Dispersive Shock Wave (DSW) Lab
 
 

Dispersive Shock Wave (DSW) Lab

We are currently studying dissipationless, dispersive hydrodynamic phenomena in a viscous fluid conduit system. The controlled intrusion of a lighter, less viscous fluid (e.g., corn syrup + water) into a cylinder filled with a very viscous fluid (e.g., corn syrup) can lead to the formation of an azimuthally symmetric fluid-filled pipe or conduit. In the video below, we suddenly increase the injection rate to a larger value, causing the conduit to dilate. Buoyancy causes the wider portion of the conduit to move faster than the narrower portion. Viscous forces in the external fluid balance buoyancy by generating interfacial waves, leading to an expanding oscillatory wavetrain, or dispersive shock wave (DSW for short).

DSW_modampl_2fpsHow to Embed YouTube Video by VideoLightBox.com v2.8m

Observation of a DSW in a viscous fluid conduit. 10x time speedup and 1/10 reduction in aspect ratio.


We are also studying localized solitary wave propagation and interactions in this conduit system. See images below for an example interaction and three different interaction types.
Conduit solitary wave
											 interactions