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FLUID-STRUCTURE INTERACTION IN INTERNAL FLOWS: COUPLED NUMERICAL SIMULATION

Fulvio Stella
Department of Mechanical and Aerospace Engineering, Sapienza University of Rome via Eudossiana 18, Rome, 00184, Italy

P. Gaudenzi
Dipartimento di Ingegneria Aerospaziale e Astronautica, Università di Roma "La Sapienza" Via Eudossiana 18-00184 Rome, Italy

M. Giangi
Dipartimento di Meccanica e Aeronautica, Università di Roma “La Sapienza”, Via Eudossiana 18 00184 Rome, Italy

F. Paglia
Dipartimento di Meccanica ed Aeronautica, Università di Roma "La Sapienza", Via Eudossiana 18-00184 Rome, Italy

A. Casata
Dipartimento di Meccanica e Aeronautica, Università di Roma "La Sapienza" Via Eudossiana 18-00184 Rome, Italy

D. Simone
Dipartimento di Meccanica e Aeronautica, Università di Roma "La Sapienza" Via Eudossiana 18-00184 Rome, Italy

Abstract

The present paper is a summary of the activities done by a research group of the University of Rome "La Sapienza" on the subject of Fluid-Structure Interaction (FSI). Both theoretical and numerical studies have been conducted by the research group. Aim of the present work is to describe and discuss a methodology for studying highly deformable structures. Since for this class of problems uncoupled analysis is inappropriate, the coupling between fluid flow (CFD) and structure motion (CSD) is a must. Implementation and numerical simulations have been conducted by means of a technique known in literature as partition treatment technique. This approach has the advantage that each numerical code, CFD and CSD, can be chosen independently. For this reason two different commercial codes have been selected for CFD and CSD: FLUENT and ADINA respectively. A procedure to transfer the interaction effects between the individual components (fluid and structure) has been developed. As example of the methodology implemented, a numerical study of a hot flow through a pipe with a flexible structure inside is presented. The effects that deformation of internal structures has on fluid flow and heat fluxes are investigated varying the Young modulus from 5 MPa to ∞ (undeformable structure). Results show that the heat flux distribution along the structure is highly influenced by the structure deformation. The different positions, assumed by the structures studied, determine different qualitative heat fluxes distributions on the structure, which are not easily predictable. The necessity of fully coupled fluid structure calculation is therefore demonstrated to be a fundamental requirement of the simulation.

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