Abstracts - KTH Mechanics

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150 a Institute of Thermophysics, 630090, Novosibirsk, Russia 1 Derzho and Grimshaw, Phys. Fluids, 9, 3378 (1997) 2 Derzho and Grimshaw, J. Fluid <strong>Mechanics</strong>, 464, 217 (2002)
LES of a turbulent channel flow at streamwise rotation N. A. Alkishriwi, M. Meinke, and W. Schröder ∗ In many engineering and industrial applications the investigations of rotating turbulent flows is of great interest. In this type of flow the Coriolis force has a strong influence on the turbulence. For instance, turbulent flows in a rotating channel are severely affected by this force, which is induced by the system rotation. It produces a secondary flow in the spanwise direction. Some research has been done for channel flows with a spanwise rotation axis 1 . However, up to now very few investigations have been done on channel flows with a rotation about the streamwise axis. Analyses of this type of flow based on Lie-group theory and DNS 2 suggest that a secondary flow perpendicular to the main flow direction is generated whose distribution strongly depends on the rotational speed 3 . In the present study an LES of a turbulent streamwise rotating channel flow at Reτ =180is performed using a moving grid method to predict the three-dimensional structures and secondary flows. Among different issues the impact of the formulation on the spanwise boundary condition is one of the major objectives of this study. That is, the question whether or not periodic boundary conditions in the spanwise direction allow to numerically reproduce the experiments conducted by Recktenwald et al. will be addressed. The simulations are carried out at rotation rates corresponding to Rossby numbers Ro = ub/Hf with H being half the channel height Ro = ∞, Ro = 65.2, andRo = 37.5. Results First, the method of solution has been applied to compute the flow in a stationary channel (Ro = ∞) atthesame Reynoldsnumber. The turbulent statistics and the mean flow profiles are compared with the direct numerical simulations of Kim et al. 4 . Figure 1 shows the convincing comparison of the distribution of the LES based streamwise, spanwise, and normal Reynolds stresses with DNS findings. The final version of the study will focus on the detailed discussion of the flow field in the streamwise rotating channel. A first result of the averaged spanwise velocity profile is shown also in fig. 1. ∗Institute of Aerodynamics, RWTH Aachen University, Wüllnerstraße 5 thr. 7, D-52062 Aachen, Germany. 1Kristofferson and Andersson, J. Fluid Mech 256, 163 (1993). 2Oberlack et al., Proceedings of the Center for turbulence Summer Programm 221 (1998). 3Recktenwald et al., Proc. of the Tenth European Turbulence Conf., Trondheim, Norway 2004. 4Kim et al., J. Fluid Mech 177, 133 (1987). σ(v’’)/u τ σ(w’’)/uτ σ(u’’)/uτ 3.5 3 2.5 2 1.5 1 0.5 DNS KMM LES at Ro = ∞ 0 0 50 100 y 150 200 + u 3 0.04 0.02 0 -0.02 -0.04 -1 -0.5 0 y Ro. = 65.2 0.5 1 Figure 1: Distribution of the streamwise, spanwise, and normal Reynolds stresses (left), spanwise velocity distribution (right). 151
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EFMC6 KTH Electronic version Abstra
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Euromech Fluid Mechanics Lecturer H
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Session 1
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Global stability of the rotating di
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Continuous Spectrum Growth and Moda
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The influence of centrifugal buoyan
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Prediction of wall bounded flows us
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Uncertainty Quantification in Large
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Stratified turbulence G. Brethouwer
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Investigations of turbulence statis
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Coupling weather-scale flow with st
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Flow Separation from a Free Surface
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Phase-Field Simulations of Free Bou
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Evaluation of a universal transitio
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Computations of turbulent boundary
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Low-speed streaks developing at the
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Dynamic Lift of Airfoils R. Grüneb
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Numerical simulation of the three-d
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Effects of the flexibility of the a
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Stability and sensitivity analysis
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Stability of reacting gas jets Jose
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LIST OF AUTHORS Tuzi R. 11 Wolters
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Abstracts - KTH Mechanics

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