1. It appears that such an unphysical behavior can be avoided by extending the inverse concept to 3-0 boundary-layer flows. In this case, the displacement thicknesses distributions (other quantities can be prescribed as well) replace the one of the external velocity field which now results from the calculation. Indeed, the 3-D inverse concept has already been tested in the context of integral methodsl 6,17,18. The computations carried out have shown that it is in fact possible to extend the application of boundarylayer equations to the immediate neighbourhood of the separation line and even beyond it.
2. Thus, the problem consists of solving Eqs. 0, n, az and b, with the ('4-5-8-9) the unknowg functions-of which are following boundary conditions:
3. Equations (4-5-8-9) are solved by a finite difference method, the computational molecule of which is nhom h-l-