PSI - Issue 8

ScienceDirect Available online at www.sciencedirect.com Av ilable o line at ww.sciencedire t.com ScienceDirect Structural Integrity Procedia 00 (2016) 000 – 000 Procedia Structu al Integrity 8 (2018) 422–432 Available online at www.sciencedirect.com Structural Integrity Procedia 00 (2017) 000–000 Available online at www.sciencedirect.com Structural Integrity Procedia 00 (2017) 000–000

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2452-3216 © 2016 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of PCF 2016. ∗ Corresponding author. Tel.: + 39 0672597124. E-mail address: biancolini@ing.uniroma2.it 2210-7843 c 2017 The Authors. Published by Elsevier B.V. Peer-revi w under responsibility of the Scientific Committee of AIAS 2017 International Conference on Stress Analysis. ∗ Corresponding author. Tel.: + 39 0672597124. E-mail address: biancolini@ing.uniroma2.it 2210-7843 c 2017 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of AIAS 2017 International Conference on Stress Analysis. * Corresponding author. Tel.: +351 218419991. E-mail address: amd@tecnico.ulisboa.pt 2452-3216 Copyright  2018 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of AIAS 2017 International Conference on Stress Analysis 10.1016/j.prostr.2017.12.042 Fluid structure interaction (FSI) is a very interesting topic, subject of ongoing investigations in the scientific com munity. Given its intrinsic complexity, this multiphysics phenomenon introduces an high level of complication in the analysis methods especially when using an high fidelity approach; for this reason, when possible, the structural analyst often underestimates the pressure variations inside or outside structural domains, substituting the action of the evolving flow with a constant wall loading. In a similar manner the CFD analyst, if acceptable, doesn’t takes into Fluid structure interaction (FSI) is a very interesting topic, subject of ongoing investigations in the scientific com munity. Given its intrinsic complexity, this multiphysics phenomenon introduces an high level of complication in the analysis methods especially when using an high fidelity approach; for this reason, when possible, the structural analyst often underestimates the pressure variations inside or outside structural domains, substituting the action of the evolving flow with a constant wall loading. In a similar manner the CFD analyst, if acceptable, doesn’t takes into XV Portuguese Conference on Fracture, PCF 2016, 10-12 February 2016, Paço de Arcos, Portugal Thermo-mechanical modeling of a high pressure turbine blade of an airplane gas turbine engine P. Brandão a , V. Infante b , A.M. Deus c * a Department of Mechanical Engineering, Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais, 1, 1049-001 Lisboa, Portugal b IDMEC, Department of Mechanical Engineering, Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais, 1, 1049-001 Lisboa, Portugal c CeFEMA, Department of Mechanical Engineering, Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais, 1, 1049-001 Lisboa, Portugal Abstract During their operation, modern aircraft engine components are subjected to increasingly demanding operating conditions, especially the high pressure turbine (HPT) blades. Such conditions cause these parts to undergo different types of time-dependent degradation, one of which is creep. A model using the finite element method (FEM) was developed, in order to be able to predict the creep behaviour of HPT blades. Flight data records (FDR) for a specific aircraft, provided by a commercial aviation company, were used to obtain thermal and mechanical data for three different flight cycles. In order to create the 3D model needed for the FEM analysis, a HPT blade scrap was scanned, and its chemical composition and material properties were obtained. The data that was gathered was fed into the FEM model and different simulations were run, first with a simplified 3D rectangular block shape, in order to better establish the model, and then with the real 3D mesh obtained from the blade scrap. The overall expected behaviour in terms of displacement was observed, in particular at the trailing edge of the blade. Therefore such a model can be useful in the goal of predicting turbine blade life, given a set of FDR data. Copyright © 2018 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of AIAS 2017 Int r ational Conference on Stress A alysis AIAS 2017 International Conference on Stress