A dynamic mesh strategy applied to the simulation of flapping wings

Deng, Shuanghou; Xiao, Tianhang; Oudheusden, B.W. van; Bijl, H.

doi:10.1002/nme.5160

Cited by 11 publications

(11 citation statements)

References 51 publications

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“…In view of the inherent large flapping motions, an efficient and robust dynamic mesh strategy was required for the flapping motion and the mesh motion caused by the structure deformation. In this paper, a RBF-based deformable overset grid proposed by Deng et al [19] was employed and is roughly addressed here as:…”

Section: Coupling Strategymentioning

confidence: 99%

Numerical investigation on the propulsive performance of flexible flapping fins using CFD/CSD method

Liu¹,

Ang²

2017

J. vibroeng.

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A FSI (fluid-structure interaction) numerical simulation was performed to investigate the flow field around a flexible flapping fin using an in-house developed CFD/CSD solver. The three-dimensional fluid-structure interaction of the flapping locomotion was achieved by loosely coupling preconditioned Unsteady Reynolds-Averaged Navier-Stokes (URANS) solutions and non-linear co-rotational structural solutions. The CSD solver was developed specifically for high flexible flapping fins by considering the large geometric nonlinear characteristics. Validation of benchmark tests illustrated the high-fidelity of the developed methodology. Then effect of flexural angles, flexural amplitude and flapping frequency in terms of Strouhal number were evaluated. Results demonstrated that different flexural angles will present different flow fields, and thus significantly varied thrust generation and pressure distribution. The thrust does not increase monotonically with flexural angles. The thrust is also found to increase with increasing Strouhal number while propulsive efficiency peaks within the range of 0.2 < < 0.4, which lies in the middle of the range observed in nature. The appropriate combination of flexibility and Strouhal number illustrates higher efficiency and gives instruction for further design of flexible flapping fins.

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Section: Coupling Strategymentioning

confidence: 99%

Numerical investigation on the propulsive performance of flexible flapping fins using CFD/CSD method

Liu¹,

Ang²

2017

J. vibroeng.

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“…Many works focused on the modeling and simulation of additive manufacturing, among them [3,10,11,13,14,15,16,17,18,19,20,22]. One of the main obstacles to an efficient simulation of AM processes for predicting part distortions, independently of the model richness, is related to the numerical model itself, by the fact of assembling and solving very large systems of equations at each time step and in a geometry that is evolving in time [1].…”

Section: Introductionmentioning

confidence: 99%

Parametric numerical solutions of additive manufacturing processes

Quaranta

Haug

Duval

et al. 2019

AIP Conference Proceedings

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Additive manufacturing is the more and more considered in industry, however efficient simulation tools able to perform accurate predictions are still quite limited. The main difficulties for an efficient simulation are related to the multiple scales, the multiple and complex physics involved, as well as the strong dependency on the process trajectory. In [21] authors proposed the use of advanced model reduction techniques for performing parametric simulations of additive manufacturing processes, where deposition trajectory, the intensity of the thermal shrinkage and the deposited layers were considered as model parameters. The resulting simulation tool allowed evaluating in real-time the impact of the parameters just referred on the part distortion, and proceed to the required geometrical compensation. In the present work we address the use of that parametric solution with three different purposes: (i) evaluating the parameters leading to the minimal part distortion; (ii) evaluating the solution sensitivity to the different parameters, and in particular to the ones related to the deposition trajectory; and (iii) propagating the uncertainty related to the intensity of the thermal shrinkage.

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“…The present study addresses a numerical study on the aerodynamic characteristics of multiple flapping wing configurations, by using an overset grid technique proposed by Deng et al [8] to guarantee mesh quality when large deformation happens. Three different two-dimensional flapping configurations are considered: 1) single wing with a combined plunge-pitch mode, 2) tandem arrangement with a stationary tail and 3) biplane configurations with two opposed flapping wings as well as a tail.…”

Section: Introductionmentioning

confidence: 99%

“…a) Computed by overset gridin present study b) Computed by conformal hybrid-grids, adapted from Ref [8]. c) Computed by overset grid, adapted from Ref [7].…”

mentioning

confidence: 96%

Aerodynamic characteristics of multiple flapping wing configurations

Shen¹,

Cai²

2016

J. vibroeng.

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Natural flyers and man-made MAVs generally use multiple flapping wing configurations. To understand the aerodynamic performance, three different flapping configurations: single wing, tandem wings, and biplane wings are numerically simulated by a URANS solver coupled with an overset grid method. Moreover, effect of kinematics including oscillating frequency, angle of attack and wing to tail distance are detailed investigated. Results show that the wing-tail interaction significantly benefits the thrust generation when the wings are tandem arranged. Additionally, the tandem arrangement is the most efficiency configuration when applied with high frequencies.Biplane wings model has the most inefficiency propulsive performance, nevertheless it can provide an extensive aerodynamic force. With the increasing AOA, biplane has the largest critical angle from thrust to drag. Wing-tail interaction becomes weaker when the tail is mounted further from the flapping wings. The present of the tail in tandem model bring more benefits compared with the tail in biplane model. The tail in biplane model is only functional for flight control when applied with a non-zero angle of attack.

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A dynamic mesh strategy applied to the simulation of flapping wings

Cited by 11 publications

References 51 publications

Numerical investigation on the propulsive performance of flexible flapping fins using CFD/CSD method

Numerical investigation on the propulsive performance of flexible flapping fins using CFD/CSD method

Parametric numerical solutions of additive manufacturing processes

Aerodynamic characteristics of multiple flapping wing configurations

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