著者

Yuya Hanaoka Momoko Nojiri Taku Itoh Susumu Nakata Keiko Watanabe

出版者

Japan Society for Simulation Technology

雑誌

日本シミュレーション学会英文誌 (ISSN:21885303)

巻号頁・発行日

vol.6, no.1, pp.195-214, 2019 (Released:2019-05-30)

参考文献数

10

被引用文献数

2

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To construct a model of metal foam that has rounded cells such as a real one, an implicit surface based modelling method has been proposed. In this method, uniformed points are first generated randomly by Poisson-disk sampling, and a Voronoi diagram is constructed from the points. In addition, an implicit function f (x) is generated in each of Voronoi cells by setting some constraints appropriately. An implicit surface is represented as f (x) = 0, and the constraints are set so that f (x) = 0 is generated inside each of Voronoi cells. In this model, walls of metal foam are represented by space between implicit surfaces of adjacent Voronoi cells. Rounded walls that have various thicknesses can be constructed by adjusting the constraints. In addition, the walls can be converted to a solid model constructed as tetrahedra filling the space.

著者

Yuya Hanaoka Taku Itoh Kohei Tateyama Susumu Nakata Keiko Watanabe

出版者

Japan Society for Simulation Technology

雑誌

日本シミュレーション学会英文誌 (ISSN:21885303)

巻号頁・発行日

vol.8, no.1, pp.143-153, 2021 (Released:2021-06-12)

参考文献数

11

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Recently, to generate metal foam models for either open or closed state, a sphere-function-based method and a radial-basis-function-based one have been proposed. In these methods, implicit functions are employed for representing shapes of metal foams. In this paper, these methods based on spheres and radial basis functions have similarly been extended by employing characteristics of implicit functions, so that open/closed states and their intermediates can be represented. It is an advantage of the extended methods that any states of metal foams can be represented by only one implicit function.

著者

Soichiro IKUNO Norihisa FUJITA Yuki KAWAGUCHI Taku ITOH Susumu NAKATA Kota WATANABE Hiroyuki NAKAMURA

出版者

The Japan Society of Plasma Science and Nuclear Fusion Research

雑誌

Plasma and Fusion Research (ISSN:18806821)

巻号頁・発行日

vol.6, pp.2401069, 2011-07-01 (Released:2012-01-23)

参考文献数

9

被引用文献数

1 1

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The variable preconditioned (VP) Krylov subspace method on multi Graphics Processing Unit (GPU) is numerically investigated. Besides, the linear system obtained by finite element method with an edge element is adopted for the problem. The results of computations show that VP conjugate gradient method on multi GPU demonstrated significant achievement than that of CPU. Especially, VP conjugate gradient method on multi GPU is 4.35 times faster than that of CPU. However, transmission rate between the PC using Gigabit Ethernet is the bottleneck of the performance.