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Requirements for Large Eddy Simulation Computations of Variable-Speed Power Turbine FlowsVariable-speed power turbines (VSPTs) operate at low Reynolds numbers and with a wide range of incidence angles. Transition, separation, and the relevant physics leading to them are important to VSPT flow. Higher fidelity tools such as large eddy simulation (LES) may be needed to resolve the flow features necessary for accurate predictive capability and design of such turbines. A survey conducted for this report explores the requirements for such computations. The survey is limited to the simulation of two-dimensional flow cases and endwalls are not included. It suggests that a grid resolution necessary for this type of simulation to accurately represent the physics may be of the order of Delta(x)+=45, Delta(x)+ =2 and Delta(z)+=17. Various subgrid-scale (SGS) models have been used and except for the Smagorinsky model, all seem to perform well and in some instances the simulations worked well without SGS modeling. A method of specifying the inlet conditions such as synthetic eddy modeling (SEM) is necessary to correctly represent the inlet conditions.
Document ID
20160004678
Acquisition Source
Glenn Research Center
Document Type
Contractor Report (CR)
Authors
Ameri, Ali A.
(Ohio State Univ. Columbus, OH, United States)
Date Acquired
April 6, 2016
Publication Date
March 1, 2016
Subject Category
Aerodynamics
Aeronautics (General)
Report/Patent Number
NASA/CR-2016-218962
E-19198
GRC-E-DAA-TN29070
Funding Number(s)
CONTRACT_GRANT: NNC12BA01B
WBS: WBS 664817.02.03.02.01.01
Distribution Limits
Public
Copyright
Public Use Permitted.
Keywords
Grid
VSPT
LES
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