Computational Methodology for Large-Eddy Simulation of Tip-Clearance Flows
نویسندگان
چکیده
A large-eddy-simulation-based ow solver that combines an immersed-boundary technique with a curvilinear structured grid has been developed to study the temporal and spatial dynamics of an incompressible rotor-tipclearance ow. The overall objective of these simulations is to determine the underlying mechanisms for lowpressure uctuations downstream of the rotor near the end wall. Salient features of the numerical methodology, includingthemesh topology,the immersed boundarymethod, the treatment ofnumerical instability fornondissipative schemes on highly skewed meshes, and the parallelization of the code for shared memory computer platforms, are discussed. The computationalapproach is shown to be capable of capturing the evolution of the highly complicated ow eld characterized by the interaction of distinct blade-associated vortical structures with the turbulent end-wall boundary layer. Simulationresults are comparedwith experiments, and qualitativeaswell as quantitative agreement is observed.
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