Tube geometry can force switchlike transitions in the behavior of propagating bubbles
Microscale process engineering requires precise control of bubbles and droplets. We investigate geometry-induced control and find that a centered constriction in the cross section of rectangular tubes...
Microscale process engineering requires precise control of bubbles and droplets. We investigate geometry-induced control and find that a centered constriction in the cross section of rectangular tubes...
A simple wall-layer model for large eddy simulation with immersed boundary method
Phys. Fluids 21, 101701 (2009); doi:10.1063/1.3245294
Published 7 October 2009
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A wall-layer model is proposed for large eddy simulation of high Reynolds number turbulent flows in conjunction with immersed boundaries. The model is based on two main steps: the reconstruction of the velocity field at the first grid point off the immersed body and the modelization of the actual wall shear stress at the immersed boundary through imposition of a Reynolds averaged Navier–Stokes-like eddy viscosity obtained by means of analytical considerations. The model is tested in a turbulent plane channel flow with walls reproduced by immersed boundaries considering both Cartesian and curvilinear grids. Even with coarse and distorted grids the proposed methodology is able to reproduce accurately both first- and second-order turbulent statistics.
©2009 American Institute of Physics
| History: | Received 4 July 2009; accepted 4 September 2009; published 7 October 2009 |
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http://link.aip.org/link/?PHFLE6/21/101701/1 |
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REFERENCES (13)
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w is the wall shear stress, and 
is the fluid density. dand d
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