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- W2043268372 abstract "We use the virtual boundary technique in the context of Direct Numerical Simulation of turbulent flows around cylinders. This approach allows the imposition of a no-slip boundary condition within the flow field by a feedback unsteady forcing term added to the momentum equation. The Navier-Stokes equations are solved using an accurate compact finite difference code. A spatial filtering procedure compatible with the numerical method is used to control small scale oscillations around the cylinder due to the imposition of the no-slip condition in a non-dissipative numerical code. In this paper, we consider the flow around a single cylinder with upstream conditions corresponding to a constant velocity flow or to a mixing layer flow. In the first case, common features of the cylinder wake like three-dimensional vortex shedding are recovered showing the ability of the virtual boundary technique to take complex obstacles into account realistically using a simple Cartesian grid along with accurate finite difference method. The second case corresponds to the interaction between a mixing layer and two wakes. This truly three-dimensional flow (without any homogeneous direction) shows a high distortion of the spatial development of the mixing layer, with strong upward and downward streams, respectively, in front and behind the cylinder. Vortical structures are more organized in the low-speed wake, while intense interactions between the high-speed wake and the vertical downstream velocity are observed. Main statistical results are in good agreement with experimental information." @default.
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- W2043268372 date "2002-01-01" @default.
- W2043268372 modified "2023-09-25" @default.
- W2043268372 title "Direct Numerical Simulation of Wakes with Virtual Cylinders" @default.
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- W2043268372 doi "https://doi.org/10.1080/1061856021000025184" @default.
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