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A classification of interface treatments for FSI 1

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1st International Workshop on computational engineering - Fluid-Structure Interactions, FSI 2009

作者： Felippa, C.A. Park, K.C. Ross, M.R. Department of Aerospace Engineering Sciences Center for Aerospace Structures University of Colorado at Boulder Boulder CO 80309-0429 United States Analytical Dynamics Department Sandia National Laboratories MS 0346 P. O. Box 5800 Albuquerque NM 87185-0346 United States

ISBN: (数字)9783642142062

ISBN: (纸本)9783642142055

This paper proposes a taxonomy of methods for the treatment of the fluid-structure interface in FSI coupled problems. The top-level classification is based on the presence or absence of Additional Interface Variables (AIV) as well as their type. Associated prototype methods: Direct Force Motion Transfer (DFMT), Mortar and Localized Lagrange Multipliers (LLM) are defined. These are later studied in more detail using a specific FSI benchmark problem used in Ross' 2006 thesis. Desirable attributes of the interfacing methods are stated and commented upon. © 2011 Springer.

关键词： Lagrange multipliers

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Partitioned simulation of fluid-structure interaction on Cartesian grids 1

引用

1st International Workshop on computational engineering - Fluid-Structure Interactions, FSI 2009

作者： Bungartz, H.-J. Benk, J. Gatzhammer, B. Mehl, M. Neckel, T. Department of Computer Science Technische Universität München Boltzmannstr. 3 85748 Garching Germany

ISBN: (数字)9783642142062

ISBN: (纸本)9783642142055

This contribution describes recent developments and enhancements of the coupling tool preCICE and the flow solver Peano used for our partitioned simualtions of fluid-structure interaction scenarios. Peano brings together hardware efficiency and numerical efficiency exploiting advantages of tree-structured adaptive Cartesian computational grids that, in particular, allow for a very memory-efficient implementation of parallel adaptive multilevel solvers - an efficiency which is crucial facing the large computational requirements of multi-physics applications and the recent trend in computer architectures towards multi- and many-core systems. preCICE is the successor of our coupling tool FSIsce and offers a solver-independent implementation of coupling strategies and data mapping functionalities for general multi-physics problems. The underlying client-server-like concept maintains the full flexibilty of the partitioned approach with respect to exchangeability of solvers. The data mapping relies on fast spacepartitioning tree algorithms for the detection of geometric neighbourhood relations between components of non-matching grids. © 2011 Springer.

关键词： Fluid structure interaction

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Hydroelastic analysis and response of pontoon-type very large floating structures 1

引用

1st International Workshop on computational engineering - Fluid-Structure Interactions, FSI 2009

作者： Wang, C.M. Tay, Z.Y. Centre for Offshore Research and Engineering Department of Civil Engineering National University of Singapore Kent Ridge Singapore 119260 Singapore

ISBN: (数字)9783642142062

ISBN: (纸本)9783642142055

Pontoon-type very large floating structures (VLFS) are giant plates resting on the sea surface. As these structures have a large surface area and a relatively small depth, they behave elastically under wave action. This type of fluid-structure interaction has being termed hydroelasticity. Hydroelastic analysis is thus necessary to be carried out for VLFS designs in order to assess the dynamic motion and stresses due to wave action. This paper presents the mathematical formulation for the hydroelastic analysis of VLFS. Hydroelastic responses and mitigation methods in reducing the structural response are discussed using some example problems. © 2011 Springer.

关键词： Hydroelasticity

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Numerical simulation of fluid-structure interaction using eddy-resolving schemes 1

引用

1st International Workshop on computational engineering - Fluid-Structure Interactions, FSI 2009

作者： Münsch, M. Breuer, M. Institute of Fluid Mechanics Friedrich-Alexander University Erlangen-Nuremberg Cauerstraße 4 D-91058 Erlangen Germany Department of Fluid Mechanics Institute of Mechanics Helmut-Schmidt-University Hamburg Holstenhofweg 85 D-22043 Hamburg Germany

ISBN: (数字)9783642142062

ISBN: (纸本)9783642142055

Eddy-resolving schemes such as large-eddy simulation (LES) or detached-eddy simulation (DES) have become popular due to their favorable capabilities of predicting complex turbulent flows. That is especially true for instantaneous flow processes involving large-scale flow structures such as separation, reattachment and vortex shedding. Flow phenomena of such kind are very often encountered when the flow around or through a device enforces the structures to be deformed or displaced, i.e. for fluid-structure interaction (FSI). The present study deals with several aspects which have to be taken into account when LES is married to FSI. That comprises the coupling scheme, the handling of moving or deformable grids and the question how their quality requirements can be achieved. A coupling scheme leading to strong coupling among flow and structure, but also maintaining the advantageous properties of explicit time-marching schemes used for LES, was set up and analyzed. Thus a new and favorable coupling procedure for FSI within the LES context was developed. This and other issues of the numerical methods applied such as the measures to maintain the grid quality are discussed in detail. Results of validation test cases of FSI in the context of rigid body motions (e.g. an elastically mounted cylinder or a swiveling flat plate) as well as benchmark results with flexible structures computed with a finite-element code are presented. © 2011 Springer.

