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Abstract

This paper presents an approach to accurately characterize three-dimensional (3D) wire screen geometries as simplified two-dimensional (2D) screens for low Reynolds numbers. This is achieved by identifying 2D screen geometric features that provide appropriate approximations to a 3D realistic wire screen geometry. The simplified 2D screen geometries are obtained by varying geometric characteristics such as the streamwise pitch to diameter ratio within the range of 0C/D1 for side-by-side cylinders. Both in-line and staggered cylinders with spanwise pitch to diameter ratios ranging from 2.94P/D5.56 are examined here. A parametric study is performed for equivalent wire screen open area ratios varying within the range of 43.56%β67.26%. Numerical flow field comparisons between a 3D wire screen and its approximate 2D simplification are performed, with results further validated against documented experiments. The equivalent 2D flow loss coefficients agree very closely with the full 3D results, where for some Reynolds numbers, they are found to be within 6% of the experimental results. Both 2D and 3D results are found to underpredict the experimental values. The 2D results are also found to be much more accurate than the well-known flow correlations that are commonly used. 2D turbulence intensities measured at 570 diameters downstream of the screen were found to have the same values as the experimental results for some Reynolds numbers and were within 10% at worst. This demonstrates a real advantage over a 3D model, where such a long numerical domain would be very computationally expensive. Out-of-phase vortex shedding patterns exist for both in-line and staggered screen configurations in the range of 0C/D1. The contribution of this work will enable design studies to perform preliminary fast analysis of the effect of wire screens when applied as flow or noise control technologies.

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Data Availability Statement

Some or all data, models, or code that support the findings of this study are available from the corresponding author upon reasonable request.

Acknowledgments

The research leading to these results received funding from the European Union’s Seventh Framework Programme (FP7/2007-2013) for the Clean Sky Joint Technology Initiative under Grant Agreements Number 308225 (ALLEGRA) and Number 620188 (ARTIC). The authors also thank the Irish Center for High-End Computing (ICHEC) for allowing access to their supercomputers for the computations performed in this research study.

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Go to Journal of Aerospace Engineering
Journal of Aerospace Engineering
Volume 34Issue 6November 2021

History

Received: Mar 8, 2021
Accepted: Jul 12, 2021
Published online: Aug 26, 2021
Published in print: Nov 1, 2021
Discussion open until: Jan 26, 2022

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Authors

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School of Engineering Computing and Mathematics, Oxford Brookes Univ., Oxford, OX33 1HX, UK; Buildings Fluid Dynamics Limited, 18 Herbert St., Dublin 2, Ireland. ORCID: https://orcid.org/0000-0002-3374-4810. Email: [email protected]; [email protected]
Kun Zhao, Ph.D. [email protected]
Key Lab of Aerodynamic Noise Control, China Aerodynamics Research and Development Center, Mianyang, Sichuan 621000, China. Email: [email protected]
Professor, School of Engineering, Trinity College Dublin, Univ. of Dublin, Dublin D02 PN40, Ireland. ORCID: https://orcid.org/0000-0002-8639-9504. Email: [email protected]
Chigbo Mgbemena, Ph.D. [email protected]
Professor, Dept. of Mechanical Engineering, Univ. of Nigeria, Nsukka, Enugu 410001, Nigeria. Email: [email protected]
Mkpamdi Eke, Ph.D. [email protected]
Professor, Dept. of Mechanical Engineering, Univ. of Nigeria, Nsukka, Enugu 410001, Nigeria. Email: [email protected]
Professor, School of Engineering, Trinity College Dublin, Univ. of Dublin, Dublin D02 PN40, Ireland (corresponding author). ORCID: https://orcid.org/0000-0002-1621-7533. Email: [email protected]

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