Kensuke Yokoi

Kensuke Yokoi
Cardiff University | CU · School of Engineering

PhD

About

43
Publications
6,762
Reads
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955
Citations
Additional affiliations
January 2010 - present
Cardiff University
Position
  • Lecturer
July 2009 - December 2009
University of California, Santa Barbara
Position
  • Research Assistant
October 2007 - June 2009
University of Cambridge
Position
  • Research Associate

Publications

Publications (43)
Article
Full-text available
We numerically investigated liquid droplet impact behavior onto a dry and flat surface. The numerical method consists of a coupled level set and volume-of-fluid framework, volume/surface integrated average based multimoment method, and a continuum surface force model. The numerical simulation reproduces the experimentally observed droplet behavior...
Article
Full-text available
In this paper, we improve the multi-dimensional THINC (tangent of hyperbola for interface capturing) scheme [F. Xiao, Y. Honma, T. Kono, A simple algebraic interface capturing scheme using hyperbolic tangent function, Int. J. Numer. Meth. Fluid. 48 (2005) 1023]. The THINC scheme is a VOF (volume of fluid) type method. In the original THINC scheme,...
Article
Full-text available
We numerically investigate water droplet splashing on a dry, flat and smooth surface. Our numerical framework can reproduce a prompt splash with satellite droplets and spikes at least qualitatively. The numerical results have shown that the dynamic contact angle can trigger a prompt splash without the roughness of a solid surface. We also propose a...
Article
Full-text available
We propose a practical numerical framework for free surface flows with surface tension force. The numerical framework consists of the CLSVOF (coupled level set and volume-of-fluid) method, the THINC/WLIC (tangent of hyperbola for interface capturing/weighted line interface calculation) scheme, multi-moment methods (CIP-CSL and VSIAM3) and the densi...
Article
Full-text available
We propose an efficient multidimensional implementation of VSIAM3 (volume/surface integrated average-based multi-moment method). Although VSIAM3 is a highly capable fluid solver based on a multi-moment concept and has been used for a wide variety of fluid problems, VSIAM3 could not simulate some simple benchmark problems well (for instance, lid-dri...
Article
Full-text available
Motivated by the enlightenment that diminishing the jump at the cell boundary can effectively reduce numerical dissi-pation near the critical region, a novel constrained interpolation profile conservative semi-Lagrangian method is proposed based on a newly designed boundary variation diminishing (BVD) algorithm. Firstly, a constrained interpolation...
Article
Full-text available
First, a new reconstruction strategy is proposed to improve the accuracy of the fifth-order weighted essentially non-oscillatory (WENO) scheme. It has been noted that conventional WENO schemes still suffer from excessive numerical dissipation near-critical regions. One of the reasons is that they tend to under-use all adjacent smooth substencils th...
Article
Application of numerical simulations are desired to improve the quality of powder products and to optimize the production process in powder die-filling. In the powder die-filling, complex gas-solid interaction should be simulated since solid particles are significantly influenced by gas flow under moving wall boundary. The discrete element method (...
Article
Full-text available
In this Letter, we study the splashing behavior of droplets upon impact onto a variety of substrates with different wetting properties, ranging from hydrophilic to superhydrophobic surfaces. In particular, we study the effects of the dynamic contact angle on splashing. The experimental approach uses high-speed imaging and image analysis to recover...
Article
Full-text available
In this work we propose a new formulation for high-order multi-moment constrained finite volume (MCV) method. In the one-dimensional building-block scheme, three local degrees of freedom (DOFs) are equidistantly defined within a grid cell. Two candidate polynomials for spatial reconstruction of third-order are built by adopting one additional const...
Article
Full-text available
We propose a fully conservative and less oscillatory multi-moment scheme for the approximation of hyperbolic conservation laws. The proposed scheme (CIP-CSL3ENO) is based on two CIP-CSL3 schemes and the essentially non-oscillatory (ENO) scheme. In this paper, we also propose an ENO indicator for the multimoment framework, which intentionally select...
Article
Full-text available
We investigated discretization strategies of the conservation equation in volume/surface integrated average-based multi-moment method (VSIAM3) which is a numerical framework for incompressible and compressible flows based on a multi-moment concept. We investigated these strategies through the lid-driven cavity flow problem, shock tube problems, 2D...
Article
We propose a fully conservative high-order upwind multi-moment method for the conservation equation. The proposed method is based on a third-order polynomial interpolation function and semi-Lagrangian formulation and is a variant of the constrained interpolation profile conservative semi-Lagrangian scheme with third-order polynomial function method...
Article
We examine the recently-proposed density-scaled balanced continuum surface force (CSF) model with a level set-based curvature interpolation technique. The density-scaled balanced CSF model is combined with a numerical framework which is based on the coupled level set and volume-of-fluid (CLSVOF) method, the tangent of hyperbola for interface captur...
Article
Full-text available
We propose a numerical framework which can simulate free surface flows with complex moving interfaces like droplet splashing as minimizing spurious currents. The numerical framework is based on the CLSVOF (coupled level set and volume-of-fluid) method, the THINC/WLIC (tangent of hyperbola for interface capturing/weighted line interface calculation)...
Article
Full-text available
We propose a numerical method for handling interaction among multiple particles, fluid and structure of arbitrary shape. The method is based on the level set method, the DEM (discrete element method), the CIP (Cubic Interpolated Propagation) method and the ghost fluid method. In this formulation, interfaces of particles, liquid and structures are r...
Article
We numerically studied splashes on dry surfaces in terms of dynamic contact angle. Our simulation model based on CLSVOF (Coupled level set and Volume-of-Fluid) method, CIP (constraint interpolation profile) method and VISAM3 (Volume/Surface Integrated Average based Multi-Moment Method) has capability to simulate splashes in droplet impact onto flat...
