Journal ArticleDOI
Direct Numerical Simulation of Turbulent Pipe Flow at Moderately High Reynolds Numbers
George K. El Khoury,Philipp Schlatter,Azad Noorani,Paul Fischer,Geert Brethouwer,Arne V. Johansson +5 more
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In this paper, a high-order spectral element method was used to study the flow of an incompressible viscous fluid in a smooth circular pipe of radius R and axial length 25R in the turbulent flow regime at four different friction Reynolds numbers Reτ = 180, 360, 550 and 1\text{,}000.Abstract:
Fully resolved direct numerical simulations (DNSs) have been performed with a high-order spectral element method to study the flow of an incompressible viscous fluid in a smooth circular pipe of radius R and axial length 25R in the turbulent flow regime at four different friction Reynolds numbers Reτ = 180, 360, 550 and \(1\text{,}000\). The new set of data is put into perspective with other simulation data sets, obtained in pipe, channel and boundary layer geometry. In particular, differences between different pipe DNS are highlighted. It turns out that the pressure is the variable which differs the most between pipes, channels and boundary layers, leading to significantly different mean and pressure fluctuations, potentially linked to a stronger wake region. In the buffer layer, the variation with Reynolds number of the inner peak of axial velocity fluctuation intensity is similar between channel and boundary layer flows, but lower for the pipe, while the inner peak of the pressure fluctuations show negligible differences between pipe and channel flows but is clearly lower than that for the boundary layer, which is the same behaviour as for the fluctuating wall shear stress. Finally, turbulent kinetic energy budgets are almost indistinguishable between the canonical flows close to the wall (up to y + ≈ 100), while substantial differences are observed in production and dissipation in the outer layer. A clear Reynolds number dependency is documented for the three flow configurations.read more
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Direct numerical simulation of turbulent channel flow up to
Myoungkyu Lee,Robert D. Moser +1 more
TL;DR: In this paper, a direct numerical simulation of incompressible channel flow at a friction Reynolds number of 5186 has been performed, and the flow exhibits a number of the characteristics of high-Reynolds-number wall-bounded turbulent flows.
Journal ArticleDOI
Recent advances on the numerical modelling of turbulent flows
TL;DR: A review of the problems and successes of computing turbulent flow can be found in this paper, where the authors provide the interested reader with most of the appropriate sources of turbulence modelling, exhibiting either as much detail as it is possible, by means of bibliography, or illustrating some of the most recent developments on the numerical modelling of turbulent flows.
Journal ArticleDOI
Coherent structures in a swirl injector at Re=4800 by nonlinear simulations and linear global modes
TL;DR: In this paper, the large-scale coherent motions in a realistic swirl fuel-injector geometry are analyzed by direct numerical simulations (DNS), proper orthogonal decomposition (POD), and linear global modes.
Journal ArticleDOI
Aspect ratio effects in turbulent duct flows studied through direct numerical simulation
Ricardo Vinuesa,Azad Noorani,Adrián Lozano-Durán,George K. El Khoury,Philipp Schlatter,Paul Fischer,Hassan M. Nagib +6 more
TL;DR: In this paper, the spectral element code Nek5000 is used to compute turbulent duct flows with aspect ratios 1 −7 (at Reb, c = 2800, Reτ, c ≃ 180) and aspect ratio 1 −1 (at R, c= 5600, Rτ, C ≃ 330), in streamwise-periodic boxes of length 25h.
Journal ArticleDOI
Direct numerical simulation of the flow around a wing section at moderate Reynolds number
Seyed M. Hosseini,Ricardo Vinuesa,Philipp Schlatter,Ardeshir Hanifi,Ardeshir Hanifi,Dan S. Henningson +5 more
TL;DR: In this paper, a three-dimensional direct numerical simulation has been performed to study the turbulent flow around the asymmetric NACA4412 wing section at a moderate chord Reynolds number of R e c = 400, 000, with an angle of attack of A o A = 5 ∘.
References
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Journal ArticleDOI
Turbulence statistics in fully developed channel flow at low reynolds number
TL;DR: In this article, a direct numerical simulation of a turbulent channel flow is performed, where the unsteady Navier-Stokes equations are solved numerically at a Reynolds number of 3300, based on the mean centerline velocity and channel half-width, with about 4 million grid points.
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Direct simulation of a turbulent boundary layer up to R sub theta = 1410
TL;DR: In this paper, the turbulent boundary layer on a flat plate, with zero pressure gradient, is simulated numerically at four stations between R sub theta = 225 and R sub tta = 1410.
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The law of the wake in the turbulent boundary layer
TL;DR: In this paper, the authors proposed to represent the mean-velocity profile by a linear combination of two universal functions, namely the law of the wall and the wake, and compared the results with experimental data.
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Very large-scale motion in the outer layer
TL;DR: Very large-scale motions in the form of long regions of streamwise velocity fluctuation are observed in the outer layer of fully developed turbulent pipe flow over a range of Reynolds numbers.