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UNSTEADY RANS OF COMPLEX 3D TURBULENT FLOWS USING OVERSET GRIDS

Liang Ge
School of Civil and Environmental Engineering Georgia Institute of Technology Atlanta. GA 30332-0355; Department of Surgery, University of California San Francisco, CA 94143, USA

Joongcheol Paik
School of Civil and Environmental Engineering Georgia Institute of Technology Atlanta. GA 30332-0355 USA; Department of Civil Engineering, Kangnung-Wonju National University 120 Gangneung Daehangno, Gangneung, Gangwon, 210-702, Korea

S. Casey Jones
School of Civil and Environmental Engineering Georgia Institute of Technology Atlanta. GA 30332-0355 USA

Fotis Sotiropoulos
School of Civil and Environmental Engineering Georgia Institute of Technology Atlanta, GA 30332-0355 USA; St. Anthony Falls Laboratory, Department of Civil Engineering University of Minnesota 2 Third Avenue SE, Minneapolis, MN 55414, USA

Resumo

A numerical method is developed for solving the unsteady Reynolds-averaged Navier-Stokes (URANS) and turbulence closure equations in complex, multi-connected, 3D geometries. The governing equations are solved with a second-order-accurate finite-volume, dual-time-stepping artificial compressibility approach. Arbitrarily complex geometries are handled using domain decomposition with overset (Chimera) grids. The method is applied to simulate turbulent flows in two three-dimensional configurations inspired by the geometry of real-life bridge foundations in natural rivers: a channel with four bottom-mounted rectangular piers and a channel with a corner-mounted rectangular block. Comparisons between the computed results and laboratory measurements and flow visualization experiments lead to the conclusion that even relatively simple turbulence closure models (such as the standard k−ε model with wall functions or the one-equation Spalart-Allmaras model) can simulate flows with large-scale coherent structures with reasonable accuracy.