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Flow transition with 2-D roughness elements in a 3-D channelWe develop a new numerical approach to study the spatially evolving instability of the streamwise dominant flow in the presence of roughness elements. The difficulty in handling the flow over the boundary surface with general geometry is removed by using a new conservative form of the governing equations and an analytical mapping. The numerical scheme uses second-order backward Euler in time, fourth-order central differences in all three spatial directions, and boundary-fitted staggered grids. A three-dimensional channel with multiple two-dimensional-type roughness elements is employed as the test case. Fourier analysis is used to decompose different Fourier modes of the disturbance. The results show that surface roughness leads to transition at lower Reynolds number than for smooth channels.
Document ID
19940016993
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Liu, Zhining (Colorado Univ. Colorado Springs, CO, United States)
Liu, Chaoquin (Colorado Univ. Colorado Springs, CO, United States)
Mccormick, Stephen F. (Colorado Univ. Colorado Springs, CO, United States)
Date Acquired
September 6, 2013
Publication Date
November 1, 1993
Publication Information
Publication: NASA. Langley Research Center, The Sixth Copper Mountain Conference on Multigrid Methods, Part 2
Subject Category
Fluid Mechanics And Heat Transfer
Accession Number
94N21466
Funding Number(s)
CONTRACT_GRANT: NAS1-19312
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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