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Efficient semi-implicit coupling fluid-structure interaction analysis via model-order reduction of dynamic grids

AEROSPACE SCIENCE AND TECHNOLOGY 2022年第0期121卷 107356-107356页

作者： Cho, Haeseong Jeonbuk Natl Univ Dept Aerosp Engn 567 Baekje Daero Jeonju Si 54896 Jeollabuk Do South Korea

In this paper, a fluid-structure interaction (FSI) using the model-order reduction (MOR) of dynamic grids is proposed. Within the interface problem between the fluid and the structure, the grid deformation is based on the spring analogy, and it is further extended in order for the efficient computation. In this procedure, the projection-based MOR technique is employed. The relevant MOR technique is realized by using the proper orthogonal decomposition and the discrete empirical interpolation method (POD/DEIM). The resulting FSI framework is based on a semi-implicit coupling approach. In order to achieve this, a characteristic-based split (CBS) scheme is used for an arbitrary Lagrangian-Eulerian (ALE) formulation of the two-dimensional Navier-Stokes equation. Also, a structural analysis is based on the co rotational (CR) formulation in order to simulate the geometrically nonlinear behavior. Both the fluid and structural analyses are combined with the semi-implicit coupling approach, and the relevant algorithm is embedded in the ALE/CBS scheme. Then, the present FSI analysis is verified using three examples, and the computational efficiency is evaluated. The resulting numerical data demonstrated the validity of the present analysis, and it is found that a significant reduction in the computational cost is possibly achieved with the proposed approach. (c) 2022 The Author(s). Published by Elsevier Masson SAS. This is an open access article under the CC BY-NC-ND license (http://***/licenses/by-nc-nd/4.0/).

关键词： fluid-structure interaction Dynamic girds Proper orthogonal decomposition (POD) Semi-implicit coupling Discrete empirical interpolation method (DEIM)

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Surrogate-based acceleration of quasi-Newton techniques for fluid-structure interaction simulations

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COMPUTERS & structureS 2022年 260卷 106720-106720页

作者： Delaisse, Nicolas Demeester, Toon Fauconnier, Dieter Degroote, Joris Univ Ghent Dept Electromech Syst & Met Engn Sint Pietersnieuwstr 41 B-9000 Ghent Belgium Univ Ghent Dept Electromech Syst & Met Engn Soete Lab Zwijnaarde 46 B-9052 Zwijnaarde Belgium Flanders Make UGent Core Lab EEDT MP Ghent Belgium

Quasi-Newton methods have proven to be an efficient way to couple partitioned solvers in fluid-structure interaction problems, as they are able to stabilize cases with high added-mass, as well as accelerate the convergence. However, these methods assume that the coupled system is a complete black-box, whereas often, its behavior is well approximated by a surrogate model. Such a model may be obtained by coarsening the system, simplifying the physics, reverting to analytical approximations or considering the system at a previous point in time. The principal idea of this work is to use an initial solution and a Jacobian provided by the surrogate model, to expedite the convergence even further. This article presents a new framework for the inclusion of surrogate models in quasi-Newton methods and positions several existing methods with respect to it. (C) 2021 Elsevier Ltd. All rights reserved.

关键词： fluid-structure interaction Quasi-Newton method Surrogate model Partitioned algorithm

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A comprehensive assessment of accuracy of adaptive integration of cut cells for laminar fluid-structure interaction problems

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COMPUTERS & MATHEMATICS WITH APPLICATIONS 2022年 122卷 1-18页

作者： Kadapa, Chennakesava Wang, Xinyu Mei, Yue Univ Bolton Sch Engn Bolton BL3 5AB England Dalian Univ Technol Dept Engn Mech Dalian Peoples R China

Finite element methods based on cut-cells are becoming increasingly popular because of their advantages over formulations based on body-fitted meshes for problems with moving interfaces. In such methods, the cells (or elements) which are cut by the interface between two different domains need to be integrated using special techniques in order to obtain optimal convergence rates and accurate fluxes across the interface. The adaptive integration technique in which the cells are recursively subdivided is one of the popular techniques for the numerical integration of cut-cells due to its advantages over tessellation, particularly for problems involving complex geometries in three dimensions. Although adaptive integration does not impose any limitations on the representation of the geometry of immersed solids as it requires only point location algorithms, it becomes computationally expensive for recovering optimal convergence rates. This paper presents a comprehensive assessment of the adaptive integration of cut-cells for applications in computational fluid dynamics and fluid -structure interaction. We assess the effect of the accuracy of integration of cut cells on convergence rates in velocity and pressure fields, and then on forces and displacements for fluid-structure interaction problems by studying several examples in two and three dimensions. By taking the computational cost and the accuracy of forces and displacements into account, we demonstrate that numerical results of acceptable accuracy for FSI problems involving laminar flows can be obtained with only fewer levels of refinement. In particular, we show that three levels of adaptive refinement are sufficient for obtaining force and displacement values of acceptable accuracy for laminar fluid-structure interaction problems.

