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A priori and a posteriori analysis of the flow around a rectangular cylinder

Cimarelli, A., Leonforte, A., Franciolini, M., De Angelis, E., Angeli, D. and Crivellini, A. 2017. A priori and a posteriori analysis of the flow around a rectangular cylinder. Journal of Physics: Conference Series 923 , 012028. 10.1088/1742-6596/923/1/012028

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Abstract

The definition of a correct mesh resolution and modelling approach for the Large Eddy Simulation (LES) of the flow around a rectangular cylinder is recognized to be a rather elusive problem as shown by the large scatter of LES results present in the literature. In the present work, we aim at assessing this issue by performing an a priori analysis of Direct Numerical Simulation (DNS) data of the flow. This approach allows us to measure the ability of the LES field on reproducing the main flow features as a function of the resolution employed. Based on these results, we define a mesh resolution which maximize the opposite needs of reducing the computational costs and of adequately resolving the flow dynamics. The effectiveness of the resolution method proposed is then verified by means of an a posteriori analysis of actual LES data obtained by means of the implicit LES approach given by the numerical properties of the Discontinuous Galerkin spatial discretization technique. The present work represents a first step towards a best practice for LES of separating and reattaching flows.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Engineering
Additional Information: Content from this work may be used under the terms of the Creative Commons Attribution 3.0 licence
Publisher: IOP Publishing: Conference Series / Institute of Physics (IoP)
ISSN: 1742-6588
Date of First Compliant Deposit: 5 July 2018
Date of Acceptance: 1 November 2017
Last Modified: 17 Jul 2019 11:19
URI: http://orca-mwe.cf.ac.uk/id/eprint/112034

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