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fluid-structure interaction simulation of floating structures interacting with complex, large-scale ocean waves and atmospheric turbulence with application to floating offshore wind turbines

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JOURNAL OF COMPUTATIONAL PHYSICS 2018年 355卷 144-175页

作者： Calderer, Antoni Guo, Xin Shen, Lian Sotiropoulos, Fotis Univ Minnesota St Anthony Falls Lab 2 Third Ave SE Minneapolis MN 55414 USA Univ Minnesota Dept Mech Engn 111 Church St SE Minneapolis MN 55455 USA SUNY Stony Brook Coll Engn & Appl Sci Dept Civil Engn Stony Brook NY 11794 USA

We develop a numerical method for simulating coupled interactions of complex floating structures with large-scale ocean waves and atmospheric turbulence. We employ an efficient large-scale model to develop offshore wind and wave environmental conditions, which are then incorporated into a high resolution two-phase flow solver with fluid-structure interaction (FSI). The large-scale wind-wave interaction model is based on a two-fluid dynamically-coupled approach that employs a high-order spectral method for simulating the water motion and a viscous solver with undulatory boundaries for the air motion. The two-phase flow FSI solver is based on the level set method and is capable of simulating the coupled dynamic interaction of arbitrarily complex bodies with airflow and waves. The large-scale wave field solver is coupled with the near-field FSI solver with a one-way coupling approach by feeding into the latter waves via a pressure-forcing method combined with the level set method. We validate the model for both simple wave trains and three-dimensional directional waves and compare the results with experimental and theoretical solutions. Finally, we demonstrate the capabilities of the new computational framework by carrying out large-eddy simulation of a floating offshore wind turbine interacting with realistic ocean wind and waves. (c) 2017 Elsevier Inc. All rights reserved.

关键词： fluid-structure interaction Two-phase free surface flow Large-eddy simulation Level set method Wind Wave

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fluid-structure interaction analysis of buoyancy-driven fluid and heat transfer through an enclosure with a flexible thin partition

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INTERNATIONAL JOURNAL OF NUMERICAL METHODS FOR HEAT & fluid FLOW 2018年第9期28卷 2072-2088页

作者： Zargartalebi, H. Ghalambaz, M. Chamkha, A. Pop, Ioan Nezhad, Amir Sanati Univ Calgary Ctr Bioengn Res & Educ Dept Mech & Mfg Engn Calgary AB Canada Islamic Azad Univ Dept Mech Engn Dezful Iran Prince Mohammad Bin Fahd Univ Dept Mech Engn Al Khobar Saudi Arabia Amer Univ Ras Al Khaimah RAK Res & Innovat Ctr Ras Al Khaymah U Arab Emirates Babes Bolyai Univ Dept Appl Math Cluj Napoca Romania

Purpose A numerical model of an unsteady laminar free convection flow and heat transfer is studied in a cavity that comprises a vertical flexible thin partition. Design/methodology/approach The left and right vertical boundaries are isothermal, while the horizontal boundaries are insulated. Moreover, the thin partition, placed in the geometric centerline of the enclosure, is considered to be hyper elastic and diathermal. Galerkin finite-element methods, the system of partial differential equations along with the appropriate boundary conditions are transformed to a weak form through the fluid-structure interaction and solved numerically. Findings The heat transfer characteristics of the enclosure with rigid and flexible partitions are compared. The effect of Rayleigh number and Young's modulus on the maximum nondimensional stress and final deformed shape of the membrane is addressed. Originality/value Incorporation of vertical thin flexible membrane in middle of a cavity has numerous industrial applications, and it could noticeably affect the heat and mass transfer in the enclosure.

关键词： fluid-structure interaction Flexible thin partition Lagrangian-Eulerian formulation Unsteady free convection

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fluid-structure interaction of a pulsatile flow with an aortic valve model: A combined experimental and numerical study

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INTERNATIONAL JOURNAL FOR NUMERICAL METHODS IN BIOMEDICAL ENGINEERING 2018年第4期34卷 e2945-e2945页

作者： Siguenza, Julien Pott, Desiree Mendez, Simon Sonntag, Simon J. Kaufmann, Tim A. S. Steinseifer, Ulrich Nicoud, Franck Univ Montpellier CNRS IMAG Montpellier France Rhein Westfal TH Aachen Inst Appl Med Engn Helmholtz Inst Dept Cardiovasc Engn Aachen Germany Sim&Cure Cap Gamma 1682 Rue Valsiere F-34790 Grabels France

