scholarly journals Local topological modification of hexahedral meshes. Part I: A set of dual-based operations

2008 ◽  
Vol 24 ◽  
pp. 14-33 ◽  
Author(s):  
Timothy J. Tautges ◽  
Sarah E. Knoop ◽  
Thomas J. Rickmeyer
Keyword(s):  
Hexahedral Meshes

Automatic 3-D Crack Propagation Calculations in Industrial Components: A Pure Hexahedral versus a Combined Hexahedral-Tetrahedral Approach

2007 ◽  
Vol 348-349 ◽  
pp. 45-48
Author(s):  
Guido Dhondt
Keyword(s):  
Crack Propagation ◽  
Computing Time ◽  
Propagation Direction ◽  
Hexahedral Elements ◽  
Crack Propagation Direction ◽  
Low Weight ◽  
Out Of Plane ◽  
Hexahedral Meshes ◽  
Crack Faces

In recent years, increased loading and low weight requirements have led to the need for automatic crack tracing software. At MTU a purely hexahedral code has been developed in the nineties for Mode-I applications. It has been used extensively for all kinds of components and has proven to be very flexible and reliable. Nevertheless, in transition regions between complex components curved cracks have been observed, necessitating the development of mixed-mode software. Due to the curvature of the crack faces, purely hexahedral meshes are not feasible, and therefore a mixture of hexahedral elements at the crack tip, combined with tetrahedral in the remaining structure has been selected. The intention of the present paper is to compare both methods and to point out the strength and weaknesses of each regarding accuracy, complexity, flexibility and computing time. Furthermore, difficulties arising from the out-of-plane growth of the crack such as the determination of the crack propagation direction are discussed.

On the Reduction of the Pre-Processing Effort and the Application of a Contact Meshing Approach for Complex Jet Engine Component Assemblies

2014 ◽  
Author(s):  
W. Hufenbach ◽  
A. Hornig ◽  
H. Böhm ◽  
A. Langkamp ◽  
A. Keskin
Keyword(s):  
Significant Proportion ◽  
Work Effort ◽  
Positive Effects ◽  
Tetrahedral Elements ◽  
Automated Method ◽  
Geometry Decomposition ◽  
Hexahedral Meshes ◽  
Complex Structural ◽  
Processing Effort ◽  
Pressure Compressor

A significant proportion of the work effort for finite element (FE) analysis is spent for pre-processing activities, especially for complex structural components and component assemblies. An exclusive use of hexahedron (hex) elements increases the meshing effort substantially compared to tetrahedral elements. An automated method to generate high quality hexahedral meshes for an arbitrary geometry does not exist. In this work, commercially available FE software tools for meshing were investigated with the focus on an advantageous pre-processing effort. The evaluation showed that the software package NX (Siemens PLM Software) offers robust advanced semiautomatic hex meshing capabilities. Furthermore, a Contact Meshing Approach (CMA) was elaborated to reduce the effort of the challenging and time-consuming geometry decomposition significantly. Using the example of an intermediate pressure compressor it can be shown that the pre-processing effort time can be reduced up to 75%. Due to the independent meshes, element transitions in the geometry become redundant. This results in lower total element numbers and higher mesh qualities and subsequently leads to more efficient calculations. Moreover, the increased element quality has positive effects on the result quality.

scholarly journals A provably stable discontinuous Galerkin spectral element approximation for moving hexahedral meshes

2016 ◽  
Vol 139 ◽  
pp. 148-160 ◽  
Author(s):  
David A. Kopriva ◽  
Andrew R. Winters ◽  
Marvin Bohm ◽  
Gregor J. Gassner
Keyword(s):  
Discontinuous Galerkin ◽  
Spectral Element ◽  
Element Approximation ◽  
Hexahedral Meshes

A Practical Technique for Generating Hexahedral Meshes

2012 ◽  
Vol 238 ◽  
pp. 214-217
Author(s):  
Xin Li Bai ◽  
Bing Ma ◽  
Jiang Yan Li
Keyword(s):  
Boundary Condition ◽  
Processing Method ◽  
Hexahedral Meshes ◽  
Implementation Method

A practical technique for generating hexahedral meshes automatically is proposed in this paper. The technique is accomplished by secondary subdivision of a tetrahedron. The implementation method from tetrahedron to hexahedron through secondary subdivision is discussed. The method and treatment of boundary condition formula are derived, and the simple and practical load processing method is given. Finally a tetrahedron-based hexahedron automatic meshing program is developed. Engineering examples shows that the calculation accuracy of the method is comparatively high. The proposed method can be applied to any entity.

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