Simulation of Fluid-Structure Interaction based on an Immersed-Solid Method

Takeo Kajishima and Shintaro Takeuchi, "Simulation of Fluid-Structure Interaction based on an Immersed-Solid Method", Journal of Mechanical Engineering and Sciences, Vol. 5, pp.555-561, UMP, 201

Unisexual and bisexual types of ginbuna, Carassius auratus langsdorfii in Aichi Prefecture

Article信州大学理学部紀要 19(1): 1-7(1984)departmental bulletin pape

Effect of temperature gradient within a solid particle on the rotation and oscillation modes in solid-dispersed two-phase flows

Shintaro Takeuchi, Takaaki Tsutsumi and Takeo Kajishima, "Effect of temperature gradient within a solid particle on the rotation and oscillation modes in solid-dispersed two-phase flows," International Journal of Heat and Fluid Flow, Vol.43, pp.15-25, 2013.動画は論文出版後に追加したものである。 / The video was added after the paper was published

Heat transfer and particle behaviours in dispersed two-phase flow with different heat conductivities for liquid and solid

Tsutsumi, T et al. Flow Turbulence Combust (2014) 92: 103. doi:10.1007/s10494-013-9498-0The final publication is available at Springer via http://dx.doi.org/10.1007/s10494-013-9498-0

Generality of rotating partial cavitation in two-dimensional cascades

Numerical simulations of 2-dimensional (2D) unsteady cavitating flows were carried out under various conditions of the number of blades, incidence angles and cavitation numbers. When the incidence angle increased or the cavitation number decreased, the steady balanced cavitation transited to unsteady and non-uniform patterns. Typical patterns reported in the previous studies such as rotating, asymmetric and alternating for 3- and 4-blades were successfully reproduced. In this study, cascades of the larger number of blades were dealt with to consider the generality of unsteadiness by reducing the influence of periodicity. The cavitation is basically triggered in the backward next section. However, the period of time for growing causes complexity in the discrimination of propagation. In most cases of rotating partial cavitation, except for 4-blades, the cavity develops in the second passage of backward direction after the decay of largest cavity. In case of many blades, multiple cavities rotate simultaneously and the particular patterns observed in cascades of small even numbers of blades attenuate.http://deepblue.lib.umich.edu/bitstream/2027.42/84276/1/CAV2009-final90.pd

Role of Vortical Structures on the Forced Convective Heat Transfer in Oscillation-Controlled Coaxial-Pipe Heat Exchanger

A numerical simulation of an oscillation-controlled heat-transport coaxial pipe is carried out for studying the flow structure and heat transport characteristics. The heat-transport pipe connects the hot and cold reservoirs, and the cold and hot fluids are discharged with the anti-phase reciprocal waves through circular and annular openings at the ends of the chamber, respectively. By changing the diameter ratio of the circular opening to the inner tube, a unidirectionally circulating flow is observed to develop spontaneously. The flow rate of the unidirectional current is found to be approximately inversely-proportional to the diameter ratio. While the amount of transported heat increases with the flow rate of the unidirectional current (especially when generating strong vortices at the edge of the inner tube) for both cases of thermally-insulated and fully-conductive inner wall, the optimal heat transport performance is attained (not in association with the strongest unidirectional flow) when making zero-averaged vorticity in the cold-end region. For the case of the conductive inner wall, the heat loss across the wall is suppressed with decreasing the diameter ratio, due to the development of the strong jet and radially surrounding shear layer that separate the outer hot fluid from the inner cold fluid.This is a pre-copyedited, author-produced PDF of an article accepted for publication in Journal of Enhanced Heat Transfer following peer review

A conservative momentum exchange algorithm for interaction problem between fluid and deformable particles

This is the peer reviewed version of the following article:Shintaro Takeuchi, Yoshihiko Yuki, Atsushi Ueyama, Takeo Kajishima, "A conservative momentum exchange algorithm for interaction problem between fluid and deformable particles," International Journal for Numerical Methods in Fluids, Vol.64, Issue 10-12, pp.1084-1101, John Wiley & Sons, 2010, which has been published in final form at http://dx.doi.org/10.1002/fld.2272. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Self-Archiving

Large scale analysis of interactive behaviors of bubbles and particles in a liquid by a coupled immersed boundary and vof technique

A new approach for direct numerical simulation of three-phase (gas-liquid-solid) flows is proposed. Implementation of moving rigid surface in a fluid is based on an immersed boundary/solid-object method method developed by the present authors, and gas-liquid interface is captured by volume-of-fluid (VOF) method with an interface reconstruction scheme. The proposed coupling technique enables simulation of flow structures induced by both bubble and particle of comparable sizes, including the flow pattern around the gas-liquid and solid-liquid interfaces. In a suspension of 1024 solid particles and a bubble, some typical behaviours of bubble-particle interaction and liquid flow pattern are captured. The detailed analysis on the motion of the falling particles suggests that the particle rotation is strongly influenced by the behaviours of the rising bubble, giving rise a snap reversal of the rotating directions of the particles due to the flow induced by the bubble.This is a pre-copyedited, author-produced PDF of an article accepted for publication in Multiphase Science and Technology following peer review