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(噴流の下流圧と噴出口縦横比の影響)
飯尾 昭一郎, 武井 裕紀, 渡辺 あかり
セッションID: K026
発行日: 2020年
公開日: 2020/11/25
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藤澤 延行
セッションID: K031
発行日: 2020年
公開日: 2020/11/25
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安藤 映志, 杉本 康弘, 佐藤 恵一
セッションID: K033
発行日: 2020年
公開日: 2020/11/25
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大内 理功, 木綿 隆弘, 河野 孝昭, 梶谷 尚希, 寺本 裕志
セッションID: K034
発行日: 2020年
公開日: 2020/11/25
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長瀬 諒平, 木綿 隆弘, 河野 孝昭, 上野 敏幸
セッションID: K035
発行日: 2020年
公開日: 2020/11/25
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水野 智太, 松原 雅春
セッションID: L011
発行日: 2020年
公開日: 2020/11/25
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藤平 晃太朗, 西田 均, 山本 久嗣, 百生 登, 上堀 博之
セッションID: L012
発行日: 2020年
公開日: 2020/11/25
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木下 豊章, 西田 均, 山本 久嗣, 百生 登, 橋本 安弘
セッションID: L013
発行日: 2020年
公開日: 2020/11/25
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八友 大知, 杉原 幸信, 高橋 勉
セッションID: L014
発行日: 2020年
公開日: 2020/11/25
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北川 雄太, 太田 貴士
セッションID: L015
発行日: 2020年
公開日: 2020/11/25
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田中 大誠, 太田 貴士
セッションID: L016
発行日: 2020年
公開日: 2020/11/25
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We performed direct numerical simulations of turbulent flow of solidifying liquid near a wall using the phase-field modelling in order to investigate the features of solidification structures. The solidification structures grew under the suppercooling condition with the influence of turbulent flow. As a result of the simulations, it was found that the structures aligned in the streamwise and spanwise directions, and the structure elements had a bent shape. The features of the elements in the solidification structures could change depending on the condition of turbulent flow such as the streamwise velocity. On the other hand, the fluctuation intensity of turbulence determined the characteristics of the distribution of the elements. According to the present results, we expect that turbulent flow affects the distribution of the residual stress inside solidified materials which is caused by the solidification structures.
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牛田 晃臣, 小浦方 格, 中本 義範, 鳴海 敬倫, 佐藤 大祐, 長谷川 富市
セッションID: L022
発行日: 2020年
公開日: 2020/11/25
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Because of investigating effect of washing time for ultra-fine bubble (UFB) mixtures in a laundry cleaning, we measured relationship between washing rate and washing time of water, surfactant solutions, and their UFB mixtures in an alternating flow. Compared with water alone and anionic surfactant solution alone, higher washing rate of a mixed UFB water and anionic surfactant solution was obtained. However, washing rate of nonionic and cationic surfactant solution agreed with that of their UFB mixtures. For discussing the experimental results, we measured dynamic surface tension. Furthermore, relationship between washing effect and wettability was discussed.
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新井 亮汰, 斎藤 啓太, 高橋 勉, 大沼 隼志, 伊藤 雅利
セッションID: L023
発行日: 2020年
公開日: 2020/11/25
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生天目 修弥, 佐藤 大祐, 鳴海 敬倫, 牛田 晃臣
セッションID: L024
発行日: 2020年
公開日: 2020/11/25
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千葉 瞭介, 牛田 晃臣, 佐藤 大祐, 高橋 勉, 斎藤 啓太, 鳴海 敬倫
セッションID: L025
発行日: 2020年
公開日: 2020/11/25
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In this study, phase difference of rod-like micelle surfactant solutions passing through a rectangular channel with a slit section was observed because flow-induced structure of surfactant solutions with counter-ions was investigated in abrupt contraction and expansion flows. Anomalous profiles of phase difference were measured before a slit section and the characteristic retadations were obtained in the specfic molar concentration;
Cs = 1.0 × 10
−1 mol/L. Moreover, this anomalous phenomena were depandance of types of surfactant. For deeply understanding the experimental results, we discussed spatial restraint degree (number of micelles per unit volume). It found that above phenomena were caused at spatial restraint degree ≈ 1.0×10
−5 mol.
