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Computational material design of filled rubbers using multi-objective design exploration
Published in Alexander Lion, Michael Johlitz, Constitutive Models for Rubber X, 2017
M. Koishi, N. Kowatari, B. Figliuzzi, M. Faessel, F. Willot, D. Jeulin
The information on effective material properties and morphological design variables is helpful for the material design of filled rubbers. So, the objective of this work is to get the information using multi-objective design exploration (MODE). MODE has been already applied to tire design (Koishi et al. 2006 & Koishi et al. 2014). MODE consists of numerical simulation, multi-objective genetic algorithm and data mining technique, and is a methodology to discover an evolutional idea for making technical innovation. However, to apply MODE to material design, especially morphological design of filled rubbers, there are two big issues i.e. simulation models in which morphology of fillers can be changed parametrically and large-scale viscoelastic simulation. In this study, the issues were solved using multi-scale random model based on Poisson point process and complex FFT (fast Fourier transform) based scheme proposed by Figliuzzi et al. (2016). In addition, MODE for the morphological design of filled rubbers was conducted on TSUBAME, supercomputer at Global Scientific Information and Computing Center in Tokyo Institute of Technology.
An experimental study on oscillatory characteristics of young mangroves behind a portable reef
Published in Coastal Engineering Journal, 2023
Sindhu Sreeranga, Hiroshi Takagi, Shin-Ichi Kubota, Jun Mitsui
We ran a numerical hydrodynamic simulation using olaFlow, an extended module of OpenFOAM (Ver.6) (Higuera 2018). The source code was compiled on a supercomputer of Tokyo Institute of Technology (TSUBAME 3.0) with a peak performance of 24.3 Pflops (single precision). The volume-averaged Reynolds-averaged Navier – Stokes (VARANS) technique was incorporated into the conservation of mass (Eq. 1), and momentum (Eq. 2) equations for simulating two-phase incompressible turbulent flows in porous media (Higuera, Lara, and Losada 2014a).