| Before using numerical simulation software to analyze a problem, there are two procedures that must be done first, i.e. building a geometry model and generating a mesh under the geometry model. Both procedures are called the pre-process of numerical simulation, and they are major performance bottleneck of numerical simulations. In the numerical simulation platform software developed by our laboratory, called High End Digital Prototyping (HEDP), a pre-processing software HEDP/Pre is integrated, capable of providing suitable solutions for the common requirements of the pre-process of numerical simulations.Based on the previous work in our laboratory, the dissertation improves the framework design and software implementation of an Interactive Geometry User Environment (IGUE), which is the core module of HEDP/Pre, and provides some enhanced algorithms for some key technologies of the IGUE. General speaking, there are three parts of work involved in this dissertation as below:(1) By introducing a common geometry service layer between CAD and CAE systems, a type of CAD/CAE integration framework with layered software architecture is presented. Combined with some data exchange interfaces and geometry repair algorithms, HEDP/Pre is integrated with CAD systems efficiently.(2) Some common geometry modeling tools and two types of rendering algorithms of trimmed surface integrated in the IGUE are discussed. One rendering algorithm is based on discretization of continuous parametric surfaces, and the other is based on the surface trimming APIs provided by OpenGL.(3) A geometry processing framework for mesh generation is presented, where some algorithms for the common requirements of mesh generation are integrated. Some mesh generation algorithms are linked with framework to demonstrate its validity.Finally, some computational fluid dynamics instances and computational solid mechanics instances are proposed to illustrate the effectiveness that the above work. |
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