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In this paper, a theoretical investigation of the drag and noise reduction by riblets is carried out, and these numerical results are compared with those obtained from experiments with riblets in water tunnel, and it is found that they agree with each other in tendency and numerical value.

本文从理论上分析了条纹表面的减阻降噪特性，并将计算结果与水洞模型贴膜实验进行了对比，两者在趋势和数值上基本一致。

In order to survey the numerical diffusion induced by mesh rezoning and variables remap in ALE method,some calculations had been done,and comparisons show that the smoothing does exist,but the numerical dissipation is not serious,it do no harm to physical picture.

为考察ALE方法网格重分、物理量重映导致的数值扩散对计算精度的影响，进行了一些计算比较，结果显示，虽然存在一定程度的抹平现象，但是网格重分带来的数值耗散并不大，对物理图象并没有显著的影响。

Company area 12,000 square meters, the floor space 8000 square meters, is engaged in the specialized production plate work series product the enterprise, for casting machine, the numerical control processing center and so on equipment production necessary ..existing specialized design advanced CAD the CAM technology, has the design manufacture high difficulty plate work the ability, dozens of University of Taiwan numerical control plate cutter, the knee bend machine, the Dragon Gate mill, the ion cutter and so on the special purpose equipment.

公司占地面积12000平方米，建筑面积近8000平方米，是一家从事专业生产钣金系列产品的企业，为注塑机、数控加工中心等设备生产配套。现有专业设计先进的CAD、CAM技术，拥有设计制作高难度钣金的能力，数十台大型数控剪板机、折弯机、龙门铣、数控激光切割机等专用设备。

The Shanghai number permanent RJ mold has made the limited companyto be established since 1996, established Wicks the brandseries mold, passes through more than 10 years development, hasestablished the leading status in the national mold profession,unceasingly grows along with the company, we already become from thenumerical control knee bend mold to the numerical control ZTCM and the plate cutter bit omni-directional numerical controlplate work processing equipment cutting tool mold supplier.

上海数恒刃具模具制造有限公司自1996年成立以来，创立了威克斯品牌系列模具，经过十多年的发展，已在全国模具行业确立了领先地位，随着公司不断成长，我们已经成为从数控折弯模具到数控转塔冲模及剪板机刀片的全方位数控钣金加工设备刀具模具的供应商。

The Shanghai number permanent RJ mold has made the limited companyto be established since 1996, established Wicks the brandseries mold, passes through more than 10 years development, hasestablished the leading status in the national mold profession,unceasingly grows along with the company, we already become from thenumerical control knee bend mold to the numerical control ZTCM ＆ the plate cutter bit omni-directional numerical controlplate work processing equipment cutting tool mold supplier.

上海数恒刃具模具制造有限公司自1996年成立以来，创立了威克斯品牌系列模具，经过十多年的发展，已在全国模具行业确立了领先地位，随着公司不断成长，我们已经成为从数控折弯模具到数控转塔冲模及剪板机刀片的全方位数控钣金加工设备刀具模具的供应商。

The Shanghai number permanent RJ mold has made the limited companyto be established since 1996, established Wicks the brandseries mold, passes through more than 10 years development, hasestablished the leading status in the national mold profession,unceasingly grows along with the company, we already become from thenumerical control knee bend mold to the numerical control ZTCM ＆ the plate cutter bit omni-directional numerical controlplate work processing equipment cutting tool mold supplier.

上海急招大中专毕业生，月薪5000，企业订单培养100%推荐就业——赞助商链接上海数恒刃具模具制造有限公司自1996年成立以来，创立了威克斯品牌系列模具，经过十多年的发展，已在全国模具行业确立了领先地位，随着公司不断成长，我们已经成为从数控折弯模具到数控转塔冲模及剪板机刀片的全方位数控钣金加工设备刀具模具的供应商。

In the paper, based on reading and studying a great number of references about fluid dynamic technique and numerical computing methods of flow field, 3-D Numerical simulations and visual analysis of the flow field in hydraulic poppet valve with inside flow work condition were obtained by CFD software Fluent.

本文在参阅大量国内外有关计算流体力学和流场数值计算方法相关资料的基础上，用CFD软件Fluent对内流工况液压锥阀内部流场进行了三维数值模拟及可视化分析。

Cavitations is the major problems of designing water hydraulic valve, understanding the relationship between shape of valve and cavitations , avoiding cavitations is extremely important, this paper, the numerical simulation and visualization research of flow field is carried out to research relation between the flow field of poppet valve and the length of valve seat by finite volume numerical method.

气穴是研制水压阀存在的主要难题，认识阀口形状与气穴的关系，避免产生气穴现象是极其重要，本文应用有限体积数值计算方法针对阀座倒角长度变化对水压阀阀道内流场的影响进行数值模拟和可视化研究，得到了一些有益的结论：倒角长度的改变对阀口间隙以及阀芯锥面与柱面相接的地方的负压会产生比较大的影响

In test total pressure at entrance of nozzle and thrust are measured, which are calculated by numerical simulation and are good agreement with experimental data. So numerical simulation in this paper is very exact and effective.

测试了固体燃料冲压发动机喷管入口处的总压和推力变化，并与数值计算进行了对比研究，理论与试验结果吻合很好，说明了数值计算的正确性和有效性。

By practical engineering case,numerical analysis is done,and the natural frequency and the response to impact of the system are obtained.The numerical results show that the elastic deformation of the raft body will affect the dynamic character of the system,and the proposed model is more precise and judicious in engineering application.

结合具体的算例，求出了弹性浮筏隔振系统的固有频率和对不同冲击激励的响应，指出了筏体的弹性变形对系统动力学性能的影响，揭示了弹性模型的全面性和合理性。

By the time of its fall, most of the prisoners were writers who had written against the corruptions of the government.

到它被攻陷的时候，里面多数的犯人是写了反对政府贪污文章的作家。

The most obvious variation to ovum morphological character was that the color was changed from light green to sepiaceous in embryonic development, and all the ovums were almost hatched after 96h.

在胚胎发育过程中卵的形态特征最明显的变化是颜色从淡绿到深褐色，卵在发育96h后卵基本全部孵化。