In this paper , the theory of slender bodies was used to calculate hydrodynamic forces and to numerically simulate the underwater trajectory of supercaviting bodies , the motion stability of supercaviting bodies was analyzed , too 本文应用细长体理论计算航行体在超空泡状态下的流体动力，成功类比了超空泡状态下的航行体水下弹道。
In this thesis , the application of fiber suspension and its research history are reviewed as well as its current research situations . the thesis also demonstrates in details the slender - body theory that is widely used under low re number conditions 本论文阐述了纤维悬浮流的应用意义、研究历史与研究现状，对低雷诺数下广泛应用的细长体理论的基本原理及其应用进行了详细介绍。
Using 2 - d strip method and the high - speed slender body theory , the heaving motion responses in regular wave of ship with combined appendage are computed . the results are compared with the results of naked ship hull , and the anti - pitching effect of combined appendage is validated . a method of optimizing the seakeeping is provided from the aspect of the ship hull 因此本文针对船舶耐波性能的优化，提出了一种减纵摇组合附体，将半潜艏和艏鳍安装在常规单体船上，初步阐述了半潜艏和艏鳍的水动力作用机理，并按照二维切片法和高速细长体理论计算了加装组合附体后，船舶在规则波中的垂向稳态运动响应，与裸船体的结果进行了比较，验证组合附体的减摇效果，从船体本身出发提供了?种优化船舶耐波性的方法； 3
Many test cases are calculated to verify the above study . the cases are either real or standard testing models , including multi - element airfoil , wing - body configuration , cone / cylinder missile model and 3 - d high - lift systems , etc . the results of present calculation are in good agreement with experiment data , and show flexibility and accuracy of the approaches . base on the cartesian grids , this thesis has targeted the development and integration of many algorithms and techniques such as adaptive refinement , omni - tree data structure , hybrid grid method , etc . an analysis software and research methods are designed and developed for the steady - unsteady and viscous - inviscid flow complex systems and configuration 7 .运用上述研究成果和结论，进行了大量算例的实验验证，外形范围包括多种标模与型号，涉及多段翼型、 m6机翼、细长体模型、翼身组合体、两段机翼增升标模、带缝翼和襟翼的三段增升翼身组合体等复杂外形，计算结果均与实验吻合良好，充分说明了本文发展的各种算法、流场求解、网格生成方法的正确性和鲁棒性。
Firstly , when the pipe flow was laminar , the movement of fibers was computed in the 2 - d force formulae that were deduced from the slender body theory and in 3 - d integral method . results revealed that angles between fibers " axis and the orientation of flow would concentrate gradually on a low number as the re numbers increased . that is , the axis of fibers would rotate toward the orientation of flow 首先，当管道内流动为层流时，分别利用从细长体理论出发得出的纤维二维受力公式和三维分段积分计算方法模拟了大量纤维在流场中的运动，然后在最终时刻统计了纤维的偏角分布，并得出相同的结果：随着re数的增加，纤维粒子的偏角逐渐集中于小角度，即纤维轴线方向越来越集中于流向，此结果与实验吻合较好。
This thesis researches on the stability of fibre suspensions applying theoretical , numerical and experimental methods . first the linear stability analysis is performed to fibre suspensions utilizing flow stability , slender - body and orientation tensor theories . the governing equations of channel and pipe suspensions of different stability handling modes and tensor closure approximations are derived 首先综合应用流体动力稳定性理论、细长体理论以及纤维方向张量工具，对纤维悬浮流进行线性稳定性分析，推导槽流和管流的稳定性方程，并对槽流导出在不同的稳定性分析模式以及不同的方向张量封闭格式下的多种形式方程。
On the basis of this analysis the radiation and diffraction forces of the ship are calculated using these three methods and compared . at the same time vertical ship motions in regular wave are solved by these three methods . the results are compared to test each method ' s availability and suitability , thus the theoretical basis of optimize design of sea - keeping performance is provided 分别介绍了二维切片法、高速细长体理论和三维理论的基本原理，分析了三种不同方法各自的适用性，在此基础上分别计算了船舶的辐射力和绕射力，比较了这三种方法的计算结果，为不同营运目的的船舶耐波性计算提供陕速有效而实用的计算方法；同时应用三种方法计算了船舶在规则波中的垂向稳态运动响应，比较三种方法的计算结果，测试各种方法的有效性和适用性，为船舶耐波性的优化设计提供原始的理论基础； 2