关键词： Large eddy simulation

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An adaptive finite element method for fluid-structure interaction problems based on a fully Eulerian formulation 1

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1st International Workshop on computational engineering - Fluid-Structure Interactions, FSI 2009

作者： Rannacher, R. Richter, T. Institute of Applied Mathematics University of Heidelberg Heidelberg Germany

ISBN: (数字)9783642142062

ISBN: (纸本)9783642142055

In this article, we continue the investigation of the general variational framework for the adaptive finite element approximation of fluid-structure interaction problems proposed in Dunne [12] and Dunne & Rannacher [13]. The modeling is based on an Eulerian description of the (incompressible) fluid as well as the (elastic) structure dynamics. This approach uses a technique which is similar to the Level Set method in the simulation of two-phase flows in so far that it also tracks initial data and from this determines to which "phase" a point belongs. The advantage is that, in contrast to the common ALE approach, the computation takes place on fixed, though dynamically adapted, reference meshes what avoids the critical degeneration in case of large deformation or boundary contact of the structure. Based on this monolithic model of the fluid-structure interaction, we apply the Dual Weighted Residual (DWR) Method for goal-oriented a posteriori error estimation and mesh adaptation to fluid-structure interaction problems. Several test examples are presented in order to illustrate the potential of this approach. © 2011 Springer.

关键词： Fluid structure interaction

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Numerical benchmarking of fluid-structure interaction: A comparison of different discretization and solution approaches 1

引用

1st International Workshop on computational engineering - Fluid-Structure Interactions, FSI 2009

作者： Turek, S. Hron, J. Razzaq, M. Wobker, H. Schäfer, M. Institut für Angewandte Mathematik LS III TU Dortmund Vogelpothsweg 87 44227 Dortmund Germany Institut für Numerische Berechnungsverfahren Im Maschinenbau TU Darmstadt Dolivostr. 15 64293 Darmstadt Germany

ISBN: (数字)9783642142062

ISBN: (纸本)9783642142055

Comparative benchmark results for different solution methods for fluid-structure interaction problems are given which have been developed as collaborative project in the DFG Research Unit 493. The configuration consists of a laminar incompressible channel flow around an elastic object. Based on this benchmark configuration the numerical behavior of different approaches is analyzed exemplarily. The methods considered range from decoupled approaches which combine Lattice Boltzmann methods with hp-FEM techniques, up to strongly coupled and even fully monolithic approaches which treat the fluid and structure simultaneously. © 2011 Springer.

关键词： Fluid structure interaction

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Computer modeling and analysis of the Orion spacecraft parachutes 1

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1st International Workshop on computational engineering - Fluid-Structure Interactions, FSI 2009

作者： Takizawa, K. Moorman, C. Wright, S. Tezduyar, T.E. Mechanical Engineering Rice University 6100 Main Street Houston TX 77005 United States

ISBN: (数字)9783642142062

ISBN: (纸本)9783642142055

We focus on fluid-structure interaction (FSI) modeling of the ringsail parachutes to be used with the Orion spacecraft. The geometric porosity of the ringsail parachutes with ring gaps and sail slits is one of the major computational challenges involved in FSI modeling. We address the computational challenges with the latest techniques developed by the Team for Advanced Flow Simulation and Modeling (T Black star AFSM) in conjunction with the Stabilized Space-Time Fluid-Structure Interaction (SSTFSI) technique. We investigate the performance of the three possible design configurations of the parachute canopy, carry out parametric studies on using an over-inflation control line (OICL) intended for enhancing the parachute performance, discuss rotational periodicity techniques for improving the geometric-porosity modeling and for computing good starting conditions for parachute clusters, and report results from preliminary FSI computations for parachute clusters. We also present a stability and accuracy analysis for the Deforming-Spatial-Domain/Stabilized Space-Time (DSD/SST) formulation, which is the core numerical technology of the SSTFSI technique. © 2011 Springer.