关键词： Incompressible Navier-Stokes Immersed boundary methods fluid-structure interaction CutFEM Adaptive integration Flow-induced vibrations

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An immersed interface methodology for simulating supersonic spacecraft parachutes with fluid-structure interaction

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JOURNAL OF fluidS AND structureS 2022年第0期114卷

作者： Boustani, Jonathan Barad, Michael F. Kiris, Cetin C. Brehm, Christoph Univ Kentucky Dept Mech Engn Lexington KY 40506 USA NASA Computat Aerosci Branch Ames Res Ctr Moffett Field CA 94035 USA Univ Maryland Dept Aerosp Engn College Pk MD 20740 USA

The capability of a computational fluid-structure interaction method for simulating thin shell structures with an immersed boundary method and a nonlinear structural dynamics solver is extended in order to simulate supersonic spacecraft parachutes. Methodologies for the representation and motion tracking of thin, sub-grid resolution, thickness Lagrangian geometries in a static Eulerian background mesh are presented in detail. Logical functions for constructing reliable near-wall finite difference operators in the presence of thin geometries and trapped/concave volumes of space are presented. The Darcy-Forchheimer momentum equation is solved as a jump condition at the immersed interface in order to model the porosity of parachute broadcloth. A parallel contact identification and enforcement strategy based on first principles is introduced and validated. The coupled method is then used to simulate wind tunnel experiments conducted to support the Mars Science Laboratory (MSL) mission. In these experiments, a sub-scale MSL disk-gap-band parachute is inflated in a range of Mach numbers and dynamic pressures. The computational method shows good agreement with the experimental data, and where available, other simulation and empirical data, in terms of the opening load magnitude at various Mach numbers and the sustained aerodynamic performance measured by the coefficient of drag. Following quantitative comparison, a qualitative analysis is performed to investigate the effect of freestream Mach number, material porosity, and the bluff upstream payload on the main flow features. (C) 2022 Elsevier Ltd. All rights reserved.

关键词： Immersed interface method Higher-order finite difference methods Cartesian grid methods Porosity modeling fluid-structure interaction Spacecraft parachutes

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A monolithic one-velocity-field optimal control formulation for fluid-structure interaction problems with large solid deformation

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JOURNAL OF fluidS AND structureS 2022年 111卷

作者： Wang, Yongxing Univ Leeds Sch Comp Leeds England

In this article, we formulate a monolithic optimal control method for general timedependent fluid-structure interaction (FSI) systems with large solid deformation: we consider a displacement-tracking type of objective with a constraint of the solid velocity, and tackle the time-dependent control problems by a piecewise-in-time control method;we cope with the large solid displacement using a one-velocity fictitious domain method, and solve the fully-coupled FSI and the corresponding adjoint equations in a monolithic manner. The proposed method is implemented in open-source software package FreeFEM++ and assessed by three numerical experiments, in the aspects of stability of the numerical scheme for different regularisation parameters, and efficiency of reducing the objective function with control of the solid velocity. (c) 2022 Elsevier Ltd. All rights reserved.

关键词： fluid-structure interaction Optimal control Piecewise control Monolithic method One-velocity method

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On the interface matrix for fluid-structure interaction problems with fictitious domain approach

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COMPUTER METHODS IN APPLIED MECHANICS AND ENGINEERING 2022年第PartB期401卷 1页

作者： Boffi, Daniele Credali, Fabio Gastaldi, Lucia King Abdullah Univ Sci & Technol Comp Elect & Math Sci & Engn Div Thuwal 23955 Saudi Arabia Univ Pavia Dipartimento Matemat F Casorati Via Ferrata 1 I-27100 Pavia Italy Univ Brescia Dipartimento Ingn Civile Architettura Terr Territo via Branze 43 I-25123 Brescia Italy

We study a recent formulation for fluid-structure interaction problems based on the use of a distributed Lagrange multiplier in the spirit of the fictitious domain approach. In this paper, we focus our attention on a crucial computational aspect regarding the interface matrix for the finite element discretization: it involves integration of functions supported on two different meshes. Several numerical tests show that accurate computation of the interface matrix has to be performed in order to ensure the optimal convergence of the method. (c) 2022 Elsevier B.V. All rights reserved.

