Numerical study of aerodynamic and aeroacoustic characteristics of flow over porous coated cylinders: effects of porous properties

Li, Z., Tang, T., Liu, Y., Arcondoulis, E.J.G. and Yang, Y. (2020) Numerical study of aerodynamic and aeroacoustic characteristics of flow over porous coated cylinders: effects of porous properties. Aerospace Science and Technology, 105, [106042]. (doi:10.1016/j.ast.2020.106042).

Abstract

The aerodynamic and aeroacoustic performances of air over porous-coated cylinders are studied numerically with a new porous-fluid coupling method, which is based on k-ω turbulence model and implemented in the in-house compressible flow solver, aerodynamic and aeroacoustic investigation simulator (AAISIM). The turbulent boundary layer of the porous-fluid interface, which was commonly overlooked, is considered in the AAISIM. The permeable Ffowcs Williams and Hawkings (PFW-H) acoustic analogy is implemented and proved to be more accurate than the Ffowcs Williams and Hawkings (FW-H) method for porous-coated cylinder case. The porous coatings with pores per inch (PPI) ranging from 5 to 80 are considered in the present study. Lift and drag forces are collected from the inner cylinder wall surface, porous matrix, and the porous-fluid interface. Instead of monotonically increasing or decreasing, both the root-mean-square (RMS) lift coefficient and the aeolian noise achieve minimum values for the 10 PPI case, and the maximum total average drag coefficient is obtained for the 20 PPI case. The dead-zone length of the porous-coated cylinder is elongated than that of the solid case. The recirculating bubbles shift away from the inner cylinder surface to the interface. The turbulent kinetic energy increases near the porous-fluid interface as the number of PPI becomes larger.

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Contributors

Author: E.J.G. Arcondoulis

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