VISCOUS-INVISCID INTERACTING FLOW THEORY

<正> In this paper a viscous-inviscid interacting flow theory(IFT)is developed for an incompressible,two-dimensional laminar flow.IFT's main points are as follows.(1)By introducing a concept of interaction lay-er where the normal momentum exchange is dominating,a new three layer structure is established.(2)Throughthe conventional manipulations and by introducing an interaction model,both the streamwise and normal lengthscales are proved to be functions of a single parameter m,which is related to the streamwise pressure gradient andReynolds number.(3)The approximate equations governing the flow of each layer as well as the whole interactionflow are derived.The present IFT is applicable to both attached and attached-separation bubble-reattached flows,The classical boundary layer theory and Triple-deck theory are shown to be two special cases of the presenttheory under m=0 and 1/4,respectively.Furthermore IFT provides new distinctions of both the normal andstreamwise length scales for flow-field numerical computation and also gives a new approach to developing the simpli-fied Navier-Stokes(SNS)equations.