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contributor authorRehill, Brendan
contributor authorWalsh, Ed J.
contributor authorBrandt, Luca
contributor authorSchlatter, Philipp
contributor authorZaki, Tamer A.
contributor authorMcEligot, Donald M.
date accessioned2017-05-09T01:03:18Z
date available2017-05-09T01:03:18Z
date issued2013
identifier issn0889-504X
identifier otherturb_135_1_011019.pdf
identifier urihttp://yetl.yabesh.ir/yetl/handle/yetl/153380
description abstractAn artificial turbulent spot is simulated in a zero freestream turbulence base flow and a base flow with organized streaks. Six identification methods are used in order to isolate the turbulent spot from the surrounding nonturbulent fluid. These are (i) instantaneous wallnormal velocity v, (ii) instantaneous spanwise velocity w, (iii) instantaneous turbulent dissipation, (iv) خ»2 criterion, (v) Q criterion, and (vi) gradient of the finite time Lyapunov exponent. All methods are effective in isolating the turbulent spot from the streaks. The robustness of each technique is determined from the sensitivity of the maximum spot dimensions to changes in threshold level. The Q criterion shows the least sensitivity for the zero freestream turbulence case and the instantaneous turbulent dissipation technique is least sensitive in the organized streaks case. For both cases the v technique was the most sensitive to changes in threshold level.
publisherThe American Society of Mechanical Engineers (ASME)
titleIdentifying Turbulent Spots in Transitional Boundary Layers
typeJournal Paper
journal volume135
journal issue1
journal titleJournal of Turbomachinery
identifier doi10.1115/1.4006395
journal fristpage11019
journal lastpage11019
identifier eissn1528-8900
treeJournal of Turbomachinery:;2013:;volume( 135 ):;issue: 001
contenttypeFulltext


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