关键词： fluid-structure interaction Fictitious domain Non -matching grids Mesh intersection

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A fluid-structure interaction analysis of design factor of subsurface irrigation PC dripper

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JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY 2022年第7期36卷 3469-3475页

作者： Kang, Woong Bhin Kim, Jeongsik Mo, Hyeonguk Eum, Dukho Lee, Sanghun Kim, Jinhyun Kim, Seolha Kyungpook Natl Univ Dept Precis Mech Engn Sangju 37224 South Korea Kyungpook Natl Univ Young Engn Educ Program Multidisciplinary Smart D Sangju 37224 South Korea Namkyung Co Ltd Hwaseong 18626 South Korea Rural Dev Adm Natl Inst Crop Sci Dept Southern Area Crop Sci Miryang 50424 South Korea

A subsurface drip irrigation system delivers water and nutrients directly to the plant root zone;other conventional nozzles-type or sprinklers-type irrigation are not used, and water-saving can reach 42-78%. In order to achieve this impact effectively, the drip irrigation requires a constant water supply under variations in pressure, which is so-called pressure compensating (PC) performance. The pressure compensating feature can be obtained by physical interaction between water flow and deformable silicone rubber in the PC dripper. In addition, pressure condition to ensure uniform water flow as a tresholding point also should be well designed, but it is generally have relied on the empiricial optimization. Here, we applied computational fluid dynamics to investigate water flow features in terms of flow rate and pressure drop of a conventional PC dripper. To understand the quantitative effects of changes in design parameters, we explored the fluid-structure interaction scheme in the CFD analysis between water flow and silicone rubber deformation. In this study, it is found that the marginal space for the silicone rubber deformation determined the threshold pressure condition;the friction condition of the tortuous channel of the dripper controlled the flow rate. This parametric study gave the logical insight to design new drip emitter with well-controlled and improved performance.

关键词： Computational fluid dynamics Dripper design factors fluid-structure interaction Pressure compensation Surface irrigation

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The pathogenesis of superior mesenteric artery dissection: An in-depth study based on fluid-structure interaction and histology analysis

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COMPUTER METHODS AND PROGRAMS IN BIOMEDICINE 2022年 226卷 107187-107187页

作者： Jia, Zhongzhi Mei, Junhao Ding, Wei Zhao, Xi Gong, Wen Yu, Haiyang Qin, Lihao Piao, Zeyu Chen, Wenhua Tang, Liming Nanjing Med Univ Affiliated Changzhou Peoples Hosp 2 Dept Intervent & Vasc Surg Changzhou 213003 Peoples R China Nanjing Med Univ Affiliated Wuxi Peoples Hosp Dept Intervent Radiol Wuxi 214023 Peoples R China United Imaging Healthcare Cent Res Inst Shanghai 201807 Peoples R China Nanjing Med Univ Affiliated Changzhou Peoples Hosp 2 Dept Pathol Changzhou 213003 Peoples R China Soochow Univ Affiliated Hosp 3 Dept Intervent Radiol Changzhou 213000 Peoples R China Nanjing Med Univ Affiliated Changzhou Peoples Hosp 2 Dept Gastrointestinal Surg Changzhou 213003 Peoples R China

Objective: To explore the role of hemodynamic factors in the occurrence of superior mesenteric artery (SMA) dissection (SMAD) using a fluid-structure interaction (FSI) simulation method, and to identify histopathologic changes occurring in the wall of the SMA. Methods: A total of 122 consecutive patients diagnosed with SMAD and 122 controls were included in this study. Hemodynamic factors were calculated using a FSI simulation method. Additionally, SMA spec-imens obtained from 12 cadavers were stained for histological quantitative ***: The mean aortomesenteric angle (59.7 degrees +/- 21.4 degrees vs 48.2 degrees +/- 16.8 degrees;p < .001) and SMA maximum curvature (0.084 +/- 0.078 mm-1 vs 0.032 +/- 0.023 mm -1;p < .001) were higher in SMAD patients than the controls. Larger aortomesenteric angles and SMA curvatures were associated with higher and more concentrated wall shear stress at anterior wall of the SMA curve segment, co-located with the dissec-tion origins. The mean thickness of media (325.18 +/- 44.87 mu m vs 556.92 +/- 138.32 mu m;p = .003) was thinner in the anterior wall of the SMA curve than in the posterior wall. The area fractions of elastin (17.96% +/- 3.36% vs 27.06% +/- 4.18%;p = .002) and collagen (45.43% +/- 6.89% vs 55.57% +/- 7.57%;p = .036) were lower in anterior wall of the SMA curve than in posterior ***: Increased aortomesenteric angle and SMA curvature are risk factors for SMAD. Both of these factors can cause local hemodynamic abnormalities, which can lead to histopathologic changes in anterior wall of SMA.(c) 2022 The Authors. Published 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： Mesenteric artery Dissection fluid-structure interaction Computed tomography arteriography

