1. Numerical Solution of unsteady-flow equations has been a subject of many investigator^^^-^^, especially the boundary-layer equations and the Navier-Stokes equations. In the present w r k the transformed, time-dependent, nonlinear partial differential equations were solved by a method patterned after the AD1 scheme of Douglas and Gumz 0 and, more recently, of Beam and Warming.16-17 Phis method is second-order time accurate, spatially factored and noniterative. The conservation equations in the alternate-sweep form are then solved under prescribed (transient and streamwise varying) core-flow conditions applied at the edge of the boundary layer. For the turbulent case a variable grid size scheme of ChongZ1 is implemented in order to facilitate accurate computations near the wall where very steep flow gradients exist. We now present the salient features of the present scheme.
2. t=NAt At = 10-5 sec
3. x = 10-2 m 0.6