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佐藤 大祐, 山田 隼也, 牛田 晃臣, 高橋 勉, 斎藤 啓太, 鳴海 敬倫
セッションID: L026
発行日: 2020年
公開日: 2020/11/25
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時澤 拓也, 勝身 俊之, 門脇 敏
セッションID: M011
発行日: 2020年
公開日: 2020/11/25
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小林 光志, 門脇 敏, 勝身 俊之
セッションID: M012
発行日: 2020年
公開日: 2020/11/25
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中川 燎, 渡邊 和来, 勝身 俊之, 門脇 敏
セッションID: M013
発行日: 2020年
公開日: 2020/11/25
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遠藤 佑太朗, 片山 諒, 津村 達也, 松原 雅春
セッションID: M014
発行日: 2020年
公開日: 2020/11/25
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津村 達也, Sattaya Yimprasert, 松原 雅春
セッションID: M015
発行日: 2020年
公開日: 2020/11/25
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坂村 芳孝, 中山 勝之, 大嶋 元啓, 後藤 啓太
セッションID: M016
発行日: 2020年
公開日: 2020/11/25
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We performed a numerical simulation of the shock-induced motion of a cuboidal rigid body. In the simulation, a body-fitted grid associated with the moving rigid body was overlapped with a Cartesian grid fixed in space, and the transient inviscid flow around the rigid body was simulated coupled with the 6-degrees-of-freedom motion of the rigid body by using the numerical solvers implemented in OpenFOAM v1712. The results for the translational and angular displacements of the rigid body were compared with those obtained from a shock-tube experiment, in which the shockinduced motion of a cuboidal solid body floating in air and the flow field around the moving body were visualized using the shadowgraph technique. The good agreement found between the numerical and experimental results proved the validity of the present simulation.
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瀧澤 友宏, 山縣 貴幸, 藤澤 延行, 稲田 文夫
セッションID: M021
発行日: 2020年
公開日: 2020/11/25
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丸山 秋日呼, 五十嵐 裕也, 藤澤 延行, 山縣 貴幸
セッションID: M022
発行日: 2020年
公開日: 2020/11/25
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佐藤 範一, 藤澤 延行, 山縣 貴幸
セッションID: M023
発行日: 2020年
公開日: 2020/11/25
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(特に崩壊圧力波の効果)
大田 紘夢, 杉本 康弘, 佐藤 恵一
セッションID: M024
発行日: 2020年
公開日: 2020/11/25
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橋本 啓司, 杉本 康弘, 佐藤 恵一
セッションID: M025
発行日: 2020年
公開日: 2020/11/25
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大井 翼, 木村 繁男, 小松 信義, 木綿 隆弘, 河野 孝昭
セッションID: M026
発行日: 2020年
公開日: 2020/11/25
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山内 颯太, 清水 智史, 松原 雅春
セッションID: M031
発行日: 2020年
公開日: 2020/11/25
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宮越 匠, 伊藤 益瑠, 伊藤 竜也, 松原 雅春
セッションID: M032
発行日: 2020年
公開日: 2020/11/25
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清水 智史, 山内 颯太, 松原 雅春
セッションID: M033
発行日: 2020年
公開日: 2020/11/25
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古市 勇斗, 清家 美帆, 中川 慎二, 畠山 友行
セッションID: M034
発行日: 2020年
公開日: 2020/11/25
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We investigated the thermal fume behavior in 1/15 scale model tunnel. For the safety, we used the heat-gun. The tunnel equipment was inclined longitudinally for modeling the inclination. We compared with the thermal fume behavior between the cases of with and no inclination.
