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fluid-structure interaction with H(div)-conforming finite elements

COMPUTERS & structureS 2021年 243卷

作者： Neunteufel, Michael Schoberl, Joachim Tech Univ Wien Inst Anal & Sci Comp Wiedner Hauptstr 8-10 A-1040 Vienna Austria

In this paper a novel application of the (high-order) H(div)-conforming Hybrid Discontinuous Galerkin finite element method for monolithic fluid-structure interaction (FSI) is presented. The Arbitrary Lagrangian Eulerian (ALE) description is derived for H(div)-conforming finite elements including the Piola transformation, yielding exact divergence free fluid velocity solutions. The arising method is demonstrated by means of the benchmark problems proposed by Turek and Hron (2006). With hp-refinement strategies singularities and boundary layers are overcome leading to optimal spatial convergence rates. (C) 2020 Elsevier Ltd. All rights reserved.

关键词： fluid-structure interaction Arbitrary Lagrangian Eulerian Divergence free velocity Hybrid discontinuous Galerkin Hp finite element method

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Projection Based Semi-Implicit Partitioned Reduced Basis Method for fluid-structure interaction Problems

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JOURNAL OF SCIENTIFIC COMPUTING 2023年第1期94卷 4-4页

作者： Nonino, Monica Ballarin, Francesco Rozza, Gianluigi Maday, Yvon Univ Vienna Dept Math Oskar Morgenstern Pl A-1090 Vienna Austria Univ Cattolica Sacro Cuore Dipartimento Matemat & Fis Via Garzetta I-25133 Brescia Italy Scuola Int Super Studi Avanzati MathLab Via Bonomea I-34136 Trieste Italy Univ Paris 06 Lab Jacques Louis Lions Pl Jussieu F-75005 Paris France

In this manuscript a POD-Galerkin based Reduced Order Model for unsteady fluid-structure interaction problems is presented. The model is based on a partitioned algorithm, with semi-implicit treatment of the coupling conditions. A Chorin-Temam projection scheme is applied to the incompressible Navier-Stokes problem, and a Robin coupling condition is used for the coupling between the fluid and the solid. The coupled problem is based on an Arbitrary Lagrangian Eulerian formulation, and the Proper Orthogonal Decomposition procedure is used for the generation of the reduced basis. We extend existing works on a segregated Reduced Order Model for fluid-structure interaction to unsteady problems that couple an incompressible, Newtonian fluid with a linear elastic solid, in two spatial dimensions. We consider three test cases to assess the overall capabilities of the method: an unsteady, non-parametrized problem, a problem that presents a geometrical parametrization of the solid domain, and finally, a problem where a parametrization of the solid's shear modulus is taken into account.

关键词： fluid-structure interaction Reduced basis method Segregated algorithm Proper orthogonal decomposition Incompressible fluid Elastic solid

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Study on fluid-structure interaction characteristics for coaxial cylindrical shells with liquid in the annular gap

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ANNALS OF NUCLEAR ENERGY 2023年 182卷

作者： Li, Donghao Lu, Daogang Zhu, Yuxuan Liu, Yu Zhang, Chaofan Duan, Dexuan North China Elect Power Univ Sch Nucl Sci & Engn Beijing 102206 Peoples R China Beijing Key Lab Pass Safety Technol Nucl Energy Beijing 102206 Peoples R China

There are many coaxial cylindrical thin-wall structures with narrow fluid gaps in the reactor vessel of the pooltype fast reactor. The fluid-structure interaction characteristics of such structures are important for the reactor's safety in an earthquake. However, the fluid-structure interaction characteristics of coaxial cylindrical shells with different boundary conditions and the inner-outer-shell coupling remains to be explored. In this paper, we study the added mass for the shell-type vibration of single-end-fixed coaxial cylindrical shells by vibration experiments and the finite element method (FEM). Then, we study the influence of the outer shell's rigidity and different boundary conditions (single-end-fixed and double-end-fixed cylinder) on the modal frequency and the added mass by the FEM. It shows that different boundary conditions cause a 50% difference in the added mass with modes with small circumferential wave numbers. This work provides a benchmark for strong fluid-structure interaction for flexible double shells with small fluid gaps.

