A front tracking scheme for high density-ratio multi-fluid flows

Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/77168/1/AIAA-1999-3326-834.pd

Simulation of vortex sheet roll-up by vortex methods

The vortex sheet roll-up characteristic of large amplitude Kelvin-Helmholtz instability is simulated by vortex-in-cell methods and a vortex blob method. Both methods regularize the problem and prevent the irregular motion found in many previous simulations. The regularization properties of the methods are compared and discussed.Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/28097/1/0000544.pd

Numerical simulations of the Rayleigh-Taylor instability

Two Lagrangian-Eulerian vortex methods to simulate the motion of an interface between inviscid fluids of different densities are presented. The representation of the interface as a vortex sheet eliminates numerical diffusion, and by coupling the tracked interface with a stationary grid (using the well-known vortex-in-cell method) the high cost associated with traditional vortex methods is reduced. These methods are applied to the Rayleigh-Taylor instability. For finite density ratios the appearance of rolled up vortices and a possible singularity formation has limited simulations in the past. By providing proper regularization our methods overcome some of these difficulties.Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/27355/1/0000380.pd

Numerical simulations of three-dimensional drop collisions

Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/77346/1/AIAA-13136-185.pd

Do Goals Matter in Engineering Education? An Exploration of How Goals Influence Outcomes for FIRST Robotics Participants

It has long been recognized that engineers need a variety of skills, including technical and social, to succeed professionally. Attempts to include social skills (i.e., communication, teamwork, and leadership) in engineering education are relatively recent (i.e., within the last decade). Thus, the current study investigates whether social goals influence academic and social outcomes. Four hundred and three highschool aged robotics participants (262 male; 146 female; 22 not specified) completed a survey about their experiences in FIRST Prior to completing the survey, participants learned that an important goal of FIRST was a) social networking, b) academic learning, or c) no goal. Academic and social outcomes were assessed at the beginning and end of the season, but the goal instructions were administered only at the beginning of the season. The findings show that the goals promoted can dramatically influence social and academic outcomes. The implications this has for engineering programs are discussed

The nonlinear behavior of a sheared immiscible fluid interface

The two-dimensional Kelvin–Helmholtz instability of a sheared fluid interface separating immiscible fluids is studied by numerical simulations. The evolution is determined by the density ratio of the fluids, the Reynolds number in each fluid, and the Weber number. Unlike the Kelvin–Helmholtz instability of miscible fluids, where the sheared interface evolves into well-defined concentrated vortices if the Reynolds number is high enough, the presence of surface tension leads to the generation of fingers of interpenetrating fluids. In the limit of a small density ratio the evolution is symmetric, but for a finite density difference the large amplitude stage consists of narrow fingers of the denser fluid penetrating into the lighter fluid. The initial growth rate is well predicted by inviscid theory when the Reynolds numbers are sufficiently high, but the large amplitude behavior is strongly affected by viscosity and the mode that eventually leads to fingers is longer than the inviscidly most unstable one. © 2002 American Institute of Physics.Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/70733/2/PHFLE6-14-8-2871-1.pd