The theory and application of eulerlets

Chadwick, EA ORCID: https://orcid.org/0000-0002-3743-8589, Christian, JM, Kapoulas, A and Chalasani, K 2019, 'The theory and application of eulerlets' , Physics of Fluids, 31 (4) .

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Abstract

Consider a fixed body in a uniform flow field in the limit as the Reynolds number approaches infinity and the flow field remains steady. Instead of using standard techniques and theory for describing the problem, a new method is employed based upon the concept of matching two different Green’s integral representations over a common boundary, one given by approximations valid in the near-field and the other by approximations in the far-field. Further novelty arises from the choice of a near-field, that is, the Euler flow matched to an Oseen flow far-field. This entails introducing and defining eulerlets that are Green’s functions of the Euler equation. One important consequence of the model is the presence of a new Euler wake velocity not captured in standard models. This has a constant unchanging downstream profile and arises from the matching to the far-field Oseen wake velocity. It is then shown how this representation reduces to classical inviscid ideal flow aerodynamics when applied to flow past aerofoils and wings. It is also shown how it reduces to slender body flow theory. Finally, the formulation is tested on uniform flow past a circular cylinder for mean-steady subcritical laminar flow and turbulent flow. The inviscid impermeability boundary condition is used, the drag coefficient is specified, and a constant distribution of drag eulerlets is modeled. The forward flow separation and pressure drop in the wake are captured and compare favorably with experiment. The future expectation is the modeling of multiple general shaped bodies.

Item Type: Article
Schools: Schools > School of Computing, Science and Engineering
Journal or Publication Title: Physics of Fluids
Publisher: AIP Publishing
ISSN: 1070-6631
Related URLs:
Depositing User: EA Chadwick
Date Deposited: 01 May 2019 13:33
Last Modified: 23 Apr 2020 02:30
URI: http://usir.salford.ac.uk/id/eprint/51219

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