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| 1 | 基于非结构网格的高分辨率隐式算法研究及应用显示文摘采用LU-SGS隐格式离散N-S方程,求解过程引入超松弛系数。数值水槽试验研究发现,超松弛系数的引入可以提高计算结果收敛速度,其取值范围一般在1~1.3之间。应用LU-SGS算法,建立了高分辨率的大东港海域潮流泥沙数学模型,计算结果表明,该算法稳定性好,计算精度能够满足实际工程应用,具有模拟大范围海域潮流泥沙运动的能力。 | 路川藤 罗小峰 | 2015 | 海洋通报2015，34，1： | 16 |
| 2 | A semi-implicit three-dimensional numerical model for non-hydrostatic pressure free-surface flows on an unstructured,sigma grid显示文摘A semi-implicit 3-D numerical formulation for solving non-hydrostatic pressure free-surface flows on an unstructured,sigma grid is proposed.Pressure-splitting and 9 semi-implicit methods are inherited and reformed from Casulli's z-coordinate formulation.The non-orthogonal sigma-coordinate transformation leads to additional terms. The resulting linear system for the non-hydrostatic correction is diagonally dominant but unsymmetric,and it is solved by the BiCGstab method.In contrast with z-coordinate non-hydrostatic models,the new model fits vertical boundaries much better,which is important for the long-time simulation of sediment transport and riverbed deformation.A lock-exchange density flow is computed to determine whether the new scheme is able to simulate non-hydrostatic free-surface flows.The new model is further verified using the field data of a natural river bend of the lower Yangtze River.Good agreement between simulations and earlier research results,field data is obtained, indicating that the new model is applicable to hydraulic projects in real rivers. | De-chao HU De-yu ZHONG Guang-qian WANG Yong-hui ZHU | 2013 | International Journal of Sediment Research2013，28，1： | 8 |
| 3 | 淹没式取水工程附近水流运动三维数值模拟显示文摘采用三维水流模型,模拟了淹没式取水工程(单侧引水箱、蘑菇头)附近三维空间内的水流运动。计算发现,取水工程处表层水体中水平流速增量与取水吸水方向可相同,也可相反。结合模拟结果和明渠水流基本理论,探讨了取水口附近水流变化现象的形成机理。理论分析表明,黏性(垂向扩散)、动水压力作用是产生上述现象的决定因子,它们对表层水流变化的驱动方向相反,其综合作用效果随着取水工程之上水深h'的不同而不同。对于单侧引水箱,当h'较小时,黏性扩散作用占主导,取水层与表层水流流速增量方向一致;当h'较大时,动水压力作用占主导,取水层与表层水流流速增量方向相反。较之单侧引水箱,蘑菇头从水平各个方向均吸水,导致了在蘑菇头正上、正下方水域形成2个压力集中区。环绕着这2个区域边缘,靠近取水口的水层由于黏性扩散向中心运动,远离取水口的水层(底层、表层)被向外压出。 | 胡德超 李小娟 廖洋生 | 2013 | 长江科学院院报2013，30，10： | 2 |
| 4 | A NOVEL ADAPTIVE σ COORDINATE MODEL AND ITS APPLICATIONS TO WAVE AND STRUCTURE INTERACTION显示文摘In this paper, a novel adaptive mesh σ coordinate model is proposed for the studies of Wave and Structure Interaction (WSI). The model is validated by using the case of a solitary wave movement in an open channel with constant water depth and the case of nonbreaking solitary wave propagating over a step. Numerical results agree well with the analytical solutions obtained based on the Boussinesq theory, the laboratory data and other numerical model results. The proposed model is then used to study a solitary wave interacting with a suspended fixed structure. | SU Xiao-hui ZOU De-gao ZHANG Jian-tao LESCHKA Stefan LIN Peng-zhi ZHANG Kai-lin | 2012 | Journal of Hydrodynamics2012，24，3： | 0 |
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