Multiblock Generation For Hexahedral Meshing Of Irregular Profile

Mortadza, Siti Fatimah Khadijah (2019) Multiblock Generation For Hexahedral Meshing Of Irregular Profile. Project Report. Universiti Teknikal Malaysia Melaka, Melaka, Malaysia. (Submitted)

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Abstract

Discretization of the computer aided design (CAD) model into smaller elements are commonly referred as the meshing process. The meshing process is a critical strategy for finite element (FE) modelling and simulation. An appropriate meshing technique includes apportioning the basic model into perfect element that enable estimation from any FE application. One of the method to evaluate the mesh quality is using the determinant of Jacobian value. Mesh element with negative Jacobian number alludes to a very distorted element, while positive Jacobian number demonstrates perfect mesh element and can be executed for finite element simulation. The hexahedral and tetrahedral element is among the component that are usually chosen for object meshing. Unlike hexahedral component, tetrahedral component requires more number of element to completely characterize the model’s geometry. Higher element numbers resulted to more computational time and higher simulation cost. However, appointment of hexahedral elements to geometry with irregular profile is very challenging since the high curvature locale will usually lead to loss of mesh constancy, misshaped component and poor mesh quality. For higher structural complexity, more time is required to create a fully-hexahedral mesh model. As the structural complexity of the profile increases, the current meshing technique may be insufficient. Therefore, the aim of this research is to create an algorithm that can assist the fully-hexahedral meshing process for geometry with irregular surface profile by utilizing the building block approach. A fully-hexahedral mesh will be built up with reference to the building block which is built in reference to the CAD model with irregular profile, and the mesh quality will be assessed based on the determinant of the Jacobian value. The results of the study have shown that the number of distorted element produced has been lowered using the proposed technique. The results obtained were evaluated based on the Jacobian value obtained after discretization process. Jacobian value will determine whether the quality of a mesh surface meets the requirements for the simulation process. The methods used are closely related to the use of the mapping block technique that has been widely used in previous studies.

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