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1、 SuperGen Marine Workpackage 2 (T2.3.4) An Appraisal of a Range of Fluid Modelling Software A. P. McCabe October 2004 Department of Engineering Lancaster University LA1 4YR U.K. 本页已使用福昕阅读器进行编辑。 福昕软件( C ) 2 0 0 5 - 2 0 1 0 ，版权所有， 仅供试用。 SuperGen Marine An Appraisal of a Range Workpackage 2 of Fluid Mo
2、delling Software CONTENTS 1. Introduction 5 2. Marine Hydrodynamics 7 2.1. Potential Flow 7 2.2. Frequency Domain Solution 8 2.3. Time Domain Solution 9 2.4. Slender Elements Morisons Formula and Strip Theory 9 3. Computational Fluid Dynamics (CFD) 11 3.1. Grids and Meshes 11 3.2. Discretized soluti
3、on Methods 12 3.3. Multiple Fluids and Free Surfaces 12 3.4. Parallel Processing 13 4. Hydrodynamic Software Packages 14 4.1. AQWA 18 4.2. HYDROSTAR 23 4.3. MOSES 26 4.4. NEPTUNE 30 4.5. WADAM 33 4.6. WAMIT 37 4.7. WAVELOAD 41 4.8. TiMIT 45 4.9. Rough Guide 48 5. Computational Fluid Dynamics (CFD) S
4、oftware Packages 49 5.1. ADINA 53 5.2. CFD+ 56 5.3. CFD-ACE+ 60 5.4. CFX 64 5.5. EFD.Lab 68 5.6. FLUENT 72 Lancaster University 3 Department of Engineering SuperGen Marine An Appraisal of a Range Workpackage 2 of Fluid Modelling Software 5.7. PHOENICS 76 Appendices A.1. Hydrodynamic Software Directo
5、ry 82 A.2. CFD Software Directory 83 A.3. Trademarks 84 Lancaster University 4 Department of Engineering SuperGen Marine An Appraisal of a Range Workpackage 2 of Fluid Modelling Software 1. Introduction The design of marine energy converters (MECs) eventually requires the calculation of values such
6、as forces and motion amplitudes in order to assess the performance of the device and its suitability for the purpose. The complex nature of the environment within which MECs work, and the consequential complicated mathematical description of it, necessitates the use of computer methods to solve thes
7、e problems. Many programs have been devised to solve fluid dynamics problems of this nature, some application- specific, others of an extremely general character. Some programs have been produced by research departments mainly for in-house use, others have been developed commercially and are on gene
8、ral sale. There are hundreds of them, so some selection has been unavoidable, though it is hoped that those selected form a representative group. The range of software packages included in this appraisal has been limited, in the main, to commercially available programs, so that it can be assumed tha
9、t full validation and verification have been carried out. Of course, every rule must have an exception, and, in this case, the exception is the inclusion of TiMIT, a non-commercial time-domain hydrodynamics program produced by the Massachusetts Institute of Technology (MIT). This has been included p
10、artly out of academic interest, and partly because of the access MIT give to the theoretical background to the program, which provides much information for a newcomer to the subject. No attempt has been made to make any sort of comparison between different software packages. To do so would entail, o
11、n the one hand, arguments involving both arcane mathematical analyses and equally arcane computational methodologies, and, on the other hand, the assessment of subjective matters such as user-friendliness or learning curves. In addition, the packages vary greatly in terms of price and features offer
12、ed, such that comparison is rendered virtually meaningless. This appraisal, therefore, tries to present each program using a standardized description so that the asserted capabilities are expressed in a clear and concise manner. A directory is included to provide prospective users with contacts wher
13、e more detailed information may be obtained. In marine energy conversion applications, two main categories of software can be used. These are hydrodynamics software and computational fluid dynamics (CFD) software. The former uses mathematical analysis of a much more specialized case than the latter.
14、 Hydrodynamics programs are generally used in the investigation of fixed or floating bodies in the presence of gravitationally-driven waves. Section 2 gives a basic description of the derivation of the theory behind marine hydrodynamics, without expounding mathematically. The intention is to introdu
15、ce the terms for the values produced by the programs, and indicate where they fit into the theory. CFD software packages are designed to solve general equations for unsteady, compressible, viscous flow in one or more fluids and are generally used in the investigation of submerged machinery and struc
16、tures in the presence of significant flows such as tidal currents. Because of their general nature, these programs are usually differentiated by the computational methods that they use. A basic description of these approaches is given in Section 3, again more as a clarification of terminology than a technical analysis. Section 4 describes a selection of Hy