The complex fluid-structure interaction problem associated with the flow of blood through a heart valve with flexible leaflets is investigated both experimentally and numerically. In the experimental test rig, a pulse duplicator generates a pulsatile flow through a biomimetic rigid aortic root where a model of aortic valve with polymer flexible leaflets is implanted. High-speed recordings of the leaflets motion and particle image velocimetry measurements were performed together to investigate the valve kinematics and the dynamics of the flow. Large eddy simulations of the same configuration, based on a variant of the immersed boundary method, are also presented. A massively parallel unstructured finite-volume flow solver is coupled with a finite-element solid mechanics solver to predict the fluid-structure interaction between the unsteady flow and the valve. Detailed analysis of the dynamics of opening and closure of the valve are conducted, showing a good quantitative agreement between the experiment and the simulation regarding the global behavior, in spite of some differences regarding the individual dynamics of the valve leaflets. A multicycle analysis (over more than 20 cycles) enables to characterize the generation of turbulence downstream of the valve, showing similar flow features between the experiment and the simulation. The flow transitions to turbulence after peak systole, when the flow starts to decelerate. Fluctuations are observed in the wake of the valve, with maximum amplitude observed at the commissure side of the aorta. Overall, a very promising experiment-vs-simulation comparison is shown, demonstrating the potential of the numerical method.

关键词： aortic valve fluid-structure interaction flexible leaflets immersed boundary method large eddy simulation multi-cycle analysis particle image velocimetry turbulence unstructured fluid solver

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fluid-structure interaction simulation of slam-induced bending in large high-speed wave-piercing catamarans

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JOURNAL OF fluidS AND structureS 2018年 82卷 35-58页

作者： McVicar, Jason Lavroff, Jason Davis, Michael R. Thomas, Giles Revolut Design Pty Ltd Hobart Tas Australia Univ Tasmania Hobart Tas Australia UCL London England

A ship in waves may experience a water impact event known as a slam. In this paper, slam-induced bending of wave-piercing catamarans in head seas is predicted by way of fluid-structure interaction simulations. The flow field during slamming of a wave-piercing catamaran is highly non-linear and cannot be accurately captured using potential flow methods as a result of the interactions between the flow fields produced by water entry of the separate demihulls and centre bow. Thus, the Reynolds-Averaged Navier-Stokes (RANS) equations are solved for rigid body motion of a vessel at model-scale. Verification and validation is conducted using model-scale data from a Hydroelastic Segmented Model (HSM). One-way and two-way interactions are computed considering vibration of the hull girder. In the case of one-way interactions, the computed fluid loads affect the structure, but the structural response does not affect the fluid domain solution whereas for the two-way interactions the structural response affects the fluid solution. A new method for capturing the non-linear time variation in added mass is developed and deemed necessary when computing one-way interactions, primarily as a result of the large changes in forward wetted area present for a wave-piercing catamaran. It is shown that two-way interaction simulation is not needed for predicting the slam induced hull girder loads. One-way interaction simulation can therefore be used allowing reduced computational effort. (C) 2018 Elsevier Ltd. All rights reserved.

关键词： Slamming Whipping fluid-structure interaction Hydroelasticity Catamaran Wave-piercing

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Effects of aspect ratio, wall thickness and hypertension in the patient-specific computational modeling of cerebral aneurysms using fluid-structure interaction analysis

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ENGINEERING APPLICATIONS OF COMPUTATIONAL fluid MECHANICS 2019年第1期13卷 229-244页

作者： Sun, Hong Tao Sze, Kam Yim Tang, Abraham Yik Sau Tsang, Anderson Chun On Yu, Alfred Cheuk Hang Chow, Kwok Wing Univ Hong Kong Dept Mech Engn Pokfulam Hong Kong Peoples R China Univ Hong Kong Dept Surg Li Ka Shing Fac Med Pokfulam Hong Kong Peoples R China Univ Waterloo Dept Elect & Comp Engn Waterloo ON Canada

Intracranial aneurysm is a pathological dilatation of the cerebral artery which can lead to high mortality rate upon rupture. The aspect ratio (AR) of an aneurysm, being the ratio of the height to neck width, is an important factor in estimating the likelihood of aneurysm rupture in clinical practice. AR will generally increase while the aneurysm grows. Clinical observations over the years show that aneurysms with larger AR usually exhibit higher rupture risk. The goal of the current study is to conduct fluid-structure interaction (FSI) analyses to provide quantitative estimates on the importance of AR, wall thickness (t(w)) and hypertension. The effects of varying AR and t(w) on the hemodynamics, wall stress and displacement will be studied based on patient-specific models. Both sidewall and bifurcation aneurysms are investigated. There is a significant increase in the wall stress at the aneurysmal dome (the location in an aneurysm where rupture is commonly observed clinically) when the AR increases and t(w) decreases due to the aneurysm growth process. Furthermore, these investigations are repeated for patients with hypertension (high blood pressure) conditions. The increase in the wall stress due to hypertension for models with higher ARs is more dramatic. The clinically observed feature of higher rupture risk of aneurysms with larger AR is thus supported quantitatively.

