Journal ArticleDOI
Turbulent supersonic channel flow
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In this article, the effects of compressibility in low Reynolds number turbulent supersonic channel flow via a direct numerical simulation are studied in detail for the wall layer and the core region based on scatter plots.Abstract:
The effects of compressibility are studied in low Reynolds number turbulent supersonic channel flow via a direct numerical simulation. A pressure-velocity-entropy formulation of the compressible Navier-Stokes equations which is cast in a characteristic, non-conservative form and allows one to specify exact wall boundary conditions, consistent with the field equations, is integrated using a fifth-order compact upwind scheme for the Euler part, a fourth-order Pade scheme for the viscous terms and a third-order low-storage Runge-Kutta time integration method. Coleman et al fully developed supersonic channel flow at M?=?1.5 and Re?=?3000 is used to test the method. The nature of fluctuating variables is investigated in detail for the wall layer and the core region based on scatter plots. Fluctuations conditioned on sweeps and ejections in the wall layer are especially instructive, showing that positive temperature, entropy and total temperature fluctuations are mainly due to sweep events in this specific situ...read more
Citations
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An explicit filtering method for large eddy simulation of compressible flows
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Journal ArticleDOI
Compressibility effects and turbulence scalings in supersonic channel flow
TL;DR: In this article, the ability of outer and inner scalings to collapse profiles of turbulent stresses onto their incompressible counterparts is investigated, and a reduction in the near-wall pressure-strain, found responsible for the changed Reynolds-stress profiles, is explained using a Green's-function-based analysis of the pressure field.
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A comparison between snapshot POD analysis of PIV velocity and vorticity data
TL;DR: Proper orthogonal decomposition was performed on both the fluctuating velocity and vorticity fields of a backward-facing step (BFS) flow at Reynolds numbers of 580 and 4,660 as mentioned in this paper.
Journal ArticleDOI
Direct numerical simulation of compressible turbulent channel flow between adiabatic and isothermal walls
TL;DR: In this paper, the effects of adiabatic and isothermal conditions on the statistics in compressible turbulent channel flow were investigated using direct numerical simulation (DNS), and the results showed that Morkovin's hypothesis is not applicable to the near-wall asymptotic behaviour of the wall-normal turbulence intensity even if the variable property effect is taken into account.
Journal ArticleDOI
Evolution of the turbulent/non-turbulent interface of an axisymmetric turbulent jet
TL;DR: Westerweel et al. as mentioned in this paper measured a turbulent round air jet, using particle image velocimetry, to investigate the dynamics and transport processes at the continuous bounding interface between the turbulent and non-turbulent regions (T/NT) of the jet flow.
References
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Turbulence statistics in fully developed channel flow at low reynolds number
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Boundary conditions for direct simulations of compressible viscous flows
TL;DR: In this article, a boundary condition formulation for the Navier-Stokes equations is proposed, which is compatible with non-disjoint algorithms applicable to direct simulations of turbulent flows.
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Direct numerical simulation of turbulent channel flow up to Reτ=590
TL;DR: In this paper, numerical simulations of fully developed turbulent channel flow at three Reynolds numbers up to Reτ=590 were reported, and it was noted that the higher Reynolds number simulations exhibit fewer low Reynolds number effects than previous simulations at Reτ = 180.
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Low-storage Runge-Kutta schemes
TL;DR: All second-order, many third- order, and a few fourth-order Runge-Kutta schemes can be arranged to require only two storage locations per variable, compared with three needed by Gill's method.