Abonnement à la biblothèque: Guest
Third Symposium on Turbulence and Shear Flow Phenomena
June, 25-27, 2003, International Center, Sendai, Japan

DOI: 10.1615/TSFP3

NUMERICAL SIMULATION OF LOW REYNOLDS NUMBER TURBULENT FLOW IN A RECTANGULAR ANNULAR DUCT

pages 645-650
DOI: 10.1615/TSFP3.1090
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RÉSUMÉ

The paper investigates low Reynolds number turbulent flow in a rectangular annular duct with side-wall aspect ratios of 4:2 for the outer duct and 2:1 for the inner duct. The Reynolds number was 150 based on the width of the inner rectangular duct, w, and the mean frictional velocity, uτ. Large Eddy Simulations (LES) were performed with grid sizes of 128×66×66 and 128×130×66 using the Smagorinsky Subgrid Scale (SGS) model. Then, a Direct Numerical Simulation (DNS) with a grid resolution of 128×258×130 was performed using the refined LES solution as the initial conditions.
The flow on the minor side of the channel was turbulent-like, with the streamwise velocity exhibiting typical turbulent viscous and logarithmic regions. On the major side, the flow appeared laminar-like with the streamwise velocity along wall-bisector exhibiting a Poiseuille laminar profile. The mean turbulence-driven secondary flow appeared as a chain of counter-rotating vortical flows in the near-wall and near-corner regions. The highly anisotropic and coherent Reynolds stress distributions were obtained and analyses of these Reynolds stresses revealed the generation mechanisms of the turbulence-driven secondary flow. The one-dimensional energy spectra suggested strong anisotropy in the small-scale motions near the convex corners.

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