Bouncing jets are fascinating phenomenon occurring under certain conditions when a jet impinges on a free surface. This effect is observed when the fluid is Newtonian and the jet falls in a bath undergoing a solid motion. It occurs also for non-Newtonian fluids when the jets fall in a vessel at rest containing the same fluid. We investigate numerically the impact of the experimental setting and the rheological properties of the fluid on the onset of the bouncing phenomenon. Our investigations show that the occurrence of a thin lubricating layer of air separating the jet and the rest of the liquid is a key factor for the bouncing of the jet to happen. The numerical technique that is used consists of a projection method for the Navier-Stokes system coupled with a level set formulation for the representation of the interface. The space approximation is carried out with adaptive finite elements. Adaptive refinement is shown to be very important to capture the thin layer of air that is responsible for the bouncing.
|Original language||English (US)|
|Number of pages||23|
|Journal||INTERNATIONAL JOURNAL FOR NUMERICAL METHODS IN FLUIDS|
|State||Published - 2016|
Bibliographical noteKAUST Repository Item: Exported on 2021-11-05
Acknowledgements: This work has been supported by the National Science Foundation through grant DMS-1254618 and the King Abdullah University of Science and Technology award KUS-C1-016-04.
This publication acknowledges KAUST support, but has no KAUST affiliated authors.
ASJC Scopus subject areas
- Mechanics of Materials
- Mechanical Engineering
- Computational Mechanics
- Applied Mathematics
- Computer Science Applications