High-Order-Accurate Methods for Complex Unsteady Subsonic Flows

Visbal, Miguel R.; Gaitonde, Datta V.

doi:10.2514/2.591

Cited by 570 publications

(149 citation statements)

References 22 publications

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“…Compact finite difference schemes [17] with spectral-like resolution are widely used in many DNS works and many excellent results have been obtained [18,19]. Compact schemes were also used successfully in our former works [20,21].…”

Section: Methodsmentioning

confidence: 92%

Direct Numerical Simulation of Subsonic Round Turbulent Jet

Wang

et al. 2010

Flow Turbulence Combust

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Direct numerical simulation(DNS) of spatially developing round turbulent jet flow with Reynolds number 4,700 was carried out. Over 20 million grid points were used in this simulation. Fully compressible three-dimensional Navier-Stokes equations were solved. High order explicit spatial difference schemes and RungeKutta time integration scheme were used to calculate derivatives and time marching, respectively. Non-reflecting boundary conditions and exit zone techniques were adopted. Some refined computational grids were used in order to capture the smallest turbulent structures near the centerline of the jet. Low level disturbance were imposed on the jet inflow velocity to trigger the developing of turbulence. Turbulent statistics such as mean velocity, Reynolds stresses, third order velocity moments were obtained and compared with experimental data. One-dimensional velocity autospectra was also calculated. The inertial region where the spectra decays according to the k −5/3 was observed. The quantitative profiles of mean velocity and all of the third order velocity moments which were difficult to measure via experimental techniques were presented here in detail. The jet flow was proven to be close to fully self-similar around 19 jet diameters downstream of jet exit. The statistic data and revealed flow feature obtained in this paper can provide valuable reference for round turbulent jet research.

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Section: Methodsmentioning

confidence: 92%

Direct Numerical Simulation of Subsonic Round Turbulent Jet

Wang

et al. 2010

Flow Turbulence Combust

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“…In the context of structured grids, LES with Padé filters [2,4,5] has obtained very good results. However, filtering for unstructured grid is more difficult.…”

Section: Large Eddy Simulationmentioning

confidence: 90%

“…In this context "adequate dissipation" means that the dissipation of the numerical scheme has to be enough to stabilize the computations without modifying the features of the flow (in turbulent computations) or dissipate the acoustic waves (in CAA computations). For example, quasi-spectral finite differences schemes [2][3][4][5] are commonly used in such high-accuracy demanding applications. In these schemes, some of the order that it could be possible to achieve is sacrificed to obtain a better approximation in a wider range of the frequency spectrum.…”

Section: Introductionmentioning

confidence: 99%

High-Resolution Finite Volume Methods on Unstructured Grids for Turbulence and Aeroacoustics

Nogueira

Khelladi

Colominas

et al. 2011

Arch Computat Methods Eng

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In this paper we focus on the application of a higher-order finite volume method for the resolution of Computational Aeroacoustics problems. In particular, we present the application of a finite volume method based in Moving Least Squares approximations in the context of a hybrid approach for low Mach number flows. In this case, the acoustic and aerodynamic fields can be computed separately. We focus on two kinds of computations: turbulent flow and aeroacoustics in complex geometries. Both fields require very accurate methods to capture the fine features of the flow, small scales in the case of turbulent flows and very low-amplitude acoustic waves in the case of aeroacoustics. On the other hand, the use of unstructured grids is interesting for real engineering applications, but unfortunately, the accuracy and efficiency of the numerical methods developed for unstructured grids is far to reach the performance of those methods developed for structured grids. In this context, we propose the FV-MLS method as a tool for accurate CAA computations on unstructured grids. X. Nogueira ( ) · I. Colominas · J. París · H. Gómez

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“…We find that these oscillations are easily controlled with explicit filtering, but, by comparison to the previous formulation, with a much less aggressive filter. Thus, in production calculations, the high-order spatial filter [15] given by Eq. (10) was applied in the wall-normal and spanwise directions after every full time step.…”

Section: Computational Methodologymentioning

confidence: 99%

“…(15). The unsteady momentum flux coefficient hC i is set to 0.11%, and the reduced frequency is F 0:84.…”

Section: Simulation Detailsmentioning

confidence: 99%

Compressible Large-Eddy Simulation of Separation Control on a Wall-Mounted Hump

Franck

Colonius

2010

AIAA Journal

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Compressible large-eddy simulations of turbulent flow over a wall-mounted hump with active flow control are performed and compared with previous experiments. The flow is characterized by the unsteady separation before the steep trailing edge, which naturally reattaches downstream of the hump to form an unsteady turbulent separation bubble. The low Mach number large-eddy simulation demonstrated a good prediction of surface pressure coefficient, separation-bubble length, and velocity profiles compared with experiments. The effect of compressibility on the baseline flow is documented and analyzed and is found to increase the separation-bubble size, due to a reduced growth rate. Control is applied just before the natural separation point via steady suction and zero-net-mass-flux oscillatory forcing, and steady suction is shown to be more effective in decreasing the size of the separation bubble and pressure drag for the control parameters investigated. Controlled flow at a compressible subsonic Mach number is applied, and found to be slightly less effective than the same control parameters at low Mach numbers.

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High-Order-Accurate Methods for Complex Unsteady Subsonic Flows

Cited by 570 publications

References 22 publications

Direct Numerical Simulation of Subsonic Round Turbulent Jet

Direct Numerical Simulation of Subsonic Round Turbulent Jet

High-Resolution Finite Volume Methods on Unstructured Grids for Turbulence and Aeroacoustics

Compressible Large-Eddy Simulation of Separation Control on a Wall-Mounted Hump

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