关键词： fluid-structure interaction Added mass Vibration experiments Coaxial thin-wall shell Shell model

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A fluid-structure interaction Tool Using a Van der Pol-Based Reduced-Order Model for Buffet and Nonsynchronous Vibrations

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JOURNAL OF TURBOMACHINERY-TRANSACTIONS OF THE ASME 2023年第1期145卷 011009-011009页

作者： Hollenbach, Richard Kielb, Robert Hall, Kenneth Duke Univ Pratt Sch Engn Thomas Lord Dept Mech Engn Durham NC 27703 USA Duke Univ Pratt Sch Engn Thomas Lord Dept Mech Engn Durham NC 27708 USA

This paper builds upon a two-degree-of-freedom Van der Pol oscillator-based reduced-order model for studying the mechanisms around nonsynchronous vibrations (NSV) in turbomachinery. One degree tracks the fluid motion utilizing a combination of a traditional Van der Pol oscillator and a Duffing oscillator;the other degree of freedom is a mass on a spring and a damper, in this case, a cylinder. Thus, this model can be considered one of fluid-structure interaction. The cubic stiffening from the Duffing oscillator proved to improve the match to experimental data. Using this model to study the time history of the fluid and the structure oscillation, additional parameters are extracted to understand the underlying mechanisms of frequency lock-in and limit cycle oscillation. First, the phase shift between the vortex shedding and the structural motion is calculated when it locks-in and then unlocks. Second, the work done per cycle is analyzed from the contributions of the mass, spring, and damping forces to determine the dominant contributor when locking-in versus unlocking. Third, the phase portrait is plotted on a Poincare map to further study the locked-in versus unlocked responses. This model is then validated against not only experimental data but also computational simulation results and previous reduced-order models. The finalized model can now serve as a preliminary design tool for turbomachinery applications. For more realistic and accurate modeling, the third degree of freedom in the form of an airfoil pitching motion will be added in a separate paper as well.

关键词： nonsynchronous vibrations Van der Pol fluid-structure interaction reduced order model computational fluid dynamics (CFD) fan compressor turbine aerodynamic design

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Effect of TAVR commissural alignment on coronary flow: A fluid-structure interaction analysis

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COMPUTER METHODS AND PROGRAMS IN BIOMEDICINE 2023年 242卷 107818-107818页

作者： Oks, David Houzeaux, Guillaume Vazquez, Mariano Neidlin, Michael Samaniego, Cristobal Barcelona Supercomp Ctr Comp Applicat Sci & Engn Placa Eusebi Guell 1-3 Barcelona 08034 Spain ELEM Biotech SL Placa Pau Vila1 Bloc APlanta 3Porta 3A1 Barcelona 08003 Spain Rhein Westfal TH Aachen Med Fac Inst Appl Med Engn Dept Cardiovasc Engn Pauwelstr 20 D-52074 Aachen Germany

Background and Objectives: Coronary obstruction is a complication that may affect patients receiving Transcatheter Aortic Valve Replacement (TAVR), with catastrophic consequences and long-term negative effects. To enable healthy coronary perfusion, it is fundamental to appropriately position the device with respect to the coronary ostia. Nonetheless, most TAVR delivery systems do not control commissural alignment to do so. Moreover, no in silico study has directly assessed the effect of commissural alignment on coronary perfusion. This work aims to evaluate the effect of TAVR commissural alignment on coronary perfusion and device ***: A two-way computational fluid-structure interaction model is used to predict coronary perfusion at different commissural alignments. Moreover, in each scenario, hemodynamic biomarkers are evaluated to assess device ***: Commissural misalignment is shown to reduce the total coronary perfusion by -3.2% and the flow rate to a single coronary branch by -6.8%. It is also observed to impair valvular function by reducing the systolic geometric orifice area by -2.5% and increasing the systolic transvalvular pressure gradients by +5.3% and the diastolic leaflet stresses by +16.0%.Conclusions: The present TAVR patient model indicates that coronary perfusion, hemodynamic and structural performance are minimized when the prosthesis commissures are fully misaligned with the native ones. These results support the importance of enabling axial control in new TAVR delivery catheter systems and defining recommended values of commissural alignment in upcoming clinical treatment guidelines.

关键词： TAVR Coronary flow fluid-structure interaction In silico High-performance computing Hemodynamics

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Neural-network-based fluid-structure interaction applied to vortex-induced vibration

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JOURNAL OF COMPUTATIONAL AND APPLIED MATHEMATICS 2023年 428卷

作者： Bublik, Ondrej Heidler, Vaclav Pecka, Ales Vimmr, Jan Univ West Bohemia Fac Appl Sci NTIS New Technol Informat Soc Tech 8 Plzen 30100 Czech Republic Univ West Bohemia Fac Appl Sci Dept Mech Tech 8 Plzen 30100 Czech Republic

