Toward high-fidelity modeling of the fluid-structure interaction for insect wings

2012 ◽  
Author(s):  
Haoxiang Luo ◽  
Hu Dai ◽  
Shahrizan Syawal Das ◽  
Jialei Song ◽  
James Doyle
Keyword(s):  
Fluid Structure Interaction ◽  
High Fidelity ◽  
Fluid Structure ◽  
Structure Interaction ◽  
Insect Wings

Composed Fluid–Structure Interaction Interface for Horizontal Axis Wind Turbine Rotor

2015 ◽  
Vol 10 (4) ◽  
Author(s):  
Dubravko Matijašević ◽  
Zdravko Terze ◽  
Milan Vrdoljak
Keyword(s):  
Wind Turbine ◽  
Numerical Models ◽  
Stress Test ◽  
Fluid Structure Interaction ◽  
Horizontal Axis ◽  
High Fidelity ◽  
Horizontal Axis Wind Turbine ◽  
Recovery Method ◽  
Fluid Structure ◽  
Structure Interaction

In this paper, we propose a technique for high-fidelity fluid–structure interaction (FSI) spatial interface reconstruction of a horizontal axis wind turbine (HAWT) rotor model composed of an elastic blade mounted on a rigid hub. The technique is aimed at enabling re-usage of existing blade finite element method (FEM) models, now with high-fidelity fluid subdomain methods relying on boundary-fitted mesh. The technique is based on the partition of unity (PU) method and it enables fluid subdomain FSI interface mesh of different components to be smoothly connected. In this paper, we use it to connect a beam FEM model to a rigid body, but the proposed technique is by no means restricted to any specific choice of numerical models for the structure components or methods of their surface recoveries. To stress-test robustness of the connection technique, we recover elastic blade surface from collinear mesh and remark on repercussions of such a choice. For the HAWT blade recovery method itself, we use generalized Hermite radial basis function interpolation (GHRBFI) which utilizes the interpolation of small rotations in addition to displacement data. Finally, for the composed structure we discuss consistent and conservative approaches to FSI spatial interface formulations.

scholarly journals Reduced-Order Modeling and the Physics Governing Flapping Wing Fluid-Structure Interaction

2021 ◽  
Author(s):  
Erick Johnson ◽  
Ryan Schwab ◽  
Mark Jankauski
Keyword(s):  
Fluid Structure Interaction ◽  
Flapping Wing ◽  
Analytical Models ◽  
High Fidelity ◽  
Element Analysis ◽  
Fluid Structure ◽  
Reduced Order ◽  
Assumed Mode Method ◽  
Structure Interaction ◽  
Fea Model

Flapping, flexible insect wings deform during flight from aerodynamic and inertial forces. This deformation is believed to enhance aerodynamic and energetic performance. However, the predictive models used to describe flapping wing fluid-structure interaction (FSI) often rely on high fidelity computational solvers such as computational fluid dynamics (CFD) and finite element analysis (FEA). Such models require lengthy solution times and may obscure the physical insights available to analytical models. In this work, we develop a reduced order model (ROM) of a wing experiencing single-degree-of-freedom flapping. The ROM is based on deformable blade element theory and the assumed mode method. We compare the ROM to a high-fidelity CFD/FEA model and a simple experiment comprised of a mechanical flapper actuating a paper wing. Across a range of flapping-to-natural frequency ratios relevant to flying insects, the ROM predicts wingtip deflection five orders of magnitude faster than the CFD/FEA model. Both models are resolved to predict wingtip deflection within 30% of experimentally measured values. The ROM is then used to identify how the physical forces acting on the wing scale relative to one another. We show that, in addition to inertial and aerodynamic forces, added mass and aerodynamic damping influence wing deformation nontrivially.

Fast high fidelity CFD/CSM fluid structure interaction using RBF mesh morphing and modal superposition method

2019 ◽  
Vol 91 (6) ◽  
pp. 893-904 ◽  
Author(s):  
Corrado Groth ◽  
Ubaldo Cella ◽  
Emiliano Costa ◽  
Marco Evangelos Biancolini
Keyword(s):  
Fluid Structure Interaction ◽  
Superposition Method ◽  
High Fidelity ◽  
Modal Shape ◽  
Fluid Structure ◽  
Content Type ◽  
Mesh Morphing ◽  
Structure Interaction ◽  
Engineering Models ◽  
Computational Structural Mechanics

Purpose This paper aims to present a fast and effective approach to tackle complex fluid structure interaction problems that are relevant for the aeronautical design. Design/methodology/approach High fidelity computer-aided engineering models (computational fluid dynamics [CFD] and computational structural mechanics) are coupled by embedding modal shapes into the CFD solver using RBF mesh morphing. Findings The theoretical framework is first explained and its use is then demonstrated with a review of applications including both steady and unsteady cases. Different flow and structural solvers are considered to showcase the portability of the concept. Practical implications The method is flexible and can be used for the simulation of complex scenarios, including components vibrations induced by external devices, as in the case of flapping wings. Originality/value The computation mesh of the CFD model becomes parametric with respect to the modal shape and, so, capable to self-adapt to the loads exerted by the surrounding fluid both for steady and transient numerical studies.

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