10,377 research outputs found
Effects of an aft facing step on the surface of a laminar flow glider wing
A motor glider was used to perform a flight test study on the effects of aft facing steps in a laminar boundary layer. This study focuses on two dimensional aft facing steps oriented spanwise to the flow. The size and location of the aft facing steps were varied in order to determine the critical size that will force premature transition. Transition over a step was found to be primarily a function of Reynolds number based on step height. Both of the step height Reynolds numbers for premature and full transition were determined. A hot film anemometry system was used to detect transition
Piecewise-linear maps with heterogeneous chaos
Chaotic dynamics can be quite heterogeneous in the sense that in some regions
the dynamics are unstable in more directions than in other regions. When
trajectories wander between these regions, the dynamics is complicated. We say
a chaotic invariant set is heterogeneous when arbitrarily close to each point
of the set there are different periodic points with different numbers of
unstable dimensions. We call such dynamics heterogeneous chaos (or
hetero-chaos), While we believe it is common for physical systems to be
hetero-chaotic, few explicit examples have been proved to be hetero-chaotic.
Here we present two more explicit dynamical systems that are particularly
simple and tractable with computer. It will give more intuition as to how
complex even simple systems can be. Our maps have one dense set of periodic
points whose orbits are 1D unstable and another dense set of periodic points
whose orbits are 2D unstable. Moreover, they are ergodic relative to the
Lebesgue measure.Comment: 16 pages, 9 figure
Rotorcraft linear simulation model. Volume 2: Computer implementation
A computer program used to process the equations is presented, and a full description of equation implementation is given. The model was implemented in the IBM 360 and CDC series computer systems
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