In this paper, a fluid-structure interaction (FSI) solver with neural-network-based fluid -flow prediction is proposed. This concept is applied to the problem of vortex-induced vibration of a cylinder. The majority of studies that are concerned with fluid-flow prediction using neural networks solve problems with fixed boundary. In this paper, a convolutional neural network (CNN) is used to predict unsteady incompressible laminar flow with moving boundary. A deformable non-Cartesian grid, which traces the boundary of the fluid domain, is used in this paper. The CNN is trained for oscillating cylinder with various frequencies and amplitudes. The dynamics of the elastically -mounted cylinder is modelled using a linear spring-mass-damper model and solved by an implicit differential scheme. The results show that the CNN-based FSI solver is capable of capturing the so-called lock-in phenomenon for the problem of vortex -induced vibration of a cylinder and the quantitative behaviour is similar to the results of the CFD-based FSI solver. Moreover, the CNN-based FSI solver is two orders of magnitude faster than the CFD-based FSI solver and the speedup is expected to be even greater on larger problems. (c) 2023 Elsevier B.V. All rights reserved.

关键词： Convolution neural network Unsteady fluid flow Vortex -induced vibration fluid-structure interaction

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Investigation of the effect of adaptive characteristics on non-cavitating noise for flexible propeller in non-uniform flow via the fluid-structure interaction model

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INTERNATIONAL JOURNAL OF NAVAL ARCHITECTURE AND OCEAN ENGINEERING 2023年 15卷

作者： Choi, Yo-Seb Hong, Suk-Yoon Song, Jee-Hun Seoul Natl Univ Dept Naval Architecture & Ocean Engn Seoul South Korea Seoul Natl Univ Inst Engn Res Seoul South Korea Chonnam Natl Univ Dept Naval Architecture & Ocean Engn Yeosu South Korea

When constructing a low-noise submarine, it is crucial to consider the non-cavitating noise from the propeller. Non-cavitating noise reduction is crucial for submarine stealth and survivability. Recently, several studies have been conducted on the use of flexible propellers as a means of reducing non-cavitating noise. However, there are no studies on the use of flexible propellers with adaptive charac-teristics to reduce noise in wake fields. Thus, this study investigated the noise reduction effect of adaptive characteristics on non-cavitating noise for the flexible propeller in the wake field. Numerical in-vestigations on the main propeller variables were conducted based on the proposed procedure using fluid-structure interaction and acoustic analysis models. The results were compared with those of rigid propellers to determine the possible reasons for noise reduction. Finally, the acoustic analysis results of the flexible propeller were compared with those of the rigid propeller to reveal the effectiveness of the adaptive characteristics.& COPY;2023 Society of Naval Architects of Korea. Production and hosting by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://***/licenses/by-nc-nd/4.0/).

关键词： Flexible propeller Adaptive characteristics Non-cavitating noise fluid-structure interaction Non-uniform flow

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Design of a high fidelity fluid-structure interaction solver using LES on unstructured grid

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COMPUTERS & fluidS 2023年第1期265卷

作者： Fabbri, T. Balarac, G. Moureau, V. Benard, P. Univ Grenoble Alpes Grenoble INP CNRS LEGI F-38000 Grenoble France Inst Univ France IUF Paris France Normandie Univ INSA Rouen UNIROUEN CNRSCORIA F-76000 Rouen France

Despite promising experimental works, high fidelity numerical simulations of chordwise flexible blade are useful to better understanding. However, such simulation remains a challenging problem as it requires a fluid- structure interaction (FSI) solver capable of accurately predicting the stall dynamics, while computing the deformation of a solid with complex geometry. In this paper, the authors propose a LES-based FSI solver using 3D solid elements for the solid and unstructured grid for fluid and solid solvers. This approach aims at being universal and is based on a partitioned coupling scheme, allowing low density ratios of the structure to the fluid. It uses an original pseudo-solid method for the mesh movement solving, specifically developed for this work. Besides, this solver is suited for massively parallel computing and can perform Dynamic Mesh Adaptation to be able to take into account any solid movement. Both fluid and solid solvers are validated independently before validation of the FSI solver against a 2D laminar benchmark, including mesh convergence study. The entire methodology is then successfully applied to experimental 3D complex case with high Reynolds number, confirming the potential of the FSI solver for its intended use, without geometry restriction. This is finally illustrated with a simulation of an experiment involving a chordwise flexible blade with large deformation, which has never been reproduced with a 3D LES approach in literature so far.

