A sneeze. Ocean currents. Smoke. What do these have in common? They're instances of turbulence: unpredictable, chaotic, ...

Hypersonic flight faces a critical challenge: predicting and controlling boundary layer transition from laminar to turbulent flow, which drastically ...

When it comes to engines, everyone is always looking for more. More horsepower, more torque, more efficiency. One company has ...

NASA Dryden played a key role in advancing the Grumman F-14 Tomcat's capabilities through two major research programs. From 1979 to 1985, NASA 991 explored high-angle-of-attack handling and spin ...

The influence of the flow regime (laminar, transitional or turbulent) on the convective heat transfer is considered. The authors state that the flow is considered laminar for Ra lower than 4 x 10 6 ...

A deep learning algorithm is trained to predict wall-shear stress based on flow in the outer region of transitional and turbulent boundary layer flow. Flow variables sampled from the boundary layer ...

Since the drag and heat transfer rates in hypersonic turbulent boundary layer can be several times higher than those of a laminar one, different strategies to delay the transition from laminar to ...

This eventually generates a small region of boundary layer detachment and this reattachment increase in the turbulent flow intensity, which added the action of the vortices by throwing the fluid with ...

In this case, the wake of air behind the ball is somewhat regular and is called laminar flow. When a ball is moving quickly, though, the boundary layer wraps much farther around the ball.

If the flow within the boundary layer is turbulent, the drag increases due to a larger velocity gradient at the wall. Today's commercial airplanes do not show any relevant laminar flow areas during ...

For cylinders or spheres, the space behind the air flow forms small vortices in the turbulent boundary layer. The asymmetry in the boundary layer is the cause of the pressure difference.