Research on the Post-Critical Stages of Transition.
Final technical rept. 1 Mar 77-31 Jan 78,
DCW INDUSTRIES INC STUDIO CITY CA
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Linear-stability computations for the Blasius boundary layer have been performed in order to evaluate closure coefficients appearing in the Wilcox-Traci two-equation model of turbulence. The computations show that the key closure coefficient affecting the models ability to accurately predict transition, lambda, is strongly frequency dependent until a given boundary-layer disturbance has been amplified to about e to the 4th power times its initial value. Beyond this point, lambda approaches an asymptotic profile which is independent of frequency, provided the boundary layer is unstable. Although further investigation is needed, results show promise that a sound, physically-founded synthesis of linear-stability and turbulence-model methods is possible. Author
- Fluid Mechanics