On current controversy of unsteady separation
Abstract
Current controversy about unsteady separation is discussed. Compared to the existing MRS and Goldstein singularity criteria, our proposed analogy criterion is more specific in the detailed steps to identify separation, and those steps are straightforward to follow. The analogous limiting flow pattern in the x, t-plane provides an independent signal of separation in addition to the usual separation symptoms. For the impulsively-started cylinder problem, our prediction of the separation starting time is close to that of Van Dommelen and Shen, but contradicts to Cebeci's in basic terms. Detailed comparisons with Cebeci's calculation are given.
- Publication:
-
Symposium on Numerical and Physical Aspects of Aerodynamic Flows
- Pub Date:
- 1981
- Bibcode:
- 1981snpa.procR....W
- Keywords:
-
- Boundary Layer Equations;
- Boundary Layer Separation;
- Computational Fluid Dynamics;
- Singularity (Mathematics);
- Three Dimensional Boundary Layer;
- Unsteady Flow;
- Displacement;
- Flow Distribution;
- Laminar Boundary Layer;
- Oscillating Cylinders;
- Reversed Flow;
- Skin Friction;
- Stagnation Flow;
- Steady Flow;
- Fluid Mechanics and Heat Transfer