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Direct Numerical Simulation of Channel Flow with Wall Injection  

Na, Yang (Multidisciplinary Aerospace System Design Team, Department of Mechanical Engineering, Konkuk University)
Publication Information
Journal of Mechanical Science and Technology / v.17, no.10, 2003 , pp. 1543-1551 More about this Journal
Abstract
The present study investigates turbulent flows subject to strong wall injection in a channel through a Direct Numerical Simulation technique. These flows are pertinent to internal flows inside the hybrid rocket motors. A simplified model problem where a regression process at the wall is idealized by the wall blowing has been studied to gain a better understanding of how the near-wall turbulent structures are modified. As the strength of wall blowing increases, the turbulence intensities and Reynolds shear stress increase rapidly and this is thought to result from the shear instability induced by the injected flows at the wall. Also, turbulent viscosity grows rapidly as the flow moves downstream. Thus, the effect of wall-blowing modifies the state of turbulence significantly and more sophisticated turbulence modeling would be required to predict this type of flows accurately.
Keywords
Turbulent Flow; Wall Injection; Direct Numerical Simulation; Turbulent Viscosity;
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Times Cited By KSCI : 5  (Citation Analysis)
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