Grid-based computational simulations often use hybrid unstructured grids consisting of various types of elements. Most commonly used elements are tetrahedral, pentahedral (namely, square pyramids and right triangular prisms) and hexahedral elements. Extracting isosurfaces of scalar fields defined on such hybrid unstructured grids is often done using indirect methods, such as, (a) subdividing al...

Sweeping moving objects has become one of the basic geometric operations used in engineering design, analysis and physical simulation. Despite their relevance, computing the boundary of the set swept by a non-polyhedral moving object is largely an open problem due to well known theoretical and computational difficulties of the envelopes. We have recently introduced a generic point membership cl...

A new surface based approach to implicit surface polygonisation is introduced in this paper. This is applied to the reconstruction of 3D surface models of complex objects from multiple range images. Geometric fusion of multiple range images into an implicit surface representation was presented in previous work. This paper introduces an efficient algorithm to reconstruct a triangulated model of ...

Three-dimensional (3D) volume data has become increasingly common with the emergence and wide availability of modern 3D image acquisition techniques. The demand for computerized analysis and visualization techniques is constantly growing to utilize the abundant information embedded in these data. This thesis consists of three parts. The first part presents methods of analyzing 3D volume data by...

In this work, the application of harmonic balance technique is demonstrated for transonic buffet cases. The method represents an alternative to time-marching simulations that are expensive complex flow Here applied on different test cases with inherently unsteady flows, i.e. two aerofoil configurations undergoing buffet. A gradient-based, variable time period used estimate frequency oscillation...

it is the instructor’s responsibility to instill a positive attitude and set high expectations for all members, while helping students grow and become better musicians. If difficulty is the modern measuring stick for superiority, then one can certainly argue that multi-tenors are the most challenging instrument to play, while others will say the bass drum requires the most demanding skill. Alth...