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Wang, Z.; Sugiyama, Tomoyuki; Matsunaga, Takuya*; Koshizuka, Seiichi*
Computers & Fluids, 247, p.105646_1 - 105646_21, 2022/10
Times Cited Count：2 Percentile：19.38(Computer Science, Interdisciplinary Applications)Ito, Kei; Kunugi, Tomoaki*; Ohshima, Hiroyuki; Kawamura, Takumi*
Computers & Fluids, 88, p.250 - 261, 2013/12
Times Cited Count：24 Percentile：69.38(Computer Science, Interdisciplinary Applications)The PLIC (Piecewise Linear Interface Calculation) algorithm is one of the volume-of-fluid algorithms. However, the PLIC algorithm needs complicated geometrical calculations for the reconstructions of the interfaces in interfacial cells, and therefore, the PLIC algorithm on unstructured meshes have not been studied enough. In this paper, the authors propose a new PLIC algorithm on unstructured meshes with arbitrary-shaped cells. In the proposed PLIC algorithm, several methods are developed or implemented. In addition, the volume fraction transport is improved by developing a volume-conservative algorithm in which gas and liquid volumes are conserved perfectly during the transport. As a result of the verification and validation tests, it is confirmed that the proposed PLIC algorithm enables the numerical simulations of interfacial dynamic behaviors with high accuracy even on unstructured meshes with highly-irregular cell arrangement.
Watanabe, Tadashi
Computers & Fluids, 37(2), p.91 - 98, 2008/02
Times Cited Count：20 Percentile：59.86(Computer Science, Interdisciplinary Applications)In order to develop numerical techniques for two-phase flow simulations, a code solving the Navie-Stokes equations using the level set method is developed and three-dimensional oscillations and rotations of a free liquid droplet are simulated. The oscillations of order 2, 3 and 4 are simulated, and the frequency and the damping for small-amplitude oscillations are shown to agree well with those by the linear theory. Flow fields are visualized, and three-dimensional vortex structures are found to appear around the droplet. It is also found that the number of vortices is the same as the order of oscillation. The effects of initial amplitude and rotation on the oscillation frequency are studied, and it is shown that the oscillation frequency decreases as the initial amplitude increases, while it increases as the rotation rate increases. These nonlinear effects are found to be overestimated by theoretical predictions based on second order perturbations.
Watanabe, Tadashi
Computers & Fluids, 35(10), p.1169 - 1176, 2006/12
Times Cited Count：0 Percentile：0.01(Computer Science, Interdisciplinary Applications)no abstracts in English
