High-Resolution Modeling of Multiscale Transient Phenomena in Turbulent Boundary Layers

Kerstein, Alan R. ; Schmidt, Rodney C. ; Wunsch, Scott ; Ashurst, William T. ; Nilsen, Vebjorn ; Dreeben, Thomas D.

Sandia National Laboratories

关键词: Turbulent Flow;    Heat Transfer;    Walls;    Computerized Simulation;    42 Engineering;   

DOI  :  10.2172/781975
RP-ID  :  SAND2001-8108
RP-ID  :  AC04-94AL85000
RP-ID  :  781975

美国|英语

来源: UNT Digital Library

【 摘 要 】

High fidelity numerical simulation of wall-bounded turbulence requires physically sound representation of the small scale unsteady processes governing near-wall momentum, heat, and mass transfer. Conventional wall treatments do not capture the diverse multiphysics flow regimes relevant to engineering applications. To obtain a robust yet computationally affordable near-wall submodel for turbulent flow computations, the fine-grained spatial structure and time evolution of the near-wall flow is simulated using a model formulated on a 1D domain corresponding to the wall-normal direction. This approach captures the strong variation of flow properties in the wall-normal direction and the transient interactions between this highly inhomogeneous region and the more nearly homogeneous (at fine scales) flow farther from the wall. The 1D simulation utilizes the One Dimensional Turbulence (ODT) methodology, whose formulation for the present application is described in detail. Demonstrations of ODT performance with regard to aspects of flow physics relevant to near-wall flow modeling are presented. The coupling of ODT to a large eddy simulation (LES) of confined turbulent flow is described, and the performance of the coupled formulation is demonstrated. It is concluded that this formulation has the potential to provide the fidelity needed for engineering applications at an affordable computational cost.