Unsteady simulations of turbulent flow behind a triangular bluff body

Madabhushi, Ravi K.; Choi, D.; Barber, Thomas J.

doi:10.2514/6.1997-3182

Cited by 9 publications

(5 citation statements)

References 6 publications

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“…25 The unsteady Navier-Stokes equations were solved using different turbulence models. Madabushi et al 16 used the same code to study six different cases of flow behind the triangular bluff body and found that the k-ε model with wall functions gave the best overall comparison with the measured centerline data done by Sjunnesson et al 26 The k-ε model is used in the present study. The bluff body is an equilateral triangular cylinder with each side being 40 mm.…”

Section: Flame Holder Examplementioning

confidence: 96%

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Fast Fourier Transform Convergence Criterion for Numerical Simulations of Periodic Fluid Flows

Ahmed

Barber

2005

AIAA Journal

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Determining when a numerical simulation is fully converged is important in getting accurate and reliable results. In unsteady problems, especially those involving periodic flows, it is not easy to judge convergence based on the existing convergence criteria. In this study, a convergence criterion based on an analysis of the frequency content of several flow variables using the fast Fourier transform (FFT) is suggested. This FFT convergence criterion has an advantage in that it is based on evaluation of the physical flow variables. Two conditions are set to judge convergence using the FFT convergence criterion. The first condition deals with the errors associated with the selection of the number of samples, whereas the other deals with the physical frequencies and their amplitudes.The FFT convergence criterion is tested and applied to two different unsteady flow problems, which have been solved numerically using two different flow solver codes. The results show that the suggested FFT convergence criterion can be applied successfully and easily to judge the degree of convergence of numerical simulations of periodic fluid flows. NomenclatureA = normalized amplitude Dt = sampling rate d = hydraulic diameter of jet, m f = frequency, Hz H = computational domain height, m J = momentum flux ratio L = computational domain length, m N = number of data p = point Sr = Strouhal number t = time, s u = axial-velocity component, m/s v = vertical-velocity component, m/s W = computational domain depth, m w = spanwise-velocity component, m/s x = axial distance, m y = vertical distance, m z = spanwise distance, m Subscripts c = cutoff ds = data samples eb = error band FFT = fast Fourier transform max = maximum p = predicted sp = spacing 1 = error frequency 2 = dominant physical frequency 3 = secondary physical frequency

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Section: Flame Holder Examplementioning

confidence: 96%

“…The k-ε model has been used successfully to simulate problems such as flow over bluff bodies. 15,16 The aim of this study is to examine an alternative convergence criterion based on a fast Fourier transform (FFT) frequency analysis of several flow variables. This convergence criterion is for periodic fluid flows.…”

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confidence: 99%

Fast Fourier Transform Convergence Criterion for Numerical Simulations of Periodic Fluid Flows

Ahmed

Barber

2005

AIAA Journal

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“…With the development of aero-engines, afterburner technology is in continuous pursuit of higher combustion efficiency and stability, lower fluid loss, and lighter structural quality [2]. It has been gradually difficult for the traditional afterburner to meet design requirements owing to the inherent defects arising from its structural characteristics [3]. Therefore, the concept of integrated design of components in the afterburner has become an essential development direction.…”

Section: Introductionmentioning

confidence: 99%

Effects of Bypass Flow Distribution on Cold Flow Characteristics of Integrated Afterburner

et al. 2021

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Integrated design is a trend in the development of afterburners, and the distribution of cold flow is directly related to their flow field characteristics, combustion organization, and the cooling effect of components. Numerical simulations were performed to illustrate the effects of bypass flow distribution on the flow distribution, mixing characteristics, and cooling efficiency of the components by varying the cooling flow path structure parameters. Within the range of parameters in this study, it can be indicated that with the increase of heat shield inlet height and afterburner annulus height, the total pressure recovery coefficient along the path increased accordingly, and the increasing rate at the afterburner outlet is 1.12% and 1.19%, respectively. The average cooling efficiency of radial flameholder, circumferential flameholder, and fuel injector all decrease, but the rate of decrease varies slightly depending on the location of the components. The increase of heat shield inlet height would reduce thermal mixing efficiency by approximately 5.4% at the afterburner outlet, and the increase of afterburner annular height would increase about 2.9%.

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“…al. [5] and Gedikli [12] using mostly numerical simulations. The signal detection and processing have been discussed by Hans et.…”

Section: Introductionmentioning

confidence: 99%

D2.3 - Numerical Investigation of Unsteady Flowfield of DN25 Flow Meter with Pressure Chamber

Gedikli¹,

Krisch²,

Lavante³

2013

Proceedings SENSOR 2013

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Unsteady simulations of turbulent flow behind a triangular bluff body

Cited by 9 publications

References 6 publications

Fast Fourier Transform Convergence Criterion for Numerical Simulations of Periodic Fluid Flows

Fast Fourier Transform Convergence Criterion for Numerical Simulations of Periodic Fluid Flows

Effects of Bypass Flow Distribution on Cold Flow Characteristics of Integrated Afterburner

D2.3 - Numerical Investigation of Unsteady Flowfield of DN25 Flow Meter with Pressure Chamber

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