Direct measurement of steady fluid forces upon a deformed cylinder in confined axial flow

Joly, Aurelien, de Chassey, Nicolas de Buretel, Martin, Alexandre, Cadot, Olivier ORCID: 0000-0001-7323-6418, Pastur, Luc and Moussou, Pierre (2021) Direct measurement of steady fluid forces upon a deformed cylinder in confined axial flow. JOURNAL OF FLUIDS AND STRUCTURES, 104. p. 103326.

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Official URL: http://dx.doi.org/10.1016/j.jfluidstructs.2021.103...

Abstract

This paper addresses the case of a cylinder array in axial flow at Reynolds numbers from 60000 to 110000. A comprehensive experimental and numerical study of the steady fluid forces arising from a geometrical perturbation in the array arrangement is carried out and compared with a semi-empirical model from the literature. The test rig consists of a 3x3 confined cylinder bundle with a pitch-to-diameter ratio equal to 1.33. The central cylinder can be rotated, translated or bent. Global forces and moments as well as pressure profiles at several sections are measured. Velocity profiles at both sides of the cylinder are also collected. Additionally, RANS simulations (Reynolds-averaged Navier–Stokes) are carried out. Pressure loss effects similar to the ones occurring in hydraulic pipes are found to play a major role on the velocity field. Rotation tests are in agreement with the literature: at low angles of incidence, the lift force is proportional to the angle. The supporting rod at the centre of the cylinder strongly disturbs the local lift force but does not change the global linear trend. In translation, the wake of the support generates a fluid stiffness effect. Bending tests allow to assess all terms of the semi-empirical model from the literature, which proves to be quite accurate at a sufficient distance from the ends and from the supports. In addition, the investigation provides refined quantitative measurements of local and global force coefficients of the statically deformed cylinder in rotation, translation and bending.

Item Type:	Article
Uncontrolled Keywords:	Cylinder array, Axial flow, Pressure measurement, CFD, Semi-empirical model
Divisions:	Faculty of Science and Engineering > School of Engineering
Depositing User:	Symplectic Admin
Date Deposited:	10 Feb 2022 09:59
Last Modified:	18 Jan 2023 21:12
DOI:	10.1016/j.jfluidstructs.2021.103326
Related URLs:	Author Publisher
URI:	https://livrepository.liverpool.ac.uk/id/eprint/3148610