Searched for: subject:"NURBS"
(1 - 17 of 17)
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Agromayor, Roberto (author), Anand, N. (author), Müller, Jens Dominik (author), Pini, M. (author), Nord, Lars O. (author)
Turbomachinery design is increasingly carried out by means of automated workflows based on high-fidelity physical models and optimization algorithms. The parametrization of the blade geometry is an essential aspect of such workflows because it defines the design space in which an optimal solution can be found. Currently, parametrization...
journal article 2021
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Speleers, Hendrik (author), Toshniwal, D. (author)
In this paper, we describe a general class of C<sup>1</sup> smooth rational splines that enables, in particular, exact descriptions of ellipses and ellipsoids — some of the most important primitives for CAD and CAE. The univariate rational splines are assembled by transforming multiple sets of NURBS basis functions via so-called design...
journal article 2021
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De Lazzari, Elena (author), van den Boom, S.J. (author), Zhang, J. (author), van Keulen, A. (author), Aragon, A.M. (author)
Enriched finite element methods have gained traction in recent years for modeling problems with material interfaces and cracks. By means of enrichment functions that incorporate a priori behavior about the solution, these methods decouple the finite element (FE) discretization from the geometric configuration of such discontinuities. Taking...
journal article 2021
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Hosseini, Babak Sayyid (author), Möller, M. (author)
In this work, we consider a Cahn–Hilliard phase field-based computational model for immiscible and incompressible two-component liquid flows with interfacial phenomena. This diffuse-interface complex-fluid model is given by the incompressible Navier–Stokes–Cahn–Hilliard (NSCH) equations. The coupling of the flow and phase field equations is...
conference paper 2020
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Feij, Christiaan (author)
The case of the flow around a rotating circular cylinder is very complex. This thesis investigates the properties of a fluid flow for Reynolds numbers ranging from 50 to 400. Numerical simulations are performed using a combination of isogeometric analysis and the residual-based variational multiscale method, providing high accuracy. The results...
master thesis 2019
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Xia, Y. (author), Wu, Yue (author), Hendriks, M.A.N. (author)
In current optimization methods for free-form shells, the shape and topology are usually optimized separately. These methods are based on the assumption that the shape and topology of a shell influence each other only slightly, but this is not always correct. Moreover, different parameterization models are used in the shape optimization and...
journal article 2019
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De Lazzari, Elena (author)
Generalized finite element methods have proved a great potential in the mesh-independent modeling of both weak and strong discontinuities, such as the ones encountered when treating materials with inclusions or cracks. By removing the constraint of a conforming mesh, more freedom is offered to modeling exact geometries by means of splines....
master thesis 2017
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van Velden, Karel (author)
Airfoil optimizations require costly high-fidelity solvers. By replacing the expensive solver with a cheap to evaluate surrogate model genetic optimization becomes feasible and a global optimum can be obtained. This thesis investigates applicability of surrogate model based optimization for airfoil optimization and provides recommendations...
master thesis 2017
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Maljaars, J.L. (author)
Over the years, the installed capacity of offshore wind turbines is increasing rapidly. However, the Levelized Costs Of Energy (LCOE) is still higher than the LCOE of traditional energy production methods like nuclear power or energy from coals or gas. This research focuses on a further decrease of the LCOE, by minimizing the mass of a monopile...
master thesis 2017
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Li, Q. (author), Wu, Yue (author), Borgart, A. (author)
Hanging models play an important role in shaping a structure since a very early age, and were favored by A. Gaudi, H. Isler, F. Otto and other architects or engineers. Nowadays, with the development of numerical analysis theory and computer technique, it is more accurate and convenient to simulate these physical models via numerical means. Based...
conference paper 2015
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Van Hoydonck, W.R.M. (author)
This thesis contains the results of research in the area of rotorcraft aerodynamics with a focus on method development related to the vortical wake generated by rotor blades. It is applied to a vortex tube representation of the wake (using a single NURBS surface) and a simplified filament wake model where only the tip vortices are taken into...
doctoral thesis 2013
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Malagu, M. (author), Benvenuti, E. (author), Simone, A. (author), Tralli, A.M. (author)
Size effects observed in the mechanical behavior of micro- and nanostructures cannot be modeled by means of classical continuum mechanics. Enhanced continuum models based on nonlocal integro-differential or higher-order differential formulations have shown, on the contrary, that size effect can be modeled when appropriate modifications to the...
conference paper 2012
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Nagy, A.P. (author), Abdalla, M.M. (author), Gürdal, Z. (author)
The isogeometric paradigm is aimed at unifying the geometric and analysis descriptions of engineering problems. This unification is brought about by employing the same basis functions describing the geometry to approximate the physical response. Non-uniform rational B-splines (NURBS) are commonly used for this purpose and are adopted in the...
journal article 2010
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Valkering, E.E.J. (author)
Several approaches have been made towards directly ray tracing NURBS-surfaces without first tessellating the surface. Some of these approaches have been implemented on the GPU in order to achieve interactive rates. This thesis presents CNRTS, a CUDA-based system capable of ray tracing NURBS-surfaces. In this system, the surfaces are subdivided...
master thesis 2010
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Schreurs, P.H.M. (author)
The 'Commuter Retreat' project was developed in the context of the Border Conditions graduation studio. This studio emphasizes on an experimental approach to architecture, based on the development of specific techniques of representation to describe specific urban and architectural phenomena. The first part of the studio focuses on the urban...
master thesis 2009
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Akkerman, I. (author), Bazilevs, Y. (author), Calo, V.M. (author), Hughes, T.J.R. (author), Hulshoff, S. (author)
This paper examines the role of continuity of the basis in the computation of turbulent flows. We compare standard finite elements and non-uniform rational B-splines (NURBS) discretizations that are employed in Isogeometric Analysis (Hughes et al. in Comput Methods Appl Mech Eng, 194:4135–4195, 2005). We make use of quadratic discretizations...
journal article 2007
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Sevilla, R. (author), Fernández-Méndez, S. (author), Huerta, A. (author)
An improvement of the classical finite element method is proposed. It considers an exact representation of the geometry by means of the usual CAD description of the boundary with Non-Uniform Rational B-Splines (NURBS). For elements not intersecting the boundary, a standard finite element interpolation and numerical integration is used....
conference paper 2006
Searched for: subject:"NURBS"
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