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FRESIS 1.0: A fluid-rigid-elastic structure interaction solver

SOFTWARE IMPACTS 2023年 17卷

作者： Farahbakhsh, Iman Nia, Benyamin Barani Amirkabir Univ Technol Dept Maritime Engn Tehran Iran

FRESIS is developed based on a full-Eulerian mathematical framework and can be addressed as a tool for reproducible, extendable and efficient research in fluid-rigid-elastic structure interaction field. Due to the flexible algorithm which is implemented in Fortran, any application that requires the solution of fluid-rigid-elastic structure interaction problem, could benefit from FRESIS.

关键词： FRESIS fluid-structure interaction Navier-Stokes equation Vorticity-stream function

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fluid-structure interactions of Net Cages-Full-Scale Pushing Tests in the Field

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JOURNAL OF OFFSHORE MECHANICS AND ARCTIC ENGINEERING-TRANSACTIONS OF THE ASME 2024年第4期146卷 041301-041301页

作者： Gao, Sihan Oppedal, Frode Fosse, Jan Olav Tuene, Stig Atle Gansel, Lars Christian Norwegian Univ Sci & Technol Dept Ocean Operat & Civil Engn N-6025 Alesund Norway Norwegian Univ Sci & Technol Dept Biol Sci Alesund N-6025 Alesund Norway Inst Marine Res Anim Welf Grp N-5984 Matredal Norway

This paper presents field tests on a full-scale cage, with and without fish, being pushed by a boat in Masfjorden at various speeds. The purpose was to imitate the exposure of net cages to different currents. The tests involved measuring cage deformations, fish behaviors, and the corresponding flow upstream, downstream, and inside the cage. The study found that the experimental setup used can achieve predictable and stable upstream flow for a full-scale net cage. Based on pressure tag data, the volume reductions of the cage, both with and without fish, were estimated at different speeds. Both cases show a similar trend of cage volume reduction with respect to flow speeds as the previous studies. Moreover, the presence of fish had limited the influence on the net volume change. The reduction in speed inside and downstream from the cage was within the range reported in previous literature. Notably, when the cage becomes significantly deformed, it not only reduces flow speed but also alters flow directions, as evidenced by the high variability of flow direction inside the empty cage, particularly at high speeds. The measured flow speed inside the stocked cage also exhibited high variability, but the pattern of variation differed significantly from that of the empty cage, indicating the influence of fish. These findings suggest that traditional flow speed models might oversimplify the flow field in and around fish cages, especially in studies concerning the dispersion of particles, pathogens, and dissolved matter in and out of fish cages.

关键词： fluid-structure interaction ocean space utilization

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An arbitrary Lagrangian-Eulerian method for fluid-structure interactions due to underwater explosions

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INTERNATIONAL JOURNAL OF NUMERICAL METHODS FOR HEAT & fluid FLOW 2023年第6期33卷 2308-2349页

作者： Lohner, Rainald Li, Lingquan Soto, Orlando Antonio Baum, Joseph David George Mason Univ CFD Ctr MS 6A2 Fairfax VA 22030 USA Appl Simulat Inc Mclean VA USA

PurposeThis study aims to evaluate blast loads on and the response of submerged structures. Design/methodology/approachAn arbitrary Lagrangian-Eulerian method is developed to model fluid-structure interaction (FSI) problems of close-in underwater explosions (UNDEX). The "fluid" part provides the loads for the structure considers air, water and high explosive materials. The spatial discretization for the fluid domain is performed with a second-order vertex-based finite volume scheme with a tangent of hyperbola interface capturing technique. The temporal discretization is based on explicit Runge-Kutta methods. The structure is described by a large-deformation Lagrangian formulation and discretized via finite elements. First, one-dimensional test cases are given to show that the numerical method is free of mesh movement effects. Thereafter, three-dimensional FSI problems of close-in UNDEX are studied. Finally, the computation of UNDEX near a ship compartment is performed. FindingsThe difference in the flow mechanisms between rigid targets and deforming targets is quantified and evaluated. Research limitations/implicationsCavitation is modeled only approximately and may require further refinement/modeling. Practical implicationsThe results demonstrate that the proposed numerical method is accurate, robust and versatile for practical use. Social implicationsBetter design of naval infrastructure [such as bridges, ports, etc.]. Originality/valueTo the best of the authors' knowledge, this study has been conducted for the first time.

