研究者詳細 - 石原　大輔

論文 - 石原　大輔

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A Three-Dimensional Computational Study on the Fluid-Structure Interaction Cause of Wing Pitch Changes in Insect Flapping Flight 査読有り

Daisuke Ishihara,Tomoyoshi Horie,Tomoya Niho

Proceedings of the 9th World Congress on Computational Mechanics and 4th Asian Pacific Congress on Computational Mechanics 27 - 28 2010年07月

Parallel Monolithic Approach for Shell-Fluid Interaction Analysis of Flapping Flexible Wing 招待有り査読有り

Daisuke Ishihara,Tomoyoshi Horie,Tomoya Niho

Proceedings of 4th Korea-Japan COSEIK-JSCES Workshop on Computational Engineering 26 - 27 2010年05月

A study on the passive pitching and lift generation in crane-fly's flight 査読有り

Ishihara D., Yamashita Y., Horie T., Niho T.

Nihon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B ( 社団法人日本機械学会 ) 76 ( 764 ) 601 - 607 2010年04月

担当区分：筆頭著者記述言語：英語掲載種別：研究論文（学術雑誌）

In this study, we evaluated the lift force generated by the crane-fly's flapping wing with the passive pitching using the dynamically scaled model. Since the wing and the surrounding fluid interact with each other, the dynamic similarity between the model and actual crane-fly flights was measured using not only the Reynolds and Strouhal numbers but also the mass and Cauchy numbers. Although there existed the difference between the mass number due to the constant acceleration of the gravity, but the lift coefficient simulated by our model indicated that the flapping wing with the passive pitching produces the enough lift force to support the crane-fly's weight.

DOI： 10.1299/kikaib.76.764_601

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Finite Element Analysis for Coupled Problems of Structure, Fluid and Electrostatic Field in Micro Cantilever Beam 招待有り査読有り

Daisuke Ishihara,Tomoyoshi Horie,Tomoya Niho,Akiyoshi Baba

2nd International Workshops on Advances in Computational Mechanics 1 - 121 2010年03月

Passive maintenance of high angle of attack and its lift generation during flapping translation in crane fly wing 査読有り

Ishihara D., Yamashita Y., Horie T., Yoshida S., Niho T.

Journal of Experimental Biology 212 ( 23 ) 3882 - 3891 2009年12月

担当区分：筆頭著者記述言語：英語掲載種別：研究論文（学術雑誌）

We have studied the passive maintenance of high angle of attack and its lift generation during the crane fly's flapping translation using a dynamically scaled model. Since the wing and the surrounding fluid interact with each other, the dynamic similarity between the model flight and actual insect flight was measured using not only the non-dimensional numbers for the fluid (the Reynolds and Strouhal numbers) but also those for the fluid-structure interaction (the mass and Cauchy numbers). A difference was observed between the mass number of the model and that of the actual insect because of the limitation of available solid materials. However, the dynamic similarity during the flapping translation was not much affected by the mass number since the inertial force during the flapping translation is not dominant because of the small acceleration. In our model flight, a high angle of attack of the wing was maintained passively during the flapping translation and the wing generated sufficient lift force to support the insect weight The mechanism of the maintenance is the equilibrium between the elastic reaction force resulting from the wing torsion and the fluid dynamic pressure. Our model wing rotated quickly at the stroke reversal in spite of the reduced inertial effect of the wing mass compared with that of the actual insect This result could be explained by the added mass from the surrounding fluid. Our results suggest that the pitching motion can be passive in the crane fly's flapping flight.

DOI： 10.1242/jeb.030684

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A two-dimensional computational study on the fluid-structure interaction cause of wing pitch changes in dipteran flapping flight 査読有り

Ishihara D., Horie T., Denda M.

