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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


Structure of the turbulent boundary layer over a rod-roughened wall

DC Field Value Language Lee, Jae Hwa ko Lee, Seung-Hyun ko Kim, Kyoungyoun ko Sung, Hyung Jin ko 2014-12-31T05:49:42Z - 2014-12-31 ko 2009-12 -
dc.identifier.citation INTERNATIONAL JOURNAL OF HEAT AND FLUID FLOW, v.30, no.6, pp.1087 - 1098 ko
dc.identifier.issn 0142-727X ko
dc.identifier.uri -
dc.identifier.uri ko
dc.description.abstract Turbulent coherent structures near a rod-roughened wall are scrutinized by analyzing instantaneous flow fields obtained from direct numerical simulations (DNSs) of a turbulent boundary layer (TBL). The roughness elements used are periodically arranged two-dimensional spanwise rods, and the roughness height is k/δ = 0.05 where δ is the boundary layer thickness. The Reynolds number based on the momentum thickness is varied in the range Reθ = 300-1400. The effect of surface roughness is examined by comparing the characteristics of the TBLs over smooth and rough walls. Although introduction of roughness elements onto the smooth wall affects the Reynolds stresses throughout the entire boundary layer when scaled by the friction velocity, the roughness has little effect on the vorticity fluctuations in the outer layer. Pressure-strain tensors of the transport equation for the Reynolds stresses and quadrant analysis disclose that the redistribution of turbulent kinetic energy of the rough wall is similar to that of the smooth wall, and that the roughness has little effect on the relative contributions of ejection and sweep motions in the outer layer. To elucidate the modifications of the near-wall vortical structure induced by surface roughness, we used two-point correlations, joint weighted probability density function, and linear stochastic estimation. Finally, we demonstrate the existence of coherent structures in the instantaneous flow field over the rod-roughened surface. ko
dc.description.statementofresponsibility close -
dc.language ENG ko
dc.publisher ELSEVIER SCIENCE INC ko
dc.subject Direct numerical simulation ko
dc.subject Roughness sublayer ko
dc.subject Surface roughness ko
dc.subject Turbulent boundary layer ko
dc.subject Turbulent vortical structure ko
dc.title Structure of the turbulent boundary layer over a rod-roughened wall ko
dc.type ARTICLE ko
dc.identifier.scopusid 2-s2.0-71849088993 ko
dc.identifier.wosid 000273219300006 ko
dc.type.rims ART ko
dc.description.wostc 11 * 2015-05-06 *
dc.identifier.doi 10.1016/j.ijheatfluidflow.2009.08.002 ko
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