关键词： UNDEX Vertex centered Arbitrary Lagrangian-Eulerian fluid-structure interaction

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fluid-structure interaction in blood flow capturing non-zero longitudinal structure displacement

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JOURNAL OF COMPUTATIONAL PHYSICS 2013年 235卷 515-541页

作者： Bukac, Martina Canic, Suncica Glowinski, Roland Tambaca, Josip Quaini, Annalisa Univ Houston Dept Math Houston TX 77204 USA Univ Paris 06 Lab Jacques Louis Lions F-75005 Paris France Univ Zagreb Dept Math Zagreb 10000 Croatia

We present a new model and a novel loosely coupled partitioned numerical scheme modeling fluid-structure interaction (FSI) in blood flow allowing non-zero longitudinal displacement. Arterial walls are modeled by a linearly viscoelastic, cylindrical Koiter shell model capturing both radial and longitudinal displacement. fluid flow is modeled by the Navier-Stokes equations for an incompressible, viscous fluid. The two are fully coupled via kinematic and dynamic coupling conditions. Our numerical scheme is based on a new modified Lie operator splitting that decouples the fluid and structure sub-problems in a way that leads to a loosely coupled scheme which is unconditionally stable. This was achieved by a clever use of the kinematic coupling condition at the fluid and structure sub-problems, leading to an implicit coupling between the fluid and structure velocities. The proposed scheme is a modification of the recently introduced "kinematically coupled scheme" for which the newly proposed modified Lie splitting significantly increases the accuracy. The performance and accuracy of the scheme were studied on a couple of instructive examples including a comparison with a monolithic scheme. It was shown that the accuracy of our scheme was comparable to that of the monolithic scheme, while our scheme retains all the main advantages of partitioned schemes, such as modularity, simple implementation, and low computational costs. (C) 2012 Elsevier Inc. All rights reserved.

关键词： fluid-structure interaction Loosely coupled scheme Blood flow

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Network-theoretic modeling of fluid-structure interactions

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THEORETICAL AND COMPUTATIONAL fluid DYNAMICS 2023年第5期37卷 707-723页

作者： Nair, Aditya G. Douglass, Samuel B. Arya, Nitish Univ Nevada Dept Mech Engn 1664 N Virginia St Reno NV 89557 USA

The coupling interactions between deformable structures and unsteady fluid flows occur across a wide range of spatial and temporal scales in many engineering applications. These fluid-structure interactions (FSI) pose significant challenges in accurately predicting flow physics. In the present work, two multi-layer network approaches are proposed that characterize the interactions between the fluid and structural layers for an incompressible laminar flow over a two-dimensional compliant flat plate at a 35 degrees angle of attack. In the first approach, the network nodes are formed by wake vortices and bound vortexlets, and the edges of the network are defined by the induced velocity between these elements. In the second approach, coherent structures (fluid modes), contributing to the kinetic energy of the flow, and structural modes, contributing to the kinetic energy of the compliant structure, constitute the network nodes. The energy transfers between the modes are extracted using a perturbation approach. Furthermore, the network structure of the FSI system is simplified using the community detection algorithm in the vortical approach and by selecting dominant modes in the modal approach. Network measures are used to reveal the temporal behavior of the individual nodes within the simplified FSI system. Predictive models are then built using both data-driven and physics-based methods. Overall, thiswork sets the foundation for network-theoretic reduced-order modeling of fluid-structure interactions, generalizable to other multi-physics systems.