Journal of Experimental Biology 212 ( 1 ) 1 - 10 2009年01月

担当区分：筆頭著者記述言語：英語掲載種別：研究論文（学術雑誌）

In this study, the passive pitching due to wing torsional flexibility and its lift generation in dipteran flight were investigated using (a) the non-linear finite element method for the fluid-structure interaction, which analyzes the precise motions of the passive pitching of the wing interacting with the surrounding fluid flow, (b) the fluid-structure interaction similarity law, which characterizes insect flight, (c) the lumped torsional flexibility model as a simplified dipteran wing, and (d) the analytical wing model, which explains the characteristics of the passive pitching motion in the simulation. Given sinusoidal flapping with a frequency below the natural frequency of the wing torsion, the resulting passive pitching in the steady state, under fluid damping, is approximately sinusoidal with the advanced phase shift. We demonstrate that the generated lift can support the weight of some Diptera.

DOI： 10.1242/jeb.020404

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Incremental formulation of pressure based method for fluid-rigid body interaction using intermediate variable and its verification 査読有り

Ishihara D., Matsumoto J.

Nihon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B 74 ( 12 ) 2419 - 2425 2008年12月

担当区分：筆頭著者記述言語：英語掲載種別：研究論文（学術雑誌）

In this paper, an incremental formulation of pressure based method for fluid-rigid body interaction using intermediate variable is presented. The present method is based on the method proposed by Matsumoto and Kawahara in previous studies. In their method, the pressure Poisson equation equivalent to the incompressibility constraint is derived by using the intermediate fluid velocity and the approximation of enough small error between the intermediate fluid velocity and the fluid velocity. In the present method, all terms appear in the coupled equation system are evaluated in the same time instant, and unknown variables are solved incrementally by iterative solution procedure in each time step so as to satisfy the coupled equation system defined in the time instant. The present formulation is required when structural nonlinearity such as large deformation should be considered. The present method is applied for the free vibration of a rigid circular cylinder in a quiescent fluid to verify its performance.

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Development of strongly coupled method for interaction of structure, incompressible viscous fluid and electrostatic field (1st report, rigid body approximation of structure) 査読有り

Ishihara D., Kubota A., Horie T., Niho T., Yoshimura S.

Nihon Kikai Gakkai Ronbunshu, A Hen/Transactions of the Japan Society of Mechanical Engineers, Part A 74 ( 8 ) 1068 - 1075 2008年08月

担当区分：筆頭著者記述言語：英語掲載種別：研究論文（学術雑誌）

In this paper, a strongly coupled method for interaction of rigid body, incompressible viscous fluid and electrostatic field is developed. The present method is composed of monolithic and partitioned methods. The former solves structure-fluid interaction and the later solves interaction of electrostatic field and the other fields. The difference between the present method and conventional method is the introduction of the iterative solution procedure in the partitioned method. To demonstrate the fundamental performances of the present method, it is applied to simulate a micro membrane actuated by electrostatic force situated in air. The present result agrees well with the theoretical solution when the displacement of the rigid body is small. We also comfirm that the iterative solution procedure makes the present method to be the strongly coupled method through the numerical example.

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Efficient Parallel Analysis of Shell-fluid Interaction Problem by Using Monolithic Method Based on Consistent Pressure Poisson Equation 招待有り査読有り

Daisuke Ishihara,Shigeo Kanei,Shinobu Yoshimura,Tomoyoshi Horie

Journal of Computational Science and Technology 2 ( 1 ) 185 - 196 2008年06月

Efficient parallel analysis of shell-fluid interaction problem by monolithic method based on consistent pressure poisson equation 査読有り

Ishihara D., Kanei S., Yoshimura S., Horie T.

Nihon Kikai Gakkai Ronbunshu, A Hen/Transactions of the Japan Society of Mechanical Engineers, Part A 73 ( 1 ) 34 - 41 2007年01月

担当区分：筆頭著者記述言語：英語掲載種別：研究論文（学術雑誌）

In this paper, a parallel monolithic method for shell-fluid interaction based on the consistent Pressure Poisson Equation (PFE) is developed and its parallel computational efficiency is demonstrated. The previous and present studies show that iterative solvers without preconditioning work well to solve the PPE, even though the coefficient matrix of the original linearized coupled equations becomes to be ill-conditioned. As a consequence, combining with the iterative solvers without preconditioning parallelized based on the mesh decomposition, the developed method can archive efficient parallel computation. To demonstrate the performances of the developed method, it is applied to simulate the vibration of an elastic plate situated in the wake of a rectangular cylinder and a flapping elastic wing in fluid.

