Numerical Investigation of Boundary Layer Transition Over Flat-Plate
NATIONAL UNIV OF SINGAPORE DEPT OF MECHANICAL ENGINEERING
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This paper presents two numerical cases of disturbed Navier-Stokes equations. In case 1, four order accuracy finite difference is used to investigate the evolution of negative frequency disturbance in Blasius boundary layer, results show us that negative frequency can reduce the streamwise wavelength of T-S wave, and accelerate the transition process. The effect of negative frequency lets to the breakdown of fluid structure becomes more significant. And, in the case two, two order accuracy finite volume method is used, Reynolds number is 900, and dimensionless frequency F is 86 in this case. Results present that the evolution process is more gradual in the positive frequency compare with the negative frequency in case 1. And the pressure contours clearly present a nonlinear interaction and break down process of two lambda vortexes.
- Fluid Mechanics