关键词： fluid-structure interaction Reduced-order modeling Vortex dynamics Data-based methods

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fluid-structure interaction analysis of non-Darcian effects on natural convection in a porous enclosure

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INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER 2013年第1-2期58卷 382-394页

作者： Khanafer, KhaIil Univ Michigan Dept Biomed Engn Vasc Mech Lab Ann Arbor MI 48109 USA Univ Michigan Dept Surg Vasc Surg Sect Ann Arbor MI 48109 USA

Non-Darcian effects on natural convective flow and heat transfer in a square enclosure filled with a porous medium was analyzed numerically using fluid-structure interaction (FSI) model. The transport equations were solved for various pertinent parameters using a finite element formulation based on the Galerkin method of weighted residuals. Such parameters included Rayleigh number, porosity, elasticity of the flexible wall, and the effective thermal conductivity of the porous medium. Further, the fluid domain was described by an Arbitrary-Lagrangian-Eulerian (ALE) formulation that is fully coupled to the structure domain. Different flow models for porous media such as Darcy's law model and Darcy-Forchheimer model were considered in this investigation. Comparisons of isotherms, streamlines, and average Nusselt number are made between rigid and FSI models. The results of this investigation showed that Rayleigh number and the elasticity of the flexible wall had a profound effect on the shape of the flexible wall and consequently on the heat transfer enhancement within the enclosure. (C) 2012 Elsevier Ltd. All rights reserved.

关键词： Elasticity fluid-structure interaction Natural convection Non-Darcian effects

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fluid-structure interaction Simulations of a Tension-Cone Inflatable Aerodynamic Decelerator

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AIAA JOURNAL 2013年第7期51卷 1640-1656页

作者： Kramer, R. M. J. Cirak, F. Pantano, C. Univ Illinois Dept Mech Sci & Engn Urbana IL 61801 USA Univ Cambridge Dept Engn Cambridge CB2 1PZ England

A series of fluid structure interaction simulations of an aerodynamic tension-cone supersonic decelerator prototype intended for large mass payload deployment in planetary explorations are discussed. The fluid-structure interaction computations combine large deformation analysis of thin shells with large-eddy simulation of compressible turbulent flows using a loosely coupled approach to enable quantification of the dynamics of the vehicle. The simulation results are compared with experiments carried out at the NASA Glenn Research Center. Reasonably good agreement between the simulations and the experiment is observed throughout a deflation cycle. The simulations help to illuminate the details of the dynamic progressive buckling of the tension-cone decelerator that ultimately results in the collapse of the structure as the inflation pressure is decreased. Furthermore, the tension-cone decelerator exhibits a transient oscillatory behavior under impulsive loading that ultimately dies out. The frequency of these oscillations was determined to be related to the acoustic time scale in the compressed subsonic region between the bow shock and the structure. As shown, when the natural frequency of the structure and the frequency of the compressed subsonic region approximately match, the decelerator exhibits relatively large nonaxisymetric oscillations. The observed response appears to be a fluid structure interaction resonance resulting from an acoustic chamber (pistonlike) mode exciting the structure.

关键词： fluid structure RESEARCH fluidS -- Properties fluid-structure interaction AERODYNAMICS -- Research HYDRODYNAMICS

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fluid-structure interaction, immersed boundary-finite element method simulations of bio-prosthetic heart valves

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COMPUTER METHODS IN APPLIED MECHANICS AND ENGINEERING 2013年第Apr.15期257卷 103-116页

