THEORETICAL-ANALYSIS FOR UNSTEADY BOUNDARY-LAYER ON A LINEARLY RETARDED SEMIINFINITE FLAT-PLATE

As the first step in systematic research on decelerating unsteady boun dary layers, the fundamental problem of the unsteady laminar boundary layer on a linearly retarded semi-infinite flat plate has been analyze d theoretically. Precise solutions for the flow characteristics are ob tained by means of a series expansion technique and a numerical analys is. In addition, an original semi-quantitative ''viscous diffusion the ory'' has been developed, and the physical mechanism and structure of flow behavior in the boundary layer, which cannot be explained well by any existing numerical or similar quantitative-oriented methods, have been analyzed phenomenally and are clarified satisfactorily by this n ew theory.