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仲田 翔太, 高橋 勉
セッションID: M035
発行日: 2020年
公開日: 2020/11/25
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神山 昂大, 山﨑 渉
セッションID: N011
発行日: 2020年
公開日: 2020/11/25
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宮﨑 紗弥香, 佐々木 大輔
セッションID: N012
発行日: 2020年
公開日: 2020/11/25
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Recently spaceplane has been researched and developed all over the world because they have some advantage for world environment and economy. But they have many aerodynamics problems in development. One of them is shock-shock interaction. These problems may cause serious incidents because the shock wave is known to affect aerodynamics heating and flight performance. Shock wave occur during supersonic flight. Thus, in this research, a cylinder model in used to, analyze detachment shock wave by Cartesian grid.Computationalresult is compared with the experimental data about standoff distance. Through the computations, the accuracy of Cartesian-mesh CFD for supersonic was validated. As a result, it was confirmed that the computational result almost coincided with the experimental data.
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水野 裕太, 佐々木 大輔, 高橋 俊
セッションID: N013
発行日: 2020年
公開日: 2020/11/25
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It is necessary for space exploration to know the origin of earth life and future of our life. Many probes have been sent in space. It will be considered that Mars is one of planets which we inhabit. However, there are a lot of things not to be clear. Currently, it is proposed that a probe flying on Mars is a new approach to explore there. This proposal has ever realized and has many challenges. In particularly, wings are one of essential subject of research. It is possible for Mars aircraft to employ wings composed flexible films, which enables automatical deformation in flight. In this study, a cylinder is a research target to validate the computational accuracy of small deformation. The results showed that present Cartesian-mesh CFD can appropriately compute the small deformation.
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長沼 龍太, 佐々木 大輔, 高橋 俊
セッションID: N014
発行日: 2020年
公開日: 2020/11/25
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人見 優成, 山﨑 渉, 高橋 俊
セッションID: N015
発行日: 2020年
公開日: 2020/11/25
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岸井 辰実, 松島 紀佐
セッションID: N021
発行日: 2020年
公開日: 2020/11/25
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We have been conducting research on improving the robustness and applicability of an inverse problem design method based on Takanashi’s integral-differential formulation. The inverse problem design method is an efficient method. We have started research for practical application of this method and further efficiency of aircraft design. As a way to improve efficiency, we devised a method for designing the aircraft wing more efficiently. In this report, taking NASA-CRM as an example, an approach to improving the efficiency of wing design is described.
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高橋 良尚, 水上 祥, 松島 紀佐, 佐々木 大輔, 鹿田 侑右
セッションID: N022
発行日: 2020年
公開日: 2020/11/25
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水上 祥, 高橋 良尚, 松島 紀佐
セッションID: N023
発行日: 2020年
公開日: 2020/11/25
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夏目 雄太, 鹿田 侑右, 佐々木 大輔, 高橋 良尚, 松島 紀佐
セッションID: N024
発行日: 2020年
公開日: 2020/11/25
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In the field of computational fluid dynamics, wake integration method has the advantage that can reduce non- physical drag effect by numerical viscosity. However, in order to define its appropriate integration region, visualization of physical quantities and quantitative evaluation are required. In this study, we propose CNN (Convolutional Neural Network) model to simplify the definition of the appropriate region. Data sets were created by computing 2D fluid analysis on 15 types of NACA airfoil and learning data were classified into three groups to compare the airfoil shapes contributing to generalization performance. The drag of the surface integral method was used as the training data and the entropy drag visualization image was used as input to learn and infer with the CNN model, and the drag distribution was predicted. As a result, the prediction error of the drag distribution was 1.19 (%) and it was clarified that the presence of a symmetric wing contributes to the generalization performance of the model.
