@article{(Open Science Index):https://publications.waset.org/pdf/11403, title = {DNS of a Laminar Separation Bubble}, author = {N. K. Singh and S. Sarkar}, country = {}, institution = {}, abstract = {Direct numerical simulation (DNS) is used to study the evolution of a boundary layer that was laminar initially followed by separation and then reattachment owing to generation of turbulence. This creates a closed region of recirculation, known as the laminar-separation bubble. The present simulation emulates the flow environment encountered in a modern LP turbine blade, where a laminar separation bubble may occur on the suction surface. The unsteady, incompressible three-dimensional (3-D) Navier-Stokes (NS) equations have been solved over a flat plate in the Cartesian coordinates. The adverse pressure gradient, which causes the flow to separate, is created by a boundary condition. The separated shear layer undergoes transition through appearance of ╬ø vortices, stretching of these create longitudinal streaks. Breakdown of the streaks into small and irregular structures makes the flow turbulent downstream. }, journal = {International Journal of Mechanical and Mechatronics Engineering}, volume = {5}, number = {9}, year = {2011}, pages = {1757 - 1761}, ee = {https://publications.waset.org/pdf/11403}, url = {https://publications.waset.org/vol/57}, bibsource = {https://publications.waset.org/}, issn = {eISSN: 1307-6892}, publisher = {World Academy of Science, Engineering and Technology}, index = {Open Science Index 57, 2011}, }