Analysis results, obtained from numerical simulation, for non-linear and unsteady aeroelastic behavior of large horizontal-axis wind turbines are presented in this paper. Simulations are carried out using a partitione...
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Analysis results, obtained from numerical simulation, for non-linear and unsteady aeroelastic behavior of large horizontal-axis wind turbines are presented in this paper. Simulations are carried out using a partitioned scheme of weak interaction that allows dealing with the fluidstructureinteraction problem by using one method to solve the structural-dynamic problem and another method for the aerodynamic problem. The aerodynamic model used is the non-linear, unsteady vortex lattice method (NLUVLM). The structural model used is a system of beam finite elements and rigid bodies with finite rotation. This provides a very general tool with relatively low computational cost. The proposed method allows predicting from the operating conditions (wind speed and direction, pitch angle of blades, etc.) the aeroelastic response of wind turbines, characterized by variables such as rotation speed of the rotor, loads on the structural components and the extracted power, among others. Copyright (C) 2013, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.
As the excavation of tunnels, there are new channels of the groundwater drainage. The original supply of the circulatory system has been destroyed. The effects of groundwater to rock mass of surrounding rock are aggra...
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ISBN:
(纸本)9783038352587
As the excavation of tunnels, there are new channels of the groundwater drainage. The original supply of the circulatory system has been destroyed. The effects of groundwater to rock mass of surrounding rock are aggravated. In this paper, combined with a new highway tunnel project, the model is built according to the design parameters and the site engineering geological conditions of the tunnel. The fluid-structure interaction module of the finite difference software FLAC(3D) is used for the research on tunnel excavation. The distribution of seepage field, the stability of surrounding rock and rock deformation under saturated conditions during the tunnel excavation have been analyzed. The simulation results have certain guiding meaning on fracture development, the stability design of tunnels in water-rich stratum and the design and construction of anti-drainage.
We have developed novel numerical methods for fluid-structure and fluid-membrane interaction problems. The basic equation set is formulated in a full Eulerian framework. The method is based on the finite difference vo...
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We have developed novel numerical methods for fluid-structure and fluid-membrane interaction problems. The basic equation set is formulated in a full Eulerian framework. The method is based on the finite difference volume-of-fluid scheme with fractional step algorithm. It is validated through a numerical solution to a deformable vesicle problem, and applied to blood flows including red blood cells (RBCs) and platelets. Further, to gain insight into the mechanism of thrombus formation, a stochastic Monte Carlo model to describe the platelet-vessel wall interaction is incorporated into the Eulerian method. The effect of the RBCs on the platelet motion is discussed. (C) 2013 Published by Elsevier Ltd.
In this paper we present a multiscale model for the analysis of fluid-structure interaction which couples the three-dimensional vessel equations with an appropriate linked mono-dimensional system. This approach allows...
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ISBN:
(纸本)9788494284472
In this paper we present a multiscale model for the analysis of fluid-structure interaction which couples the three-dimensional vessel equations with an appropriate linked mono-dimensional system. This approach allows the study of transient phenomena with remarkable reduction of the computational complexity. This model, when large displacements are taken into account, is of considerable interest for time-dependent simulations of blood flow in components such as large arteries or blood vessels. The computational domain consists of two interacting fluid-structure regions: one described by the multidimensional Navier-Stokes system and the other defined by the structural mechanics equations. Due to the computational cost of fully three-dimensional fluid-structure interaction problems and the complexity of the cardiovascular system, this multi dimensional models can only be applied to selected regions of interest. According to this multiscale approach the rest of the blood circuit is represented by a mono dimensional formulation of the Navier-Stokes system. In particular the mono-dimensional model has to describe properly the wave propagation nature of blood flow and, when coupled with the rest of geometry, must act as a proper absorbing and generating device for the exiting waves inside the computational domain. The mono-three dimensional interface and the multi dimensional geometry of components such as heart valves add complexity to the treatment of inflow and outflow boundaries, where one would like to have a correct representation of the traveling waves, without spurious reflections which may compromise the stability of the solution. In this work we study the propagation of fluid waves into a multidimensional geometry solving fully coupled fluid-structure problem with multiscale approach and present the results of two different cases.
In this study, we have a research on wave action on the submarine launched missile water trajectory and gesture angles during the process between launch and exit from water. Infinite water depth plane wave was used as...
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The article presents a study that examined the use of a two-dimensional (2D) fluid-structure model to quantify the energy transfer between the fin and the water. It cites that the natural frequencies were compared to ...
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The article presents a study that examined the use of a two-dimensional (2D) fluid-structure model to quantify the energy transfer between the fin and the water. It cites that the natural frequencies were compared to quantify the added mass effect on the fin. Results have shown that the added mass of surrounding water has an impact on eigenfrequencies and modal shapes.
This paper is concerned with an analytical solution of transient flow on the four-equation model in fluid-structure interaction (FSI) for a reservoir-pipe-vane system subjected to a sudden closure of hydro turbine van...
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ISBN:
(纸本)9783037859063
This paper is concerned with an analytical solution of transient flow on the four-equation model in fluid-structure interaction (FSI) for a reservoir-pipe-vane system subjected to a sudden closure of hydro turbine vane. The analytical solution is derived corresponding to the junction coupling based on a vane motion. The result obtained from the analytical solution is used to analyze the coupling features between pipe transient flow and hydro turbine vane motion.
Maximum distribution of hydrodynamic pressure on the flume sidewall were studied in this paper based on the finite element method. It contains the difference comparison of theoretical and numerical formulas, rules of ...
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ISBN:
(纸本)9783037859735
Maximum distribution of hydrodynamic pressure on the flume sidewall were studied in this paper based on the finite element method. It contains the difference comparison of theoretical and numerical formulas, rules of maximum hydrodynamic pressure distribution under regular and irregular incentives, and hydrodynamic pressure changes with different height of bracket below the aqueduct. Studies show that: In the 30m height range, with the rise of bracket, the hydrodynamic pressure grows linearly.
Submarine pipelines are described as the lifeblood of offshore oil and it is crucial to ensure the seismic safety of the submarine pipelines. Based on the fluid-structure interaction numerical analysis method and by u...
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ISBN:
(纸本)9783038351658
Submarine pipelines are described as the lifeblood of offshore oil and it is crucial to ensure the seismic safety of the submarine pipelines. Based on the fluid-structure interaction numerical analysis method and by using finite element software ADINA, the analysis models of the free long-span submarine flexible pipelines under earthquakes were established. By employing dynamic time-history method, the influences of fluid-structure interaction on the seismic response of the submarine pipelines were researched. The results showed that the peak normal stress and the peak displacement of submarine pipelines' mid-span considering the influences of the fluid-structure interaction are greater than those without considering the influences, and the influences of the fluid-structure interaction on the seismic response of the submarine pipelines will increase with the increase of the submarine pipelines' diameter.
A 2-D finite element model of human cochlea is established in this paper. This model includes the structure of oval window, round window, basilar membrane and cochlear duct which is filled with fluid. The basilar memb...
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ISBN:
(纸本)9783037859285
A 2-D finite element model of human cochlea is established in this paper. This model includes the structure of oval window, round window, basilar membrane and cochlear duct which is filled with fluid. The basilar membrane responses are calculated with sound input on the oval window membrane. In order to study the effects of helicotrema on basilar membrane response, three different helicotrema dimensions are set up in the FE model. A two-way fluid-structure interaction numerical method is used to compute the responses in the cochlea. The influence of the helicotrema is acquired and the frequency selectivity of the basilar membrane motion along the cochlear duct is predicted. These results agree with the experiments and indicate much better results are obtained with appropriate helicotrema size.
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