Response of a flexible wall to turbulent channel flow

Sreevatsa Anantharamu, Krishnan Mahesh

Research output: Contribution to conferencePaper

Abstract

We discuss one-way coupled results of an elastic plate excited by wall-pressure fluctuations generated by Direct Numerical Simulation (DNS) of turbulent channel flow at Reτ of 180 and 400, where Reτ := uντδ , uτ is the friction velocity, δ is the half channel height and ν is the kinematic viscosity of the fluid. We present a novel framework to compute the magnitude and phase of the wall-normal distribution of the dominant flow sources to the modal force power spectral density (PSD) of the plate. This developed framework is also used to obtain the characteristics of the dominant sources in the channel that contribute to the wall-pressure fluctuation PSD. The wall-pressure fluctuations show a collapse in the spanwise similarity functions for both Reτ at high frequencies. The computed averaged displacement power spectral density of the clamped plate varies roughly as ω9 around ωδ/uτ = 100 for both Reτ. The domain within the boundary layer that contributes to the modal force PSD of the plate is maximum near the hydrodynamic coincidence frequency of the plate at Reτ = 180. The computed dominant source distribution for wall-pressure fluctuations show that the region around y+ ≈ 6 contributes to the PSD for both low and high frequency whereas the contribution of the outer region diminishes with increasing frequency. At low frequencies for Reτ = 180, there is a pair of dominant regions around y+ ≈ 40 which are opposite in phase with each other that contribute to wall-pressure fluctuation.

Original languageEnglish (US)
StatePublished - Jan 1 2019
Event11th International Symposium on Turbulence and Shear Flow Phenomena, TSFP 2019 - Southampton, United Kingdom
Duration: Jul 30 2019Aug 2 2019

Conference

Conference11th International Symposium on Turbulence and Shear Flow Phenomena, TSFP 2019
CountryUnited Kingdom
CitySouthampton
Period7/30/198/2/19

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Anantharamu, S., & Mahesh, K. (2019). Response of a flexible wall to turbulent channel flow. Paper presented at 11th International Symposium on Turbulence and Shear Flow Phenomena, TSFP 2019, Southampton, United Kingdom.