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Development of monolithic method for shell-fluid interaction based on consistent pressure poisson equation 査読有り

Ishihara D., Kanei S., Horie T.

Nihon Kikai Gakkai Ronbunshu, A Hen/Transactions of the Japan Society of Mechanical Engineers, Part A 72 ( 4 ) 377 - 384 2006年07月

担当区分：筆頭著者記述言語：英語掲載種別：研究論文（学術雑誌）

This paper describes an efficient monolithic method for shell-fluid interaction problems based on the fluid pressure Poisson equation (PPE). The PPE is derived so as to be consistent with the coupled equation system for the shell-fluid interaction. In the proposed method, the fluid pressure is derived implicitly so as to satisfy the incompressibility. constraint and all the other unknown variables except those for the shell are derived explicitly. The coefficient matrix of the PPE is well-conditioned even if the structure is very stiff or heavy compared to the fluid, and even if the ill-conditioned submatrix is generated due to the shell elements. These characteristics are successfully utilized to combine the proposed method with the standard conjugate gradient method. To demonstrate fundamental perfermances of the proposed method, it is applied to evaluate the vibration characteristics of a thin elastic cantilever plate in a quiescent fluid.

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Fluid-structure interaction modeling of insect flight (1st report, investigation of automatic wing rotation and lift force generation by two-dimensional numerical analysis) 査読有り

Ishihara D., Horie T.

Nihon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B 72 ( 6 ) 1410 - 1417 2006年06月

担当区分：筆頭著者記述言語：英語掲載種別：研究論文（学術雑誌）

In this paper, a novel insect flight model based on fluid-structure interaction is proposed. Incorporating the high compliance of the wing base, which is observed in Diptera, the proposed model can express the automatic control of the wing rotation via fluid-structure interaction and can generate the adequate aerodynamic forces for the insect flight. The fluid-structure interaction is simulated by a monolithic method based on the finite element method. The result given by the proposed model is investigated by comparison with experimental results of the dynamically scaled model of the fruit fly given by Dickinson et al.

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高性能演算サーバーによる並列流体構造連成解析招待有り

石原　大輔

九州大学情報基盤センター広報 6 ( 2 ) 43 - 46 2006年04月

A monolithic approach for interaction of incompressible viscous fluid and an elastic body based on fluid pressure Poisson equation 査読有り

Ishihara D., Yoshimura S.

International Journal for Numerical Methods in Engineering 64 ( 2 ) 167 - 203 2005年09月

担当区分：筆頭著者記述言語：英語掲載種別：研究論文（学術雑誌）

This paper describes a new monolithic approach based on the fluid pressure Poisson equation (PPE) to solve an interaction problem of incompressible viscous fluid and an elastic body. The PPE is derived so as to be consistent with the coupled equation system for the fluid-structure interaction (FSI). Based on this approach, we develop two kinds of efficient monolithic methods. In both methods, the fluid pressure is derived implicitly so as to satisfy the incompressibility constraint, and all other unknown variables are derived fully explicitly or partially explicitly. The coefficient matrix of the PPE for the FSI becomes symmetric and positive definite and its condition is insensitive to inhomogeneity of material properties. The arbitrary Lagrangian-Eulerian (ALE) method is employed for the fluid part in order to take into account the deformable fluid-structure interface, To demonstrate fundamental performances of the proposed approach, the developed two monolithic methods are applied to evaluate the added mass and the added damping of a circular cylinder as well as to simulate the vibration of a rectangular cylinder induced by vortex shedding. Copyright © 2005 John Wiley & Sons, Ltd.