关键词： fluid-structure interaction Large-Eddy Simulation Finite Element Method Unstructured grid Dynamic Mesh Adaptation Mesh movement Pseudo-solid Partitioned scheme Chordwise flexible foil

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A fluid-structure interaction model for large wind turbines based on flexible multibody dynamics and actuator line method

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JOURNAL OF fluidS AND structureS 2023年第1期118卷

作者： Leng, Jun Gao, Zhiteng Wu, Michael C. H. Guo, Tao Li, Ye Shanghai Jiao Tong Univ Sch Naval Architecture Ocean & Civil Engn Multiple Funct Towing Tank Lab State Key Lab Ocean Engn Shanghai 200240 Peoples R China Brown Univ Sch Engn 184 Hope St Providence RI 02912 USA Ansys Inc Livermore CA 94551 USA Gansu Wind Technol Ctr Lanzhou 730050 Gansu Peoples R China

With higher demand of affordable electricity and rapid development of wind turbine technology, scale of wind turbines has been upsizing. As a consequence, blades grow longer and slender. Large geometrically nonlinear deformation and vibration of the blades lead to more challenges in the structural design. In the aerodynamic analysis, traditional blade element momentum theory cannot predict the complicated behavior of these modern blades while fully resolved Navier-Stokes equation methods cost much time modeling and refinement. To overcome these challenges, this paper proposes a new numerical method to analyze turbine aeroelastic performance and fluid-structure interaction based on flexible multibody dynamics and large eddy simulation with anisotropic actuator line method. By comparing the results with various existing numerical methods, we show that the newly proposed method can effectively predict the performance of the wind turbine, such as deformation and power output. We find that blade flexibility poses noticeable impact on the performance of large scale turbines in normal working conditions. The location of nascent vortex is postponed by blade deflection. The max difference between rigid and flexible blades in downstream velocity distributions reaches 10% and occurs at a radial distance around 0.55D. The new method also takes the fluid- structure coupling effect and momentum interaction into consideration and eliminates the non-physical oscillations caused by uncoupled methods. Also, blades deflection and vibration are found to accelerate momentum exchange, which facilitates the wake recovery process. Furthermore,compared to the rigid-blade model, the turbulent kinetic energy obtained by the newly developed flexible-blade model is higher in the lowfrequency region, in which large-scale vortices develop and the turbulent mixing effect is strong. This paper is expected to provide a framework for researchers and technology developers to design or estimate the per

关键词： fluid-structure interaction Aeroelastic analysis Large scale wind turbine Power prediction Geometrically exact beam theory Actuator line method

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Thermo-Mechanical fluid-structure interaction Numerical Modelling and Experimental Validation of MEMS Electrothermal Actuators for Aqueous Biomedical Applications

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MICROMACHINES 2023年第6期14卷 1264-1264页

作者： Sciberras, Thomas Demicoli, Marija Grech, Ivan Mallia, Bertram Mollicone, Pierluigi Sammut, Nicholas Univ Malta Fac Engn Dept Mech Engn Msida MSD 2080 Malta Univ Malta Inst Sustainable Energy Marsaxlokk MXK 1531 Malta Univ Malta Fac Informat & Commun Technol Dept Microelect & Nanoelect Msida MSD 2080 Malta Univ Malta Fac Engn Dept Met & Mat Engn Msida MSD 2080 Malta

Recent developments in MEMS technologies have made such devices attractive for use in applications that involve precision engineering and scalability. In the biomedical industry, MEMS devices have gained popularity in recent years for use as single-cell manipulation and characterisation tools. A niche application is the mechanical characterisation of single human red blood cells, which may exhibit certain pathological conditions that impart biomarkers of quantifiable magnitude that are potentially detectable via MEMS devices. Such applications come with stringent thermal and structural specifications wherein the potential device candidates must be able to function with no exceptions. This work presents a state-of-the-art numerical modelling methodology that is capable of accurately predicting MEMS device performance in various media, including aqueous ones. The method is strongly coupled in nature, whereby thermal as well as structural degrees of freedom are transferred to and from finite element and finite volume solvers at every iteration. This method therefore provides MEMS design engineers with a reliable tool that can be used in design and development stages and helps to avoid total reliability on experimental testing. The proposed numerical model is validated via a series of physical experiments. Four MEMS electrothermal actuators with cascaded V-shaped drivers are presented. With the use of the newly proposed numerical model as well as the experimental testing, the MEMS devices' suitability for biomedical applications is confirmed.

关键词： numerical modelling electrothermal actuator (ETA) V-shaped driver microelectromechanical system (MEMS) fluid-structure interaction finite element finite volume submerged underwater aqueous

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