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|Title:||Initial Condition Effects on Large Scale Structure in Numerical Simulations of Plane Mixing Layers|
|Authors:||McMullan, William Andrew|
Garrett, Stephen J.
|Publisher:||American Institute of Physics|
|Citation:||Physics of Fluids, 2016, 28, 015111|
|Abstract:||In this paper, Large Eddy Simulations are performed on the spatially developing plane turbulent mixing layer. The simulated mixing layers originate from initially laminar conditions. The focus of this research is on the effect of the nature of the imposed fluctuations on the large-scale spanwise and streamwise structures in the flow. Two simulations are performed; one with low-level three-dimensional inflow fluctuations obtained from pseudo-random numbers, the other with physically correlated fluctuations of the same magnitude obtained from an inflow generation technique. Where white-noise fluctuations provide the inflow disturbances, no spatially stationary streamwise vortex structure is observed, and the large-scale spanwise turbulent vortical structures grow continuously and linearly. These structures are observed to have a three-dimensional internal geometry with branches and dislocations. Where physically correlated provide the inflow disturbances a “streaky” streamwise structure that is spatially stationary is observed, with the large-scale turbulent vortical structures growing with the square-root of time. These large-scale structures are quasi-two-dimensional, on top of which the secondary structure rides. The simulation results are discussed in the context of the varying interpretations of mixing layer growth that have been postulated. Recommendations are made concerning the data required from experiments in order to produce accurate numerical simulation recreations of real flows.|
|Rights:||Copyright © 2016 AIP Publishing LLC. This article may be downloaded for personal use only. Any other use requires prior permission of the author and AIP Publishing. The following article appeared in Physics of Fluids, 2016, 28, 015111 and may be found at http://scitation.aip.org/content/aip/journal/pof2/28/1/10.1063/1.4939835. Deposited with reference to the publisher’s archiving policy available on the SHERPA/RoMEO website.|
|Appears in Collections:||Published Articles, Dept. of Engineering|
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|PoF-2016.pdf||Post-review (final submitted)||2.43 MB||Adobe PDF||View/Open|
|1.4939835.pdf||Published (publisher PDF)||7.36 MB||Adobe PDF||View/Open|
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