A numerical investigation on effects of structural flexibility on aerodynamic far field sound

Purohit, Ashish; Darpe, Ashish K.; Singh, Shveta

doi:10.1016/j.compfluid.2013.10.042

Cited by 7 publications

(14 citation statements)

References 34 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Figure 4 shows the configuration of the grid around the test geometry. The grid convergence aspects of the flow domain have been reported in detail in the past study (Purohit et al., 2014b) by the authors for the same test configuration. Six different grid structures, from coarse to fine, have been studied.…”

Section: Numerical Test Model and Methodologymentioning

confidence: 91%

“…The MFX solution scheme is shown in Figure 2. The accuracy of the flow solver for FSI computation has been checked by the authors in their previous work (Purohit et al., 2014b). They have attempted a benchmark problem of a flow over an elastic structure and the results were validated with those in the past literature.…”

Section: Numerical Test Model and Methodologymentioning

confidence: 99%

“…To minimize the high frequency numerical noise generated by the numerical method (Tam and Webb, 1993), an artificial damping term is considered in the proposed numerical scheme. By the authors in their previous work (purohit et al, 2014b), the numerical scheme is validated for two fundamental problems of fluid mechanics, a problem of acoustic emission from a pulsating cylinder without a mean flow and an estimation of far field sound for a problem of flow over a cylinder. The results show good agreement with the results available in the literature.…”

Section: Numerical Test Model and Methodologymentioning

confidence: 99%

“…In certain conditions, the vortex shedding gets suppressed. The frequency of the pressure perturbation radiated in the surrounding is found to have reduced compared to the case when the body has no trailing plate (Purohit et al., 2014b). Ali et al.…”

Section: Introductionmentioning

confidence: 94%

“…(2010), the aerodynamic sound from a stretched thin elastic plate in turbulent field generated from an upstream obstacle is studied. In a recent study, Purohit et al. (2014b) have computed the far field aerodynamic sound from a flexible plate in flow.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Influence of flow velocity and flexural rigidity on the flow induced vibration and acoustic characteristics of a flexible plate

Purohit

Darpe

Singh

2017

Journal of Vibration and Control

Self Cite

View full text Add to dashboard Cite

A numerical investigation on the influence of structural flexibility and flow velocity on the flow-induced acoustic and vibration response of a plate is presented. Simulations are performed on a test geometry of rigid square bluff body with a trailing flexible plate in low Reynolds number flow stream. The focus of the study is to characterize the flow-induced vibration and associated aerodynamic far field sound radiation from a flexible structure in flow. The role of flow velocity and level of structural flexibility on the acoustic radiation is thoroughly investigated. A linearized Euler equation based computational aeroacoustic hybrid method and a surface source approach for coupling the flow and acoustic domains are implemented with a bi-directional fluid structure interaction. The vortex shedding frequency of the coupled fluid-structure system synchronizes with the fundamental frequency of the trailing plate and steady-state vibration of the plate is observed. The results indicate that the relation between vibration level and the flow velocity as well as structural flexibility is not linearly related. For a particular combination of flow velocity and plate stiffness, the coupled fluid-structure system shows the resonance condition. The observed resonance frequency is slightly different from the free vibration (natural) frequency of the plate. Computation of the acoustic shows that the magnitude and spectral nature of the far field sound depends on the amplitude of the vibration and a higher acoustic pressure and the sound rich in tones is observed at resonance condition.

show abstract

Section: Numerical Test Model and Methodologymentioning

confidence: 91%

Section: Numerical Test Model and Methodologymentioning

confidence: 99%