DOI： 10.1002/nme.1348

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Monolithic approach for fluid-structure interaction based on consistent pressure poisson equation 査読有り

Ishihara D., Yoshimura S.

Nihon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B ( 一般社団法人日本機械学会 ) 71 ( 706 ) 1565 - 1572 2005年06月

担当区分：筆頭著者記述言語：英語掲載種別：研究論文（学術雑誌）

This paper describes a new monolithic approach based on the Pressure Poisson Equation (PPE) I to solve interaction problems of incompressible viscous fluid and an'elastic body. The PPE is derived I so as to be consistent with the coupled equation system for the fluid-structure interaction (FSI). Based on this approach, we develop two efficient monolithic methods. In both methods, the fluid pressure is derived implicitly so as to satisfy the incompressibility constraint and all the other unknown variables are derived fully explicitly or partially explicitly. The coefficient matrix of the PPE for the FSI has characteristics of (a) symmetric and positive definite feature, (b) reduction of degrees of freedoms to be solved, and (c) less dependence of the condition on material properties. The arbitrary Lagrangian-Eulerian method is employed for the fluid to take into account the deformable fluid-structure interface. To demonstrate fundamental performances of the proposed approach, the developed two monolithic methods are applied to simulate the vibration of a rectangular cylinder induced by vortex shedding.

DOI： 10.1299/kikaib.71.1565

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A Monolithic Method for Fluid-shell Interaction Based on Consistent Pressure Poisson Equation 査読有り

Daisuke Ishihara,Tomoyoshi Horie

Proceedings of the First International Conference on Computational Methods for Coupled Problems in Science and Engineering (CD-ROM) 2005年05月

Development of strong coupling method considering non-conforming mesh on fluid-structure interface (1st report, verification of method) 査読有り

Ishihara D., Horie T.

Nihon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B ( 一般社団法人日本機械学会 ) 71 ( 705 ) 1346 - 1353 2005年05月

担当区分：筆頭著者記述言語：英語掲載種別：研究論文（学術雑誌）

This paper describes a strong coupling method considering non-conforming mesh on fluid-structure interface. In the present method, a transformation matrix derived from the geometrical relations between non-conforming fluid and structural meshes on fluid-structure interface is directly combined with the formulation of the strong coupling method to satisfy the compatibility and equilibirium conditions on fluid-structure interface. The conjugate gradient method is applied to solve the derived coupled equation system by introducing the consistent pressure Poisson equation. To verify basic characteristics of the proposed method, it is applied for free vibration of a cylinder in quiescent fluid. The added mass and damping coefficients derived by the present method agree well with those by other researchers.

DOI： 10.1299/kikaib.71.1346

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Efficient strong coupling method for fluid-structure interaction based on explicit method for structure and semi-implicit method for fluid 査読有り

Ishihara D.

Nihon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B ( 一般社団法人日本機械学会 ) 70 ( 700 ) 3098 - 3105 2004年12月

担当区分：筆頭著者記述言語：英語掲載種別：研究論文（学術雑誌）

This paper describes an efficient strong coupling method for fluid-structure interaction based on the explicit method for structure and the semi-implicit method for fluid. The solution process of fluid-structure interation system is divided into that of fluid and structure, which is independent to each other except data transfer of the fluid-structure interface. Some existing codes with small modification can be utilized to realize the above two solution processes. Note that the time increment is restricted by the Courant's and diffusive number conditions. The method is applied to solve a loaded cantilever in a flow channel under some conditions. Through the numerical results, characteristics of the method are compared to those of a strong coupling and a weak coupling method.

DOI： 10.1299/kikaib.70.3098

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オブジェクト指向に基づく構造設計用統合化CAEシステムとマイクロマシン構造設計への適用査読有り

吉村忍,石原大輔

日本設計工学会論文集 39 ( 11 ) 584 - 593 2004年11月

マイクロマシンの計算力学シミュレーション査読有り

吉村忍,石原大輔

機械の研究 55 ( 11 ) 1109 - 1118 2003年11月

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