Unstructured dynamic mesh for large movement and deformation

Matsushima, Kisa; Murayama, Mitsuhiro; Nakahashi, K.

doi:10.2514/6.2002-122

Cited by 28 publications

(4 citation statements)

References 20 publications

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“…The double-layer absorber contains more detailed structural features, so the flow field shape is complex. The dynamic mesh method requires real-time reconstruction of the excessively distorted meshes in the changing flow field [46]. So, it is not realistic to numerically simulate the entire WEC with the existing computing resources in the laboratory, and this is also not necessary.…”

Section: Configuration Of Numerical Simulationsmentioning

confidence: 99%

Using Flexible Blades to Improve the Performance of Novel Small-Scale Counter-Rotating Self-Adaptable Wave Energy Converter for Unmanned Marine Equipment

Sun

Shang

Luo

et al. 2019

JMSE

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Unmanned marine equipment has been increasingly developed for open seas. The lack of efficient and reliable power supply is currently one of the bottlenecks restricting the practical application of these devices. In order to provide a viable power supply method for unmanned marine equipment, such as sonic buoys and sea robots, we originally propose a novel small-scale flexible blade wave energy converter (WEC) based on self-adaptable counter-rotating operation mechanism. The flexible blade WEC is designed on the basis of the rigid blade WEC with the caging device. This paper identifies the key factors affecting WEC performance through theoretical analysis. According to the numerical simulation analysis, the output mechanical power of the double-layer absorber is 12.8 W, and the hydraulic efficiency is 36.3%. The results of the verification experiment show that the peak power of WEC is 5.8 W and the average power is 3.2 W. The WEC with 65Mn flexible blade under most experimental conditions has the best performance when the blade thickness is 0.10 mm. The study shows that the new generation WEC can effectively overcome the excessive fluctuation of the output power of the previous generation WEC. The output power curve of the novel WEC is relatively smooth, which is conducive to its smooth operation and subsequent utilization and storage of electrical energy.

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Section: Configuration Of Numerical Simulationsmentioning

confidence: 99%

Using Flexible Blades to Improve the Performance of Novel Small-Scale Counter-Rotating Self-Adaptable Wave Energy Converter for Unmanned Marine Equipment

Sun

Shang

Luo

et al. 2019

JMSE

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“…In the case of double-regulated turbines, a moving mesh is required for the runner blades as well. Various moving mesh methods have been employed for different industrial applications, such as the movement of the junction between the airplane tail and the fuselage [14] or free surface flows [15]. A transient numerical model of a pump-turbine was developed using a dynamic mesh method and re-meshing techniques in order to model the flow during load rejection [16].…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation of the Flow in a Kaplan Turbine Model during Transient Operation from the Best Efficiency Point to Part Load

et al. 2020

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The aim of this study is to develop a reliable numerical model that provides additional information to experimental measurements and contributes to a better exploitation of hydraulic turbines during transient operation. The paper presents a numerical analysis of the flow inside a Kaplan turbine model operated at a fixed runner blade angle during load variation from the best efficiency point (BEP) to part load (PL) operation. A mesh displacement is defined in order to model the closure of the guide vanes. Two different types of inlet boundary conditions are tested for the transient numerical simulations: linear flow rate variation (InletFlow) and constant total pressure (InletTotalPressure). A time step analysis is performed and the influence of the time discretization over the fluctuating quantities is discussed. Velocity measurements at the corresponding operating points are available to validate the simulation. Spectrogram plots of the pressure signals show the times of appearance of the plunging and rotating modes of the rotating vortex rope (RVR) and the stagnation region developed around the centerline of the draft tube is captured.

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“…Several smoothing methods are available, each with varying complexity and computational costs. Three commonly used methods include [34][35][36][37][38]: (i) elliptic mesh generation smoothing, such as the Laplacian smoothing [35,[39][40][41][42][43][44][45]; (ii) forced-based smoothing, using spring-like methods [34,46]; (iii) smoothing methods based on structural mechanics, such as elastic smoothing [36,37,47] (sometimes with the combination of the FEM Jacobian-based stiffening [48,49]) or hyperelastic smoothing [50][51][52].…”

mentioning

confidence: 99%

Simulation of the Frequency Response Analysis of Gas Diffusion in Zeolites by Means of Computational Fluid Dynamics

Grau Turuelo,

Grün,

Breitkopf

2023

Minerals

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Frequency response (FR) analysis allows the characterization of gas diffusion occurring within a porous solid system. The shape of the pressure response curves obtained after a volume modulation in the reactor gives essential information about the gas adsorption and desorption properties of the porous material, e.g., zeolites, which is in contact with a certain gas environment, as well as information about the transport phenomena such as diffusion. In this work, a simulation model developed in COMSOL Multiphysics® is introduced to reproduce the experimental behavior of the tested solid/gas systems. This approach covers, for the first time, a coupling of computational fluid dynamics (CFD), porous media flow, and a customized mass adsorption/desorption function to simulate the behavior of real frequency response systems. The simulation results are compared to experimental data obtained from the interaction of propane in MFI zeolites as well as additional data from the literature to evaluate the model validity. Furthermore, a small variation study of the effect of simulation parameters such as the mass of the sample, bed porosity, or geometry is performed and analyzed. The essential advantage of this model with respect to other analytical approaches is to observe the spatial pressure and adsorption distribution (along with other local effects) of the gas within the porous material. Thus, local environments can be visualized, and non-idealities can, therefore, be detected in contrast to the general integral simulation approach.

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Unstructured dynamic mesh for large movement and deformation

Cited by 28 publications

References 20 publications

Using Flexible Blades to Improve the Performance of Novel Small-Scale Counter-Rotating Self-Adaptable Wave Energy Converter for Unmanned Marine Equipment

Using Flexible Blades to Improve the Performance of Novel Small-Scale Counter-Rotating Self-Adaptable Wave Energy Converter for Unmanned Marine Equipment

Numerical Simulation of the Flow in a Kaplan Turbine Model during Transient Operation from the Best Efficiency Point to Part Load

Simulation of the Frequency Response Analysis of Gas Diffusion in Zeolites by Means of Computational Fluid Dynamics

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