Title: Systematic evaluation of the interface description for fluid–structure interaction simulations using the isogeometric mortar-based mapping
Authors: Apostolatos, Andreas
De Nayer, Guillaume  
Bletzinger, Kai Uwe
Breuer, Michael  
Wüchner, Roland
Language: en_US
Keywords: Universitätsbibliographie;Evaluation 2019
Subject (DDC): DDC - Dewey Decimal Classification::000 Informatik, Wissen, Systeme
DDC - Dewey Decimal Classification::500 Naturwissenschaften
DDC - Dewey Decimal Classification::600 Technik
Issue Date: Apr-2019
Publisher: Elsevier
Document Type: Article
Source: Enthalten in: Journal of fluids and structures. - Orlando, Fla. : Elsevier, 1993. - Online-Ressource. - Bd. 86.2019 (April), Seite 368-399
Journal / Series / Working Paper (HSU): Journal of Fluids and Structures 
Volume: 86
Issue: (April)
Page Start: 368
Page End: 399
Publisher Place: Orlando, Fl
Abstract: 
© 2019 The Authors Within this study the influence of the interface description for partitioned Fluid–Structure Interaction (FSI) simulations is systematically evaluated. In particular, a Non-Uniform Rational B-Spline (NURBS)-based isogeometric mortar method is elaborated which enables the transfer of fields defined on low-order and isogeometric representations of the interface along which the FSI constraints are defined. Moreover, the concept of the Exact Coupling Layer (ECL) using the proposed isogeometric mortar-based mapping method is presented. It allows for smoothing fields that are transferred between two standard low-order surface discretizations applying the exact interface description in terms of NURBS. This is especially important for highly turbulent flows, where the artificial roughness of the low-order faceted FSI interfaces results in spurious flow fields leading to inaccurate FSI solutions. The approach proposed is subsequently compared to the standard mortar-based mapping method for transferring fields between two low-order surface representations (finite volume method for the fluid and finite element method for the structure) and validated on a simple lid-driven cavity FSI benchmark. Then, the physically motivated 3D example of the turbulent flow around a membranous hemisphere (Wood et al., 2016) is considered. Its behavior is predicted by combining the large-eddy simulation technique with the isogeometric analysis to demonstrate the usefulness of the isogeometric mortar-based mapping method for real-world FSI applications. Additionally, the test case of a bluff body significantly deformed in an eigenmode shape of the aforementioned hemisphere is used. For this purpose, both “standard” low-order finite element discretizations and a smooth IGA-based description of the structural surface are considered. This deformation is transferred to the fluid FSI interface and the influence of the interface description on the fluid flow is analyzed. Finally, the computational costs related to the presented methodology are evaluated. The results suggest that the proposed methodology can effectively improve the overall FSI behavior with minimal effort by considering the exact geometry description based on the Computer-Aided Design (CAD) model of the FSI interface.
Organization Units (connected with the publication): Strömungsmechanik 
URL: https://ub.hsu-hh.de/DB=1/XMLPRS=N/PPN?PPN=1662781407
https://api.elsevier.com/content/abstract/scopus_id/85062621222
ISSN: 08899746
DOI: 10.1016/j.jfluidstructs.2019.02.012
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