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Lee, Jae Hwa
Flow Physics and Control Lab
Research Interests
  • Turbulent Flow Physics and Control
  • Incompressible and Compressible Flows
  • Fluid-Structure Interaction
  • Multi-Phase Flow with Heat Transfer

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Direct numerical simulation of a turbulent boundary layer up to Re-theta=2500

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Title
Direct numerical simulation of a turbulent boundary layer up to Re-theta=2500
Author
Lee, Jae HwaSung, Hyung Jin
Keywords
Direct numerical simulation; Turbulent boundary layer
Issue Date
2011-02
Publisher
ELSEVIER SCIENCE INC
Citation
INTERNATIONAL JOURNAL OF HEAT AND FLUID FLOW, v.32, no.1, pp.1 - 10
Abstract
Direct numerical simulations (DNSs) of a turbulent boundary layer (TBL) with Reθ=570-2560 were performed to investigate the spatial development of its turbulence characteristics. The inflow simulation was conducted in the range Reθ=570-1600 by using Lund's method. To resolve the numerical periodicity induced by the recycling method, we adopted a sufficiently long streamwise domain of x/θin,i=1000 (=125δ0,i), where θin,i is the inlet momentum thickness and δ0,i is the inlet boundary layer thickness in the inflow simulation. Furthermore, the main simulation with a length greater than 50δ0 was carried out independently by using the inflow data, where δ0 is the inlet boundary layer thickness of the main simulation. The integral quantities and the first-, second- and higher-order turbulence statistics were compared with those of previous data, and good agreement was found. The present study provides a useful database for the turbulence statistics of TBLs. In addition, instantaneous field and two-point correlation of the streamwise velocity fluctuations displayed the existence of the very large-scale motions (VLSMs) with the characteristic widths of 0.1-0.2δ and that the flow structure for a length of approximately ∼6δ fully occupies the streamwise domain statistically.
URI
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DOI
10.1016/j.ijheatfluidflow.2010.11.001
ISSN
0142-727X
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