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Late-Stage Vortical Structures and Eddy Motions in a Transitional Boundary Layer.pdf
CHIN.PHYS.LETT.Vo1.27,No.2(2010)024706
Late—StageVorticalStructuresand EddyM otionsin aTransitionalBoundary
Layer
LIUXiao—Bing(刘小兵),。,CHENZheng—Qing(陈政清),LIUChap—Qun(刘超群)。
W indEngineeringResearch Center,HunanUniversity,Changsha410082
。DepartmentofMathematics UniversityofTexasatArlington,Arlington,Texas 76019,USA
,
(Received15July2009)
A high—orderdirectnumericalsimulation offlow transition overafiat—plateatafreestream Machnumber0.5is
carried out.Formation anddevelopmentofthree-dimensionalvorticalstructures,typically shownas A—vortices,
hairpin vorticesandring-likevortices.raeobserved.Numericalresultsshow thatthereisastrong downdraft
motion offluid excitedbv everyring-likevortex in the late-stageofthe transition process.Attwosidesof
thevorticalstructurecenterline,thedowndraftmotionsinducedby thering-likevortex and therotating legs
superimpose.Thisisresponsiblefortheappearanceofa high—speedstreak associated with thepositivespike
observed inapreviOUSjnvestigationandtheappearanceofahigh—shearlayerinthenearwallregion.
PACS: 47.27.Cn,47.27.De
Thetransition processfrom laminartoturbulent ditionsareapplied.[]Theinflow isgivenintheofrm
flow intheboundary1ayerisabasicscientificproblem of
inmodernfluidmechanicsandhasbeenthesub1ect
q= qlam+ A2dqde(2d + A3d e(aadX:J=fly一 )
ofstudiesoveracentury.Manydifierentconceptsfor
theexplanationofthemechanismsinvolvedhavebeen
developedbasedon severalinvestigations.Theearly wheregrepresents ,v,w,P and ;qlam istheBla—
sius solution ofr the two..dimensionallaminarflat..
stagesofthetransitionprocessinaboundarylayer
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