Analysis, AIAS 2017, 6–9 September 2017, Pisa, Italy Fluid structure interaction analysis: vortex shedding induced vibrations N. Di Domenico a , C. Groth a , A. Wade b , T. Be g c , M.E. Biancolini a, ∗ a Department of Enterprise Engineering - University of Rome Tor Vergata, Via del Politecnico, 1, 00133, Rome, Italy b ANSYS UK Ltd, She ffi eld Business Park, 6 Europa View, She ffi eld, S9 1XH c ANSYS Sweden AB, Vestagatan 2B, 416 64 Go¨ teborg, Sweden Abstract Fluid Structure Interaction (FSI) numerical modelling requires an e ffi cient workflow to properly capture the physics involved. Computational Structural Mechanics (CSM) and Computation Fluid Dynamics (CFD) have to be coupled and at the moment there is a lack of monolithic solvers capable to tackle industrial applications that involves high fidelity models which mesh can be comprised of hundred millions of cells. This paper shows an e ffi cient approach based on standard commercial tools. The FEM solver ANSYS R Mechanical TM is used to extract a given number of eigenmodes. Then the modal shapes are imported in the CFD solver Fluent R using the Add On RBF Morph TM . Updating the modal coordinates it is possible to adapt the shape of the model by taking into account the elasticity of the CFD model. Transient analysis is faced using a time marching solution by updating the shape of the mesh at each time step (weak coupling, evaluated as single DOF systems and integrating modal forces over the CFD grid). Numerical performances and solution accuracy of this approach are analyzed on a practical application (NACA0009 Hydrofoil) for which experimental data are available. A comparison between proposed method and experiment is provided. Transient coupled solver is used for the computation of eigenvalues in water by post processing the free vibration response in calm fluid. c 2017 The Authors. Publi hed by Elsevier B.V. Pe r-review under responsibility of the Scientific Committee of AIAS 2017 International Co ference on Stress Analysis. Keywords: Radial Basis Functions; RBF; Fluid Structure Interaction; FSI; Modal Superposition; Vortex shedding; vibrations AIAS 2017 International Conference on Stress Analysis, AIAS 2017, 6–9 September 2017, Pisa, Italy Fluid structure interaction analysis: vortex shedding induced vibrations N. Di Domenico a , C. Groth a , A. Wade b , T. Berg c , M.E. Biancolini a, ∗ a Department of Enterprise Engineering - University of Rome Tor Vergata, Via del Politecnico, 1, 00133, Rome, Italy b ANSYS UK Ltd, She ffi eld Business Park, 6 Europa View, She ffi eld, S9 1XH c ANSYS Sweden AB, Vestagatan 2B, 416 64 Go¨ teborg, Sweden Abstract Fluid Structure Interac ion (FSI) numerical modelling req ires an e ffi ient workflow to properly capture the physics involved. Computational Structural Mechanics (CSM) and Computation Fluid Dynamics (CFD) have to be coupled and at the moment there is a lack of monolithic solvers capable to tackle industrial applications that involves high fidelity models which mesh can be comprised of hundred millions of cells. This paper shows an e ffi cient approach based on standard commercial tools. The FEM solver ANSYS R Mechanical TM is used to extract a given number of eigenmodes. Then the modal shapes are imported in the CFD solver Fluent R using the Add On RBF Morph TM . Updating the modal coordinates it is possible to adapt the shape of the model by taking into account the elasticity of the CFD model. Transient analysis is faced using a time marching solution by updating the shape of the mesh at each time step (weak coupling, evaluated as single DOF systems and integrating modal forces over the CFD grid). Numerical performances and solution accuracy of this approach are analyzed on a practical application (NACA0009 Hydrofoil) for which experimental data are available. A comparison between proposed method and experiment is provided. Transient coupled solver is used for the computation of eigenvalues in water by post processing the free vibration response in calm fluid. c 2017 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of AIAS 2017 International Conference on Stress Analysis. Keywords: Radial Basis Functions; RBF; Fluid Structure Interaction; FSI; Modal Superposition; Vortex shedding; vibrations © 2016 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of PCF 2016. Keywords: High Pressure Turbine Blade; Creep; Finite Element Method; 3D Model; Simulation. 1. Introduction 1. Introduction