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An intermittency model for predicting roughness induced transition
International Journal of Heat and Fluid Flow
  • Xuan Ge, Iowa State University
  • Paul A. Durbin, Iowa State University
Document Type
Article
Publication Version
Accepted Manuscript
Publication Date
8-1-2015
DOI
10.1016/j.ijheatfluidflow.2015.05.003
Abstract
An intermittency transport equation for RANS modeling, formulated in local variables, is extended for roughness-induced transition. To predict roughness effects in the fully turbulent boundary layer, published boundary conditions for k and ω are used. They depend on the equivalent sand-grain roughness height, and account for the effective displacement of wall distance origin. Similarly in our approach, wall distance in the transition model for smooth surfaces is modified by an effective origin, which depends on equivalent sand-grain roughness. Flat plate test cases are computed to show that the proposed model is able to predict transition onset in agreement with a data correlation of transition location versus roughness height, Reynolds number, and inlet turbulence intensity. Experimental data for turbine cascades are compared to the predicted results to validate the proposed model.
Comments

This is a manuscript of an article from International Journal of Heat and Fluid Flow 54 (2015): 55, doi:10.1016/j.ijheatfluidflow.2015.05.003. Posted wither permission

Rights
Copyright 2015. This manuscript version is made available under the CC-BY-NC-ND 4.0 license. http://creativecommons.org/licenses/bync- nd/4.0/
Copyright Owner
Elsevier Inc.
Language
en
File Format
application/pdf
Citation Information
Xuan Ge and Paul A. Durbin. "An intermittency model for predicting roughness induced transition" International Journal of Heat and Fluid Flow Vol. 54 (2015) p. 55 - 64
Available at: http://works.bepress.com/paul_durbin/15/