关键词： Fluid structure interaction

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Fluid-structure interaction in the context of shape optimization and computational wind engineering 1

引用

1st International Workshop on computational engineering - Fluid-Structure Interactions, FSI 2009

作者： Hojjat, M. Stavropoulou, E. Gallinger, T. Israel, U. Wüchner, R. Bletzinger, K.-U. Lehrstuhl für Statik Technische Universität München München Germany

ISBN: (数字)9783642142062

ISBN: (纸本)9783642142055

Within this contribution, an integrated concept for the shape optimal design of light-weight and thin-walled structures like shells and membranes subject to fluid flow is presented. The Nested Analysis and Design approach is followed and a partitioned FSI simulation for the state analysis is embedded. The gained modularity allows for the adaption of the single ingredients to various technical applications by choosing appropriate coupling algorithms for the solution of the coupled problem and the sensitivity analysis as well as different strategies to describe the shapes to be optimized. A non-matching grid capability at the coupling interface supports this flexibility. The focus here is on problems of aeroelasticity in the field of computational Wind engineering. To ensure reliable results, investigations on the correct modeling as well as goal-oriented benchmarking are carried out. Moreover, special emphasis is given to the appropriate combination of different approaches for shape description in establishing the closed design cycle. Finally, the success of the overall solution and optimization strategy is demonstrated with an example of a hybrid, light-weight structure, subject to turbulent wind flow. © 2011 Springer.

关键词： Thin walled structures

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An explicit model for three-dimensional fluid-structure interaction using LBM and p-FEM 1

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1st International Workshop on computational engineering - Fluid-Structure Interactions, FSI 2009

作者： Geller, S. Kollmannsberger, S. Bettah, M. El Krafczyk, M. Scholz, D. Düster, A. Rank, E. Institute for Computational Modeling in Civil Engineering TU Braunschweig Muehlenpfordtstraße 4-5 38106 Braunschweig Germany Computation in Engineering TU München Arcisstraße 21 80333 München Germany Technische Universität Hamburg-Harburg Schwarzenbergstraße 95 C D-21073 Hamburg Germany Department of Ocean Engineering University of Rhode Island Narragansett RI 02882 United States

ISBN: (数字)9783642142062

ISBN: (纸本)9783642142055

An explicit coupling model for the simulation of surface coupled fluid-structure interactions with large structural deflections is introduced. Specifically, the fluid modeled via the Lattice Boltzmann Method (LBM) is coupled to a high-order Finite Element discretization of the structure. The forces and velocities are discretely computed, exchanged and applied at the interface. The low compressibility of the Lattice Boltzmann Method allows for an explicit coupling algorithm. The proposed explicit coupling model turnes out to be accurate, very efficient and stable even for nearly incompressible flows. It was implemented in three software components: VirtualFluids (fluid), AdhoC (structure) and FSIsce (a communication library). The validity of the approach is demonstrated in two dimensions by means of comparing numerical results to measurements of an experiment. This experiment involves a flag-like structure submerged in the laminar flow field of an incompressible fluid where the structure exhibits large, geometrically non-linear, self excited, periodic motions. The methodology is then extended to three dimensions. Its performance is first demonstrated via the computation of a falling sphere in a pipe. The close correspondence of the results obtained by application of the numerical scheme compared to a semi-analytic solution is demonstrated. The proposed explicit coupling model is then extended to a plate in a cross flow. We verify the results by comparing them to results obtained by application of the commercial ALE-Finite Volume-h-FEM Fluid-Structure interaction solver Ansys Multiphysics. Additional examples demonstrate the applicability of the proposed methodology to problems of (arbitrarily) large deformations and of large scale. © 2011 Springer.

关键词： Finite element method

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An XFEM based fixed-grid approach for 3D fluid-structure interaction 1

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1st International Workshop on computational engineering - Fluid-Structure Interactions, FSI 2009

作者： Wall, W.A. Gerstenberger, A. Küttler, U. Mayer, U.M. Institute for Computational Mechanics Technische Universität München Boltzmannstr. 15 85747 Garching Germany

ISBN: (数字)9783642142062

ISBN: (纸本)9783642142055

This paper gives an overview on our recent research activities on a fixed grid fluid-structure interaction scheme that can be applied to the interaction of most general structures with incompressible flow. The developed approach is based on an eXtended Finite Element Method (XFEM) based strategy to allow moving interfaces on fixed Eulerian fluid grids. The enriched Eulerian fluid field and the Lagrangian structural field are partitioned and iteratively coupled using Lagrange multiplier techniques for non-matching grids. The approach allows the simulation of the interaction of thin and bulky structures exhibiting large deformations. Extensions towards automatic adaptivity and fluid boundary layer meshes are sketched and the principle applicability to contact simulations of submerged structures are presented. © 2011 Springer.

关键词： Fluid structure interaction

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