Wa KWOK - Academia.edu (original) (raw)

Papers by Wa KWOK

Research paper thumbnail of Combined Laplacian and Optimization-based Smoothing for Quadratic Mixed Surface Meshes

Research paper thumbnail of A Simple And Effective Mesh Quality Metric For Hexahedral And Wedge Elements

This paper presents a mesh quality metric for hexahedral and wedge elements. A series of studies ... more This paper presents a mesh quality metric for hexahedral and wedge elements. A series of studies was carried out to relate the proposed metric with the solution errors. During the studies, the metric was also compared with the aspect ratio, the warping factor and the control number. The results show that the metric can be used to identify invalid as well as potential poor quality elements, which may cause larger solution errors.

Research paper thumbnail of QMCF: QMorph Cross Field-driven Quad-dominant Meshing Algorithm

Procedia Engineering, 2014

We propose a new method for generation of quadrilateral meshes. Our algorithm takes a triangle me... more We propose a new method for generation of quadrilateral meshes. Our algorithm takes a triangle mesh generated on a computer-aided design surface together with a size field as input. A novel cross field, defined on vertices of the triangle mesh, is derived from both curvature directions and constraints on the boundary. Our algorithm uses a modified QMorph algorithm for quad dominant meshing, to follow size field and to align edges with the cross field previously computed.

Research paper thumbnail of Construction of an objective function for optimization-based smoothing

Engineering with Computers, 2004

ABSTRACT

Research paper thumbnail of Design and Implementation of a Corporate Mesh Object

Proceedings of the 14th International Meshing Roundtable

Today, finite element technologies allow engineers to analyze complex assemblies and subsystems. ... more Today, finite element technologies allow engineers to analyze complex assemblies and subsystems. With CPU power constantly increasing, it is not unreasonable to state thatthe engineer will hope to analyze the whole complex system, such as an entire automobile, in a singles tudy. This study mayi nclude parameteric design, result animation, crash analysis, and so on. The traditional mesh data structure, which mainly serves a particulart ype of mesh algorithm, is far from enough to meet the challenges of tomorrow. This paper mainly focuses ons toring, accessing, and manipulating mesh dataw ithint he vast scope of the analysis system for multiple purposes, such as meshing generators, solvers, pre-and postprocessors, and so on. It detailst he decision-making put into the designo ft he ANSYS Corporate Mesh Object, the programming methods used to implement thosed esigns, and future enhancements planned to meet ever-changing requirements.

Research paper thumbnail of Fully Automatic Adaptive Mesh Refinement Integrated into the Solution Process

Finite element analysts and designers need to feel confident in the results of their analyses bef... more Finite element analysts and designers need to feel confident in the results of their analyses before sending a product to prototype or production. Mesh discretization can greatly influence the desired results. In this paper we present framework for adaptive mesh refinement to obtain FEA results with a desired accuracy. The process involves adaptively refining the mesh based on solution error norms until the result desired converges to certain accuracy. The adaptive refinement/meshing process must be fully automatic and very robust. We present an exhaustive method to create a fully automatic and integrated process that takes advantage of many of the mesh refinement and mesh optimization algorithms found in literature. The results of the process provide the user with the desired accuracy in the smallest number of iterations possible.

Research paper thumbnail of Combined Laplacian and Optimization-based Smoothing for Quadratic Mixed Surface Meshes

Research paper thumbnail of A Simple And Effective Mesh Quality Metric For Hexahedral And Wedge Elements

This paper presents a mesh quality metric for hexahedral and wedge elements. A series of studies ... more This paper presents a mesh quality metric for hexahedral and wedge elements. A series of studies was carried out to relate the proposed metric with the solution errors. During the studies, the metric was also compared with the aspect ratio, the warping factor and the control number. The results show that the metric can be used to identify invalid as well as potential poor quality elements, which may cause larger solution errors.

Research paper thumbnail of QMCF: QMorph Cross Field-driven Quad-dominant Meshing Algorithm

Procedia Engineering, 2014

We propose a new method for generation of quadrilateral meshes. Our algorithm takes a triangle me... more We propose a new method for generation of quadrilateral meshes. Our algorithm takes a triangle mesh generated on a computer-aided design surface together with a size field as input. A novel cross field, defined on vertices of the triangle mesh, is derived from both curvature directions and constraints on the boundary. Our algorithm uses a modified QMorph algorithm for quad dominant meshing, to follow size field and to align edges with the cross field previously computed.

Research paper thumbnail of Construction of an objective function for optimization-based smoothing

Engineering with Computers, 2004

ABSTRACT

Research paper thumbnail of Design and Implementation of a Corporate Mesh Object

Proceedings of the 14th International Meshing Roundtable

Today, finite element technologies allow engineers to analyze complex assemblies and subsystems. ... more Today, finite element technologies allow engineers to analyze complex assemblies and subsystems. With CPU power constantly increasing, it is not unreasonable to state thatthe engineer will hope to analyze the whole complex system, such as an entire automobile, in a singles tudy. This study mayi nclude parameteric design, result animation, crash analysis, and so on. The traditional mesh data structure, which mainly serves a particulart ype of mesh algorithm, is far from enough to meet the challenges of tomorrow. This paper mainly focuses ons toring, accessing, and manipulating mesh dataw ithint he vast scope of the analysis system for multiple purposes, such as meshing generators, solvers, pre-and postprocessors, and so on. It detailst he decision-making put into the designo ft he ANSYS Corporate Mesh Object, the programming methods used to implement thosed esigns, and future enhancements planned to meet ever-changing requirements.

Research paper thumbnail of Fully Automatic Adaptive Mesh Refinement Integrated into the Solution Process

Finite element analysts and designers need to feel confident in the results of their analyses bef... more Finite element analysts and designers need to feel confident in the results of their analyses before sending a product to prototype or production. Mesh discretization can greatly influence the desired results. In this paper we present framework for adaptive mesh refinement to obtain FEA results with a desired accuracy. The process involves adaptively refining the mesh based on solution error norms until the result desired converges to certain accuracy. The adaptive refinement/meshing process must be fully automatic and very robust. We present an exhaustive method to create a fully automatic and integrated process that takes advantage of many of the mesh refinement and mesh optimization algorithms found in literature. The results of the process provide the user with the desired accuracy in the smallest number of iterations possible.