Bodies without secondary flows in their 3D boundary layers

There is no secondary flow in a boundary layer where streamlines coincide with the surface geodesic curves and earlier this coincidence was mathematically proven for constant pressure surfaces in ideal incompressible fluid. Two 3D inverse problems on determination of such surfaces are solved here: Design of a surface between the given body bow and an initially undetermined body cylindrical central part; Fitting such a surface with an initially undetermined bow to the given body cylindrical part.

► There is no secondary flow in 3D boundary layers on constant pressure surfaces.
► Constant pressure surfaces can cover a part of body only.
► These surfaces can be found by solving an inverse problem for ideal fluid few examples are shown.