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http://dx.doi.org/10.12989/was.2022.34.1.127

Multi-fidelity uncertainty quantification of high Reynolds number turbulent flow around a rectangular 5:1 Cylinder  

Sakuma, Mayu (Department of Civil, Geo and Environmental Engineering, Technical University of Munich)
Pepper, Nick (Department of Aeronautics, Imperial College London)
Warnakulasuriya, Suneth (Department of Civil, Geo and Environmental Engineering, Technical University of Munich)
Montomoli, Francesco (Department of Aeronautics, Imperial College London)
Wuch-ner, Roland (Department of Civil, Geo and Environmental Engineering, Technical University of Munich)
Bletzinger, Kai-Uwe (Department of Civil, Geo and Environmental Engineering, Technical University of Munich)
Publication Information
Wind and Structures / v.34, no.1, 2022 , pp. 127-136 More about this Journal
Abstract
In this work a multi-fidelity non-intrusive polynomial chaos (MF-NIPC) has been applied to a structural wind engineering problem in architectural design for the first time. In architectural design it is important to design structures that are safe in a range of wind directions and speeds. For this reason, the computational models used to design buildings and bridges must account for the uncertainties associated with the interaction between the structure and wind. In order to use the numerical simulations for the design, the numerical models must be validated by experi-mental data, and uncertainties contained in the experiments should also be taken into account. Uncertainty Quantifi-cation has been increasingly used for CFD simulations to consider such uncertainties. Typically, CFD simulations are computationally expensive, motivating the increased interest in multi-fidelity methods due to their ability to lev-erage limited data sets of high-fidelity data with evaluations of more computationally inexpensive models. Previous-ly, the multi-fidelity framework has been applied to CFD simulations for the purposes of optimization, rather than for the statistical assessment of candidate design. In this paper MF-NIPC method is applied to flow around a rectan-gular 5:1 cylinder, which has been thoroughly investigated for architectural design. The purpose of UQ is validation of numerical simulation results with experimental data, therefore the radius of curvature of the rectangular cylinder corners and the angle of attack are considered to be random variables, which are known to contain uncertainties when wind tunnel tests are carried out. Computational Fluid Dynamics (CFD) simulations are solved by a solver that employs the Finite Element Method (FEM) for two turbulence modeling approaches of the incompressible Navier-Stokes equations: Unsteady Reynolds Averaged Navier Stokes (URANS) and the Large Eddy simulation (LES). The results of the uncertainty analysis with CFD are compared to experimental data in terms of time-averaged pressure coefficients and bulk parameters. In addition, the accuracy and efficiency of the multi-fidelity framework is demonstrated through a comparison with the results of the high-fidelity model.
Keywords
bluff-body aerodynamics; multi-fidelity methods; polynomial chaos expansions; uncertainty quantification;
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