Wavelet spatial scaling for educing dynamic structures in turbulent open cavity flows

2011 ◽  
Vol 27 (7) ◽  
pp. 962-975 ◽  
Author(s):  
Abu Seena ◽  
Hyung Jin Sung
Keyword(s):  
Open Cavity ◽  
Cavity Flows ◽  
Spatial Scaling ◽  
Dynamic Structures

Characteristics of Oscillations in Supersonic Open Cavity Flows

2012 ◽  
Vol 90 (1) ◽  
pp. 121-142 ◽  
Author(s):  
Hongbo Wang ◽  
Mingbo Sun ◽  
Ning Qin ◽  
Haiyan Wu ◽  
Zhenguo Wang
Keyword(s):  
Open Cavity ◽  
Cavity Flows

Three-dimensional instabilities over a rectangular open cavity: from linear stability analysis to experimentation

2014 ◽  
Vol 748 ◽  
pp. 189-220 ◽  
Author(s):  
J. de Vicente ◽  
J. Basley ◽  
F. Meseguer-Garrido ◽  
J. Soria ◽  
V. Theofilis
Keyword(s):  
Three Dimensional ◽  
Reynolds Numbers ◽  
Linear Analysis ◽  
Main Flow ◽  
Open Cavity ◽  
Flow Structures ◽  
Cavity Flows ◽  
Final State ◽  
Wave Properties ◽  
Final Expression

AbstractThree-dimensional instabilities arising in open cavity flows are responsible for complex broad-banded dynamics. Existing studies either focus on theoretical properties of ideal simplified flows or observe the final state of experimental flows. This paper aims to establish a connection between the onset of the centrifugal instabilities and their final expression within the fully saturated flow. To that end, a linear three-dimensional modal instability analysis of steady two-dimensional states developing in an open cavity of aspect ratio $L/D=2$ (length over depth) is conducted. This analysis is performed together with an experimental study in the same geometry adding spanwise endwalls. Two different Reynolds numbers are investigated through spectral analyses and modal decomposition. The physics of the flow is thoroughly described exploiting the strengths of each methodology. The main flow structures are identified and salient space and time scales are characterised. Results indicate that the structures obtained from linear analysis are mainly consistent with the fully saturated experimental flow. The analysis also brings to light the selection and alteration of certain wave properties, which could be caused by nonlinearities or the change of spanwise boundary conditions.

Surface Roughness Benefits in Open Cavity Flows

2022 ◽  
Author(s):  
Ganesh Nampelly ◽  
Ananth Sivaramakrishnan Malathi ◽  
Nagabhushana Rao Vadlamani ◽  
Sriram Rengarajan ◽  
Konstantinos Kontis
Keyword(s):  
Surface Roughness ◽  
Open Cavity ◽  
Cavity Flows

On the Flow Physics of Effectively Controlled Open Cavity Flows

2013 ◽  
Author(s):  
Lawrence Ukeiley ◽  
Louis Cattafesta
Keyword(s):  
Open Cavity ◽  
Cavity Flows ◽  
Flow Physics

Numerical Simulations of Subsonic and Transonic Open-Cavity Flows

2014 ◽  
Author(s):  
Yiyang Sun ◽  
Aditya G. Nair ◽  
Kunihiko Taira ◽  
Louis N. Cattafesta ◽  
Guillaume A. Brès ◽  
...  
Keyword(s):  
Numerical Simulations ◽  
Open Cavity ◽  
Cavity Flows

Uncertainty Quantification for Direct Aeroacoustic Simulations of Cavity Flows

2019 ◽  
Vol 27 (01) ◽  
pp. 1850044 ◽  
Author(s):  
Thomas Kuhn ◽  
Jakob Dürrwächter ◽  
Fabian Meyer ◽  
Andrea Beck ◽  
Christian Rohde ◽  
...  
Keyword(s):  
Uncertainty Quantification ◽  
Acoustic Noise ◽  
High Order ◽  
Open Cavity ◽  
Small Scale ◽  
Cavity Flows ◽  
Generation Process ◽  
Random Input ◽  
Input Parameters ◽  
Uncertain Input

We investigate the influence of uncertain input parameters on the aeroacoustic feedback of cavity flows. The so-called Rossiter feedback requires a direct numerical computation of the acoustic noise, which solves hydrodynamics and acoustics simultaneously, in order to capture the interaction of acoustic waves and the hydrodynamics of the flow. Due to the large bandwidth of spatial and temporal scales, a high-order numerical scheme with low dissipation and dispersion error is necessary to preserve important small scale information. Therefore, the open-source CFD solver FLEXI, which is based on a high-order discontinuous Galerkin spectral element method, is used to perform the aforementioned direct simulations of an open cavity configuration with a laminar upstream boundary layer. To analyze the precision of the deterministic cavity simulation with respect to random input parameters, we establish a framework for uncertainty quantification (UQ). In particular, a nonintrusive spectral projection method with Legendre and Hermite polynomial basis functions is employed in order to treat uniform and normal probability distributions of the random input. The results indicate a strong, nonlinear dependency of the acoustic feedback mechanism on the investigated uncertain input parameters. An analysis of the stochastic results offers new insights into the noise generation process of open cavity flows and reveals the strength of the implemented UQ framework.

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