%0 Journal Article %T On Interaction of T S Waves and 3 D Localized Disturbance in a Divergent Flow Under Zero Pressure Gradient %J International Journal of Engineering %I Materials and Energy Research Center %Z 1025-2495 %A Jahanmiri, Mohsen %D 2000 %\ 11/01/2000 %V 13 %N 4 %P 35-42 %! On Interaction of T S Waves and 3 D Localized Disturbance in a Divergent Flow Under Zero Pressure Gradient %K T %K S Waves %K 3 %K D Flow %K Turbulence Spot %K Transitional Boundary Layer %R %X To simulate the effect of free st ream turbulence on turbulent spot formation, experiments were conducted on the interaction of localized three-dimensional disturbances with the harmonic waves in a laminar boundary layer on a flat plate. Experiments conducted in three-dimensional diverging flow (but zero pressure gradient) show, while individually the disturbances decay downstream, their interaction leads to amplification of three-dimensional disturbance leading to formation of the turbulent spot. Also flow divergence show the least effect in the interaction process. %U https://www.ije.ir/article_71275_57d0c9391a00e397fc02d0c0d45238c1.pdf