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Three-Dimensional Fluid-Structure Interaction Case Study on Cubical Fluid Cavity with Flexible Bottom

Journal of Marine Science and Application 2017年第4期16卷 382-394页

作者： Stefano Ghelardi cesare rizzo Diego Villa DITEN - Polo Navale Università degli Studi di Genova via Montallegro Genova 1 I-16145 Italy

In this paper, we report our study on a numerical fluid-structure interaction problem originally presented by Mok et al.(2001) in two dimensions and later studied in three dimensions by Valdés Vazquez(2007), Lombardi(2012), and Trimarchi(2012). We focus on a 3D test case in which we evaluated the sensitivity of several input parameters on the fluid and structural results. In particular, this analysis provides a starting point from which we can look deeper into specific aspects of these simulations and analyze more realistic cases, e.g., in sails design. In this study, using the commercial software ADINATM, we addressed a well-known unsteadiness problem comprising a square box representing the fluid domain with a flexible bottom modeled with structural shell elements. We compared data from previously published work whose authors used the same numerical approach, i.e., a partitioned approach coupling a finite volume solver(for the fluid domain) and a finite element solver(for the solid domain). Specifically, we established several benchmarks and made comparisons with respect to fluid and solid meshes, structural element types, and structural damping, as well as solution algorithms. Moreover, we compared our method with a monolithic finite element solution method. Our comparisons of new and old results provide an outline of best practices for such simulations.

关键词： fluid-structure interaction benchmark finite volume method finite element method partitioned monolithic ADINA^(TM)

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Recent Industrial Developments of Marine Composites Limit States and Design Approaches on Strength

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Journal of Marine Science and Application 2020年第4期19卷 553-566页

作者： Beatrice Barsotti Marco Gaiotti cesare Mario rizzo DITEN Marine Structures Testing LabPolytechnic SchoolUniversity of GenoaVia Montallegro1GenoaItaly

To further exploit the potential of marine composites applications in building ship hulls,offshore structures,and marine equipment and components,design approaches should be improved,facing the challenge of a more comprehensive and explicit assessment of appropriately defined limit *** structure ultimate/limit conditions shall be verified in principle within the whole structural domain and throughout the ship service *** above calls for extended and reliable materials characterization on the one hand and for accurate and wide-ranging procedures in structural *** paper presents an overview of recent industrial developments of marine composites limit states assessments and design approaches,as available in open literature,focusing on pleasure crafts and yachts as well as navy ships and thus showing a starting point to fill the gap in this *** a general introduction about composites characterization techniques,current design practice and rule requirements are briefly *** inter-ply and intra-ply failure modes and corresponding limit states are then presented along with recently proposed assessment ***-dimensional aspects in failure modes and manufacturing methods have been identified as the main factors influencing marine composite *** review highlighted also fire resistance and hybrid joining techniques as significant issues in the use of marine composites.

关键词： Marine composites Navy ships Pleasure crafts Yachts FEM Material characterization Limit state design Ultimate strength

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A Quick and Practical Approach for Concept-design of Submerged Thin-walled Stiffened Cylinders

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Journal of Marine Science and Application 2022年第3期21卷 138-154页

作者： Tatiana Pais Marco Gaiotti cesare Mario rizzo University of Genova Polytechnic SchoolDITENvia MontallegroI-16145 GenovaItaly

Goal based and limit state design is nowadays a well-established approach in many engineering *** construction rules started introducing such concepts since early ***,classification societies’rules do not provide hints on how to verify limit states and to determine the structural layout of submerged thin-walled stiffened cylinders,whose most prominent examples are ***,they generally offer guidance and prescriptive formulations to assess shell plating and stiffening *** marine structures are studied,designed and built up to carry payloads below the sea *** the concept-design stage,the maximum operating depth is the governing hull scantling *** dimensions are determined based on the analysis of operational *** study proposes a practical conceptdesign approach for conceptual submarine design,aimed at obtaining hull structures that maximize the payload capacity in terms of available internal volume by suitably adjusting structural layout and stiffening members’scantling,duly accounting for robustness and construction constraints as well as practical fabrication *** proposed scantling process highlights that there is no need of complex algorithms if sound engineering judgment is applied in setting down rationally the hull scantling problem.A systematic approach based on a computer-coded procedure developed on purpose was effectively implemented and satisfactorily applied in design practice.

关键词： Submarines Hull scantling Concept/preliminary design Limit state design Buckling Optimization Thin-walled cylinders

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