In an experiment on how turbulent boundary layers respond to acceleration in the flow around them, aerospace engineers at the observed an unexpected internal boundary layer. In an experiment on how ...

NASA is mounting an experiment the agency hopes will shed light on boundary layer transition, which caused considerable uncertainty during the space shuttle's return-to-flight mission in August 2005.

There is no clearly defined Mach number that marks the boundary between supersonic and hypersonic flight. But Mach 5 is generally taken by aerospace engineers to be where hypersonic speed begins. The ...

The Boundary Layer Transition (BOLT) payload. Credit: U.S. Air Force Office of Scientific Research/Johns Hopkins APL In another blow for U.S. hypersonic flight testing, John Hopkins University Applied ...