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Efficient split-step schemes for fluid-structure interaction involving incompressible generalised Newtonian flows

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COMPUTERS & structureS 2022年 260卷 106718-106718页

作者： Schussnig, Richard Pacheco, Douglas R. Q. Fries, Thomas-Peter Graz Univ Technol Inst Struct Anal Lessingstr 25-2 A-8010 Graz Austria Graz Univ Technol Graz Ctr Computat Engn Krenngasse 37-1 A-8010 Graz Austria Graz Univ Technol Inst Appl Math Steyrergasse 30-3 A-8010 Graz Austria

Blood flow, dam or ship construction and numerous other problems in biomedical and general engineering involve incompressible flows interacting with elastic structures. Such interactions heavily influence the deformation and stress states which, in turn, affect the engineering design process. Therefore, any reliable model of such physical processes must consider the coupling of fluids and solids. However, complexity increases for non-Newtonian fluid models, as used, e.g., for blood or polymer flows. In these fluids, subtle differences in the local shear rate can have a drastic impact on the flow and hence on the coupled problem. There, existing (semi-) implicit solution strategies based on split-step or projection schemes for Newtonian fluids are not applicable, while extensions to non-Newtonian fluids can lead to substantial numerical overhead depending on the chosen fluid solver. To address these shortcomings, we present here a higher-order accurate, added-mass-stable fluid-structure interaction scheme centered around a split-step fluid solver. We compare several implicit and semi-implicit variants of the algorithm and verify convergence in space and time. Numerical examples show good performance in both benchmarks and an idealised setting of blood flow through an abdominal aortic aneurysm considering physiological parameters. (C) 2021 The Author(s). Published by Elsevier Ltd.

关键词： fluid-structure interaction Non-Newtonian fluid Split-step scheme Time-splitting method Semi-implicit coupling Incompressible flow

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Experimental and computational fluid-structure interaction analysis and optimization of deep-V planing-hull grillage panels subject to slamming loads - Part I: Regular waves

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MARINE structureS 2022年第0期85卷

作者： Diez, Matteo Lee, Evan J. Harrison, Emily L. Powers, Ann Marie R. Snyder, Lawrence A. Jiang, Minyee J. Bay, Raymond J. Lewis, Richard R. Kubina, Eric R. Mucha, Philipp Stern, Frederick Inst Marine Engn CNR INM Natl Res Council Rome Italy Naval Surface Warfare Ctr Carderock Div NSWCCD Bethesda MD USA Siemens Digital Ind Software Inc Torrance CA USA Univ Iowa IIHR Hydrosci & Engn Iowa City IA USA

The paper presents the multidisciplinary design optimization (MDO) of a deep-V planing-hull grillage panel subject to slamming loads in regular waves. Namely, fluid structure interaction (FSI) experiments, computations, and MDO are presented and discussed for a bottom-panel grillage of a high-speed Generic Prismatic Planing Hull in regular waves. Computations are per-formed via one-and tightly coupled two-way computational fluid and structural dynamics (CFD/ CSD) using unsteady Reynolds-averaged Navier-Stokes equation solvers to compute the hydro-dynamic loads. The structural assessment of the original/traditional grillage is performed using a fully parametric finite element (FE) model, showing the significant effects of the FE boundary conditions on the structural response. Firstly, an equivalent static and uniform load is identified via CFD and applied during optimization using two design spaces. The selected optimized design provides a grillage-weight reduction of 35% and an overall factor of safety equal to 1.72. The optimized design presents variations of stiffeners dimensions across the grillage with the largest stiffener at the middle, distributing the stress more uniformly among the stiffeners. The effects of one-versus two-way coupling are negligible for both the original/traditional and optimized grillages (as per the hydroelasticity factor R), whereas the effects of FE boundary conditions on the analysis and optimization outcomes are significant, confirming the need for proper calibration of the FE model in FSI and MDO studies. Secondly, MDO is performed with a dynamic load applied via one-way coupling FSI. An additional 5% weight reduction is identified, achieving a 40% weight reduction compared to the traditional grillage. The optimal design presents the largest stiffener close to the keel, which is significantly different than the design obtained for uniform/static load. Comparison of computational and experimental data is very good, indicating that th

关键词： fluid-structure interaction Slamming Planing hulls Grillage panels Multidisciplinary design optimization Validation

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