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Reševanje parcialnih diferencialnih enačb s predoločeno RBF-FD metodo : magistrsko delo
ID Golob, Gašper (Author), ID Žagar, Emil (Mentor) More about this mentor... This link opens in a new window, ID Kosec, Gregor (Comentor)

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Abstract
V delu je predstavljena in eksperimentalno analizirana brezmrežna metoda predoločenih končnih diferenc, generiranih z radialnimi baznimi funkcijami (predoločenih RBF-FD). Ta za aproksimacijo operatorja uporablja radialne bazne funkcije. Cilj metode je numerično reševanje parcialnih diferencialnih enačb, ki opisujejo skalarna in vektorska polja. V nasprotju s klasičnim RBF-FD pristopom metoda temelji na predoločenem sistemu enačb, ki upošteva obnašanje operatorja na razširjeni množici točk. Eden od ključnih izzivov, ki se pojavi zaradi predoločenega sistema, je zagotavljanje natančnosti pri izpolnjevanju robnih pogojev. V ta namen se uporabi skaliranje, ki uteži vpliv robnih pogojev. V delu sta izpeljani dve različici metode, ki temeljita na povezavi z zveznim primerom. Učinkovitost obeh različic je preverjena na testnem primeru Poissonove enačbe in z analizo deformacije vpetega nosilca. Izvedena je primerjava s klasično RBF-FD metodo in analiza vpliva skaliranja na natančnost ocene. Na koncu se posvetimo še nekaterim podrobnostim implementacije metode, kot so uporabljene strukture in reševanje dobljenih linearnih sistemov enačb.

Language:Slovenian
Keywords:RBF-FD, končne diference generirane z radialnimi baznimi funkcijami, parcialne diferencialne enačbe, predoločen RBF-FD, brezmrežne metode
Work type:Master's thesis/paper
Typology:2.09 - Master's Thesis
Organization:FMF - Faculty of Mathematics and Physics
Year:2025
PID:20.500.12556/RUL-174321 This link opens in a new window
UDC:519.6
COBISS.SI-ID:250862595 This link opens in a new window
Publication date in RUL:01.10.2025
Views:148
Downloads:29
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Secondary language

Language:English
Title:Solving partial differential equations with the oversampled RBF-FD method
Abstract:
The work presents and experimentally analyzes a meshfree method of the oversampled Radial Basis Function-generated Finite Difference (oversampled RBF-FD) method. This method uses radial basis functions to approximate operators in order to numerically solve partial differential equations (PDE), which describe scalar and vector fields. In contrast to the classic RBF-FD approach, the method constructs an overdetermined system of linear equations that accounts for the behaviour of the operator on an extended set of points. One of the key challenges arising due to the overdetermined system is ensuring accuracy in the enforcement of boundary conditions. For this purpose, a scaling is used to weight the influence of the boundary conditions. Two variants of the method are derived, both of which are based on a connection with a continuous problem. Both versions are tested on the examples of the Poisson problem and the deformation of the cantilever beam. A comparison with the classic RBF-FD method is carried out, as well as an analysis of the influence of scaling on the accuracy of the approximation. Finally, we address some details of the implementation of the method, such as the data structures used and the approach used to solve the linear systems of equations.

Keywords:RBF-FD, radial basis function generated finite difference, partial differential equations, oversampled RBF-FD, meshless

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