Numerical simulations of bouncing jets. (24th July 2015)

• Record Type: Journal Article
• Authors: Bonito, Andrea; Guermond, Jean‐Luc; Lee, Sanghyun
• Is Part Of: International journal for numerical methods in fluids. Volume 80:Number 1(2016)
• Page Start: 53
• Page End: 75
• Publication Date: 2015-07-24
• Subjects: bouncing jet -- Kaye effect -- entropy viscosity -- level set -- projection method -- shear‐thinning viscosity -- adaptive finite elements; Fluid dynamics -- Mathematics -- Periodicals; 532
• DOI: 10.1002/fld.4071
• Languages: English
• ISSNs: 0271-2091

Abstract

Summary: 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. Copyright © 2015 John Wiley & Sons, Ltd. Abstract : We investigate numerically fascinating bouncing jet phenomenon. Left: Laboratory Experiment of the Kaye effect taken at the High Speed Fluid Imaging Laboratory of S. Thoroddsen at King Abdullah University of Science and Technology. Right: Numerical simulation of the Kaye effect using our adaptive finite element method.