关键词： Intracranial aneurysms fluid-structure interaction FSI aspect ratio wall thickness hypertension

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Development of a fluid-structure interaction model to simulate mitral valve malcoaptation

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PERFUSION-UK 2019年第3期34卷 225-230页

作者： Hassani, Kamran Karimi, Alireza Dehghani, Ali Golpaygani, Ali Tavakoli Abdi, Hamed Espino, Daniel M. Islamic Azad Univ Sci & Res Branch Dept Biomed Engn Daneshgah Sq Tehran 4515775 Iran Kyushu Univ Dept Mech Engn Nishi Ku 744 Motooka Fukuoka Fukuoka Japan Stand Res Inst Dept Biomed Engn Karaj Iran Univ Birmingham Dept Mech Engn Birmingham W Midlands England

Object: Mitral regurgitation (MR) is a condition in which the mitral valve does not prevent the reversal of blood flow from the left ventricle into the left atrium. This study aimed at numerically developing a model to mimic MR and poor leaflet coaptation and also comparing the performance of a normal mitral valve to that of the MR conditions at different gap junctions of 1, 3 and 5 mm between the anterior and posterior leaflets. Results: The results revealed no blood flow to the left ventricle when a gap between the leaflets was 0 mm. However, MR increased this blood flow, with increases in the velocity and pressure within the atrium. However, the pressure within the aorta did not vary meaningfully (ranging from 22 kPa for a 'healthy' model to 25 kPa for severe MR). Conclusions: The findings from this study have implications not only for understanding the changes in pressure and velocity as a result of MR in the ventricle, atrium or aorta, but also for the development of a computational model suitable for clinical translation when diagnosing and determining treatment for MR.

关键词： blood flow fluid-structure interaction left atrium left ventricle mitral regurgitation

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Coupling of IGA and peridynamics for air-blast fluid-structure interaction using an immersed approach

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FORCES IN MECHANICS 2021年 4卷

作者： Behzadinasab, Masoud Moutsanidis, Georgios Trask, Nathaniel Foster, John T. Bazilevs, Yuri Brown Univ Sch Engn 184 Hope St Providence RI 02912 USA SUNY Stony Brook Dept Civil Engn Stony Brook NY 11794 USA SUNY Stony Brook Inst Adv Computat Sci Stony Brook NY 11794 USA Sandia Natl Labs Ctr Comp Res Albuquerque NM 87185 USA Univ Texas Austin Hildebrand Dept Petr & Geosyst Engn Austin TX 78712 USA

We present a novel formulation based on an immersed coupling of Isogeometric Analysis (IGA) and Peridynamics (PD) for the simulation of fluid-structure interaction (FSI) phenomena for air blast. We aim to develop a practical computational framework that is capable of capturing the mechanics of air blast coupled to solids and structures that undergo large, inelastic deformations with extreme damage and fragmentation. An immersed technique is used, which involves an a priori monolithic FSI formulation with the implicit detection of the fluid-structure interface and without limitations on the solid domain motion. The coupled weak forms of the fluid and structural mechanics equations are solved on the background mesh. Correspondence-based PD is used to model the meshfree solid in the foreground domain. We employ the Non-Uniform Rational B-Splines (NURBS) IGA functions in the background and the Reproducing Kernel Particle Method (RKPM) functions for the PD solid in the foreground. We feel that the combination of these numerical tools is particularly attractive for the problem class of interest due to the higher-order accuracy and smoothness of IGA and RKPM, the benefits of using immersed methodology in handling the fluid-structure coupling, and the capabilities of PD in simulating fracture and fragmentation scenarios. Numerical examples are provided to illustrate the performance of the proposed air-blast FSI framework.