作者： Borazjani, Iman SUNY Buffalo Dept Mech & Aerosp Engn Buffalo NY 14260 USA

A three-dimensional fluid-structure interaction (FSI) framework for rigid bodies has been extended to deformable soft tissue by coupling a sharp-interface immersed boundary incompressible Navier-Stokes solver for fluids with a non-linear large deformation finite element method for soft tissue. A Fung-type constitutive law is used for the soft tissue of heart valves that can capture the experimentally observed non-linear anisotropic stress-strain behavior of the heart valve tissue. The FSI solver adopts a strongly-coupled partitioned approach that is stabilized with under-relaxation and the Aitken acceleration technique. The finite element solver is verified against the benchmark experimental and numerical data for heart valve tissue while the immersed boundary solver was validated against flow measurements of a mechanical heart valve in the previous work. The capabilities of the solver are demonstrated by simulating the first fully three-dimensional fluid-structure interaction of tissue valves implanted in the aortic position during systole under physiologic flow conditions. It is observed that the flow's threefold symmetry breaks during the early systole, questioning the threefold symmetry assumption of previous simulations. The flow created by the tissue valve is compared against the mechanical heart valve under the same conditions. The flowfields, created by the tissue and mechanical valves, show drastic differences at different instances during a heartbeat cycle. Mainly, the breakdown of vortices into small-scale vortical structures right before the peak systole in mechanical heart valves is not observed in the bio-prosthetic heart valves. (C) 2013 Elsevier B.V. All rights reserved.

关键词： fluid-structure interaction Finite element method Immersed boundary method Heart valve

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fluid-structure interaction modeling of clusters of spacecraft parachutes with modified geometric porosity

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COMPUTATIONAL MECHANICS 2013年第6期52卷 1351-1364页

作者： Takizawa, Kenji Tezduyar, Tayfun E. Boben, Joseph Kostov, Nikolay Boswell, Cody Buscher, Austin Waseda Univ Inst Adv Study Dept Modern Mech Engn & Waseda Shinjuku Ku Tokyo 1698050 Japan Rice Univ Dept Mech Engn Houston TX 77005 USA

To increase aerodynamic performance, the geometric porosity of a ringsail spacecraft parachute canopy is sometimes increased, beyond the "rings" and "sails" with hundreds of "ring gaps" and "sail slits." This creates extra computational challenges for fluid-structure interaction (FSI) modeling of clusters of such parachutes, beyond those created by the lightness of the canopy structure, geometric complexities of hundreds of gaps and slits, and the contact between the parachutes of the cluster. In FSI computation of parachutes with such "modified geometric porosity," the flow through the "windows" created by the removal of the panels and the wider gaps created by the removal of the sails cannot be accurately modeled with the Homogenized Modeling of Geometric Porosity (HMGP), which was introduced to deal with the hundreds of gaps and slits. The flow needs to be actually resolved. All these computational challenges need to be addressed simultaneously in FSI modeling of clusters of spacecraft parachutes with modified geometric porosity. The core numerical technology is the Stabilized Space-Time FSI (SSTFSI) technique, and the contact between the parachutes is handled with the Surface-Edge-Node Contact Tracking (SENCT) technique. In the computations reported here, in addition to the SSTFSI and SENCT techniques and HMGP, we use the special techniques we have developed for removing the numerical spinning component of the parachute motion and for restoring the mesh integrity without a remesh. We present results for 2- and 3-parachute clusters with two different payload models.

关键词： fluid-structure interaction Parachutes Space-time techniques Ringsail parachutes Parachute clusters Contact Modified geometric porosity

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fluid-structure interaction simulation of pulsatile ventricular assist devices

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COMPUTATIONAL MECHANICS 2013年第5期52卷 971-981页

作者： Long, C. C. Marsden, A. L. Bazilevs, Y. Univ Calif San Diego San Diego CA 92093 USA

In this paper we present a collection of fluid-structure interaction (FSI) computational techniques that enable realistic simulation of pulsatile Ventricular Assist Devices (VADs). The simulations involve dynamic interaction of air, blood, and a thin membrane separating the two fluids. The computational challenges addressed in this work include large, buckling motions of the membrane, the need for periodic remeshing of the fluid mechanics domain, and the necessity to employ tightly coupled FSI solution strategies due to the very strong added mass effect present in the problem. FSI simulation of a pulsatile VAD at realistic operating conditions is presented for the first time. The FSI methods prove to be robust, and may be employed in the assessment of current, and the development of future, pulsatile VAD designs.

关键词： Pulsatile VAD fluid-structure interaction Isogeometric analysis Biomechanics Finite elements Blood flow Rotation-free shells

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