Article
We propose a simple and robust numerical algorithm to deal with multi-phase motion of gas, liquid and solid based on the level set method [S. Osher, J.A. Sethian, Front propagating with curvature-dependent speed: Algorithms based on Hamilton–Jacobi formulation, J. Comput. Phys. 79 (1988) 12; M. Sussman, P. Smereka, S. Osher, A level set approach fo...
Article
Full-text available
We propose a simple and practical numerical method for free surface flows. The method is based various methods, the level set method of an interface capturing method, the THINC/WLIC (tangent of hyperbola for interface capturing/weighed line interface calculation) method of an interface tracking method, the CIP-CSL (constrained interpolation profile...
Article
We present numerical results of droplet impacts on heterogeneous substrate as well as homogeneous substrates. The numerical method is based on the level set method, the THINC/WLIC method (a VOF type method), the CIP-CSL method and the CSF model. We compare the numerical results with experiments. The numerical results show good agreements with the e...
Article
We propose a numerical method for dealing with interactions among fluid, multiple particles and complex structures. This method is based on the level set method, the CIP method and DEM. In the formulation, the structures are represented on a grid by using the level set method. The interactions of particles and structures are calculated by a method...
Article
We propose a numerical method for dealing with interactions between multiple particles and complex structures. In the method, the structures are represented on a grid by using the level set method. The interactions of particles and structures are calculated by a method based on the discrete element method. The method can treat the interaction betwe...
Article
Full-text available
We propose a numerical algorithm to compute flows in a complex geometry such as a blood vessel. The algorithm is based on the level set method, the fractional step method, the CIP method and the ghost fluid method in a regular Cartesian grid. The algorithm was applied to various test problems to verify the reliability of method, and numerical resul...
Article
We analysed fluid dynamics at brain arteries having multiple inflow and out flow like Willis ring based on clinical imaging modalities. In addition, we analysed fluid dynamics with therapeutic devices like coils and stents to simulate their influences to blood flow. 3D CTA and MRA obtained three-dimensional structures of the brain vessels. The cent...
Article
We propose a numerical method for blood flows in the complex vessel. The method is based on the fractional step method, the CIP method, the level set method and the ghost fluid method. We applied the method to blood flows in cerebral artery with five aneurysms.
Article
We propose a numerical method for blood flows in the complex vessel. The method is based on the fractional step method, the CIP method, the level set method and the ghost fluid method. We applied the method to blood flows in cerebral artery with five aneurysms.
Article
We propose a numerical method for dealing with a moving solid body that interacts with a complex liquid surface. The method is based on the level set method, the CIP method, and the ghost fluid method. The validity of the method was shown by applying it to Poiseuille and Couette flow problems. The method can precisely capture the boundary layer as...
Article
We propose a numerical method to capture and track complex moving boundaries advected in flows. Our method is based on the level set method, but it overcomes the the problem of accumulation of re-initialization error in the level set method. The method can capture the shape of the solid body well.
Article
We propose a numerical method to capture and track complex moving boundaries advected in flows. Our method is based on the level set method, but it overcomes the problem of accumulation of reinitialization error in the level set method.
Article
We studied numerically circular hydraulic jumps of moderate Reynolds number to clarify the structure formation in circular hydraulic jumps. The numerical model has been constructed based on the CIP–CUP (cubic interpolated propagation–combined unified procedure) method, the level set method and the CSF (continuum surface force) model. The model can...
Article
A computational model for interfacial flows including the effect of surface tension force has been constructed based on the C-CUP (Cubic interpolated propagation, Combined Unified Procedure) method, the level set method and the CSF (Continuum Surface Force) model. The computational model can simulate largely deformed interfaces as those found in hy...
Article
Full-text available
We investigated numerically the relation between a roller and the pressure distribution to clarify the dynamics of the roller in circular hydraulic jumps. We found that a roller which characterizes a type II jump is associated with two high pressure regions after the jump, while a type I jump (without the roller) is associated with only one high pr...
Article
We performed axisymmetric (r-z) simulations to clarify the structure formation of the circular hydraulic jump. The transition from a type I to a type II jump, which was induced by changing the depth of the fluid far away from the jet in the laboratory experiment, was investigated numerically. We found that the transition is associated with a rise i...
Article
Full-text available
A prototype, multi-scale, computational hemodynamic model is presented. Applications to aortic arch, carotid artery, renal artery and so forth, has demonstrated its feasibility in medical applications of the computation-based diagnosis and surgery; and with this novel multi-scale computational method in hemodynamics the noninvasive simulation of ca...
Article
Full-text available
この論文は国立情報学研究所の電子図書館事業により電子化されました。 研究会報告
Article
Full-text available
この論文は国立情報学研究所の電子図書館事業により電子化されました。 日常世界において流体現象は,河川,キッチン(コンロ,流し,やかんの水,など),動植物内等いたる所に現れる.これらのような流体現象の多くは,移動境界(気-液,固-液,液-液,など)を持ち,それらの境界は一般に複雑であったり,大きく変形したりする.このような現象の解析はチャレンジングかつ実用的にも重要であるが,物理的対象としては複雑すぎ,研究する手段も近年まで実験以外にはなかった.しかし,近年の数値流体の計算法の発展により,これらの現象の数値的扱いが可能になりはじめ,計算物理の対象になりつつある.本原稿では,自由界面流れを例に近年開発された移動境界流れの計算手法について紹介する.

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Projects

Project (1)
Project
Modeling of multiphase flows based on multi-moment methods (CIP-CSL, VSIAM3, etc.), CSLVOF method (level set, VOF and THINC methods ), CSF (continuum surface force) model, etc.