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五十嵐 允, プラムディタ ジョナス, 岡田 和也, 伊藤 雅人, 穂刈 一樹, 田邊 裕治
セッションID: N025
発行日: 2020年
公開日: 2020/11/25
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小林 俊輝, 今井 伸哉, 山﨑 渉
セッションID: N031
発行日: 2020年
公開日: 2020/11/25
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今井 伸哉, 伴 直彦, 山崎 渉
セッションID: N032
発行日: 2020年
公開日: 2020/11/25
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The relationship between optimized blade airfoil shape and effect of flow interaction between blade airfoils is studied on a small, straight Darrieus type vertical axis wind turbine (VAWT). To compare Pareto optimal blade airfoil shapes, a multi-objective shape optimization is performed using a surrogate model-based global optimization approach. The objective functions are the performance of VAWT at one and three blade(s) conditions. These conditions correspond to the cases with and without the flow interaction effect between blade airfoils. The performance is evaluated by 2D unsteady incompressible computational fluid dynamics simulations using ANSYS Fluent. The Pareto optimal airfoil shape at the one blade condition has a thin trailing edge while that at the three blades condition has a thicker airfoil with a rounded outer surface. The rounded airfoil reduces the performance due to spoil higher pressure on outer surface. On the other hand, it also reduces the effect of the wake. It leads to the improvement in the performance with other blade airfoils and the rounded airfoil has best performance as a whole rotor.
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大滝 大樹, 野中 尋史, 山田 昇
セッションID: N033
発行日: 2020年
公開日: 2020/11/25
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青木 崇, 倉橋 貴彦, 片峯 英次
セッションID: N034
発行日: 2020年
公開日: 2020/11/25
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In this study, we present a shape identification analysis about the cooling efficiency of a heater based on the adjoint variable and the finite element methods. The purpose of this study is to obtain an identified shape so as to approach the target radiation amount of the arbitrary boundary in the target shape. Also, the shape gradient for this identification problem is derived by the first variation of the Lagrange function. Reshaping is accomplished using a traction method that is proposed as a solution to the domain optimization problems. The traction method is an algorithm for non-parametric shape optimization problems, and the smooth shape can be obtained by using this method. Based on these considerations, we have constructed a program code for shape identification analysis in thermal convection field. FreeFem++ was used to calculate the identified shape.
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笹岡 修太, 尾関 優汰, 倉橋 貴彦, 小林 正成
セッションID: N035
発行日: 2020年
公開日: 2020/11/25
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In this study, we present the shape optimization of texture applied to the friction surface under hydrodynamic lubrication in order to minimize friction coefficient. Reynolds equation is employed as the governing equation and the gradient with respected to oil film thickness is obtained using adjoint variable method. The gradient is smoothed by traction method and added to original oil film thickness by multiplying step length α. Performance function is defined by frictional force and friction coefficient is decreased by keeping a constant load. A new calculation is added to adjust the basic oil film thickness in order to keep a constant load.
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岡田 将人, 吉田 清斗, 三浦 拓也, 大津 雅亮
セッションID: O011
発行日: 2020年
公開日: 2020/11/25
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石橋 拓人, 森本 喜隆, 林 晃生
セッションID: O012
発行日: 2020年
公開日: 2020/11/25
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When cutting metal workpiece with a machine tool, vibration of the machine may cause an adverse effect on machining accuracy and productivity. As a countermeasure against vibration by designing a machine tool, there is a method to change the machine rigidity by increasing the size and weight of the machine. However, using a moderate machine tool considering the size of the product leads to improve productivity from point of saving space. There is a need for a method of avoiding machine tool vibration by means other than increasing rigidity. Vibrations that adversely affect machining can be roughly classified into forced vibrations and self-excited vibrations. In this study, methods to predict and avoid regenerative chatter vibration, one of the self-excited vibrations, are discussed. The conditions under the regenerative chatter vibration occurring in cutting by an end mill are determined by the mode resonance frequency near the tool of the machine tool and the spindle speed. The effects of machine tool rigidity and mode eigenvalue on chatter vibration are clarified, and verified from experiments and simulations of vibration during machining to be avoided by changing the machine rigidity.
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