Direct numerical simulation of strained threedimensional wallbounded flows
Coleman, G.N., Kim, J. and Spalart, P.R. (1996) Direct numerical simulation of strained threedimensional wallbounded flows Experimental Thermal and Fluid Science, 13, (3), pp. 239251. (doi:10.1016/S08941777(96)000842).
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Description/Abstract
Fully developed twodimensional channelflow turbulence is subjected to mean strains that imitate those produced by pressure gradients in threedimensional boundary layers. This is achieved by applying irrotational temporal deformations to the flow domain in a conventional channel directnumericalsimulation (DNS) code; straining deformations at an angle with respect to the initial flow direction generate a mean cross flow and thus mean threedimensionality. The velocity difference carried by the nearwall region is further controlled by mean pressure gradients (or by accelerating the walls inplane), thus introducing another effect of pressure gradients in boundary layers. “Numerical experiments” allow the effects of the inviscid skewing mechanism, adverse pressure gradient, and inner layer to be isolated; our primary interest here is in the outer layer. We present five simulations. Inplane skewing decreases both the Reynolds shear stress and turbulent kinetic energy, whereas strains characteristic of twodimensional adverse pressure gradients increase them. In all cases, the structure parameter a1, the ratio of shear stress to energy, is diminished, which implies a reduction in the efficiency of the kinetic energy production by the mean shear.
Item Type:  Article  

Digital Object Identifier (DOI):  doi:10.1016/S08941777(96)000842  
ISSNs:  08941777 (print) 

Subjects:  
ePrint ID:  71970  
Date : 


Date Deposited:  13 Jan 2010  
Last Modified:  18 Apr 2017 20:59  
Further Information:  Google Scholar  
URI:  http://eprints.soton.ac.uk/id/eprint/71970 
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