Campus Units

Aerospace Engineering

Document Type

Article

Publication Version

Accepted Manuscript

Publication Date

8-1-2015

Journal or Book Title

International Journal of Heat and Fluid Flow

Volume

54

First Page

55

Last Page

64

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