关键词： Air blast fluid-structure interaction Immersed methods Weak-form formulation Isogeometric analysis Meshfree methods Peridynamics Reproducing-kernel particle method Fracture mechanics

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Two-way fluid-structure interaction simulation for steady-state vibration of a slender rod using URANS and LES turbulence models

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NUCLEAR ENGINEERING AND TECHNOLOGY 2019年第2期51卷 573-578页

作者： Nazari, Tooraj Rabiee, Ataollah Kazeminejad, Hossein Shiraz Univ Sch Mech Engn Dept Nucl Engn Shiraz *** Iran Nucl Sci & Technol Res Inst Res Sch Radiat Applicat POB 11365-3486 Tehran Iran

Anisotropic distribution of the turbulent kinetic energy and the near-field excitations are the main causes of the steady state Flow-Induced Vibration (FIV) which could lead to fretting wear damage in vertically arranged supported slender rods. In this article, a combined Computational fluid Dynamics (CFD) and Computational Structural Mechanic (CSM) approach named two-way fluid-structure interaction (FSI) is used to investigate the modal characteristics of a typical rod's vibration. Performance of an Unsteady Reynolds-Average Navier-Stokes (URANS) and Large Eddy Simulation (LES) turbulence models on asymmetric fluctuations of the flow field are investigated. Using the LES turbulence model, any large deformation damps into a weak oscillation which remains in the system. However, it is challenging to use LES in two-way FSI problems from fluid domain discretization point of view which is investigated in this article as the innovation. It is concluded that the near-wall meshes whiten the viscous sub-layer is of great importance to estimate the Root Mean Square (RMS) of FIV amplitude correctly as a significant fretting wear parameter otherwise it merely computes the frequency of FIV. (C) 2018 Korean Nuclear Society, Published by Elsevier Korea LLC.

关键词： Flow-induced vibration fluid-structure interaction URANS LES Steady state vibration Viscous sub-layer

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Immersed Methods for fluid-structure interaction

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ANNUAL REVIEW OF fluid MECHANICS, VOL 52 2020年第1期52卷 421-448页

作者： Griffith, Boyce E. Patankar, Neelesh A. Univ N Carolina Dept Math Dept Appl Phys Sci Chapel Hill NC 27599 USA Univ N Carolina Dept Biomed Engn Chapel Hill NC 27599 USA Northwestern Univ Dept Mech Engn Evanston IL 60208 USA

fluid-structure interaction is ubiquitous in nature and occurs at all biological scales. Immersed methods provide mathematical and computational frameworks for modeling fluid-structure systems. These methods, which typically use an Eulerian description of the fluid and a Lagrangian description of the structure, can treat thin immersed boundaries and volumetric bodies, and they can model structures that are flexible or rigid or that move with prescribed deformational kinematics. Immersed formulations do not require body-fitted discretizations and thereby avoid the frequent grid regeneration that can otherwise be required for models involving large deformations and displacements. This article reviews immersed methods for both elastic structures and structures with prescribed kinematics. It considers formulations using integral operators to connect the Eulerian and Lagrangian frames and methods that directly apply jump conditions along fluid-structure interfaces. Benchmark problems demonstrate the effectiveness of these methods, and selected applications at Reynolds numbers up to approximately 20,000 highlight their impact in biological and biomedical modeling and simulation.

关键词： fluid-structure interaction immersed boundary method immersed interface method immersed finite-element method applications in medicine and biology

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fluid-structure interaction with NURBS-based coupling

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COMPUTER METHODS IN APPLIED MECHANICS AND ENGINEERING 2018年 332卷 520-539页

作者： Hosters, Norbert Helmig, Jan Stavrev, Atanas Behr, Marek Elgeti, Stefanie Rhein Westfal TH Aachen Ctr Computat Engn Sci Chair Computat Anal Tech Syst CATS D-52056 Aachen Germany

Engineering design via CAD software relies on Non-Uniform Rational B-Splines (NURBS) as a means for representing and communicating geometry. Therefore, in general, a NURBS description of a given design can be considered the exact description. The development of isogeometric methods has made the geometry available to analysis methods Hughes et al. (2005). Isogeometric analysis has been particularly successful in structural analysis;one reason being the wide-spread use of two-dimensional finite elements in this field. For fluid dynamics, where three-dimensional analysis is usually indispensable, isogeometric methods are more complicated, yet of course not impossible, to apply in a general fashion. This paper describes a method that enables the solution of fluid-structure-interaction with a matching spline description of the interface. On the structural side, the spline is used in an isogeometric setting. On the fluid side, the same spline is used in the framework of a NURBS-enhanced finite element method (extension of Sevilla et al. (2011)). The coupling of the structural and the fluid solution is greatly facilitated by the common spline interface. The use of the identical spline representation for both sides permits a direct transfer of the necessary quantities, all the while still allowing an adjusted, individual refinement level for both sides. (C) 2018 Elsevier B.V. All rights reserved.

关键词： Non-uniform rational B-splines Isogeometric analysis NURBS-enhanced finite element method fluid-structure interaction

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