The interaction problem for the locally cooled free convection boundary layer

The free convection boundary layer which forms on a heated vertical flat pl ate of constant temperature is investigated in the vicinity of a localized disturbance of the wall temperature. In a small region the wall is cooled i n a prescribed manner. The short strong disturbance results in an interacti on problem which is solved numerically. If the disturbances are sufficientl y weak, the interaction equations can be linearised allowing for analytical solutions. For strong disturbances, a numerical calculation of the non-lin ear interaction problem is performed.