪效果,能够在一定程度上缓解海岸侵蚀。     

通过水下储能系统的蓄电池单元的流:三个接触的似花结构的球状物(英文)

An LES simulation of flow over an accumulator unit of an underwater compressed air energy storage facility was conducted. The accumulator unit consists of three touching underwater balloons arranged in a floral configuration. The structure of the flow was examined via three dimensional iso surfaces of the Q criterion. Vortical cores were observed on the leeward surface of the balloons. The swirling tube flows generated by these vortical cores were depicted through three dimensional path lines. The flow dynamics were visualized via time series snapshots of two dimensional vorticity contours perpendicular to the flow direction; revealing the turbulent swinging motions of the aforementioned shedding-swirling tube flows. The time history of the hydrodynamic loading was presented in terms of lift and drag coefficients. Drag coefficient of each individual balloon in the floral configuration was smaller than that of a single balloon. It was found that the total drag coefficient of the floral unit of three touching balloons, i.e. summation of the drag coefficients of the balloons, is not too much larger than that of a single balloon whereas it provides three times the storage capacity. In addition to its practical significance in designing appropriate foundation and supports, the instantaneous hydrodynamic loading was used to determine the frequency of the turbulent swirling-swinging motions of the shedding vortex tubes; the Strouhal number was found to be larger than that of a single sphere at the same Reynolds number.