In this work, a time-dependent remeshing strategy and a numerical method are presented for the simulation of the action potential propagation of the human heart. The main purpose of these simulations is to accurately predict the depolarization-repolarization front position, which is essential to the understanding of the electrical activity in the myocardium. A bidomain model, which is commonly used for studying electrophysiological waves in the cardiac tissue, will be employed for the numerical simulations. Numerical results are enhanced by the introduction of an anisotropic remeshing strategy. The illustration of the performance and the accuracy of the proposed method are presented using a 2-D analytical solution and a test case with re-entrant waves.
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http://dx.doi.org/10.1109/TBME.2007.905415 | DOI Listing |
IEEE Trans Vis Comput Graph
January 2024
Dr. KID is an algorithm that uses isometric decomposition for the physicalization of potato-shaped organic models in a puzzle fashion. The algorithm begins with creating a simple, regular triangular surface mesh of organic shapes, followed by iterative K-means clustering and remeshing.
View Article and Find Full Text PDFJ Mech Behav Biomed Mater
June 2022
School of Engineering, London South Bank University, 103 Borough Road, London, SE1 0AA, UK; Department of Mechanical Engineering, Indian Institute of Technology Guwahati, Guwahati, 781039, India; University of Petroleum and Energy Studies, Dehradun, 248007, India. Electronic address:
Contribution of finite element method (FEM) as a modelling and simulation technique to represent complex tribological processes has improved our understanding about various biomaterials. This paper presents a review of the advances in the domain of finite element (FE) modelling for simulating tribology, wear, cutting and other processes involving high-strain rate plastic deformation of metals used in bio tribology and machining. Although the study is largely focused on material removal cases in metals, the modelling strategies can be applied to a wide range of other materials.
View Article and Find Full Text PDFInt J Numer Method Biomed Eng
July 2021
LaBS, Dipartimento di Chimica, Materiali e Ingegneria Chimica "Giulio Natta", Politecnico di Milano, Milan, Italy.
Numerical simulations of cardiac blood pump systems are integral to the optimization of device design, hydraulic performance and hemocompatibility. In wave membrane blood pumps, blood propulsion arises from the wave propagation along an oscillating immersed membrane, which generates small pockets of fluid that are pushed towards the outlet against an adverse pressure gradient. We studied the Fluid-Structure Interaction between the oscillating membrane and the blood flow via three-dimensional simulations using the Extended Finite Element Method (XFEM), an unfitted numerical technique that avoids remeshing by using a fluid fixed mesh.
View Article and Find Full Text PDFJ Med Imaging (Bellingham)
March 2021
Université de Technologie de Troyes, Génération Automatique de Maillage et Méthodes Avancées (GAMMA), Institut National de Recherche en Informatique et en Automatique, Troyes, France.
The reconstruction of positron emission tomography images is a computationally intensive task which benefits from the use of increasingly complex physical models. Aiming to reduce the computational burden by means of a reduced system matrix, we present a list mode reconstruction approach based on maximum likelihood-expectation maximization and a sliced mesh support. The reconstruction strategy uses a fully 3D projection along series of 2D meshes arranged in the axial plane of the scanner.
View Article and Find Full Text PDFIEEE Trans Vis Comput Graph
March 2022
Triangle meshes are used in many important shape-related applications including geometric modeling, animation production, system simulation, and visualization. However, these meshes are typically generated in raw form with several defects and poor-quality elements, obstructing them from practical application. Over the past decades, different surface remeshing techniques have been presented to improve these poor-quality meshes prior to the downstream utilization.
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