Interdisciplinary Seminar in Nonlinear Science

Title: Pattern Formation for Vortex Ripples: 1D theory and 2D experiments
Speaker: Dr. M. van Hecke
Speaker Info: CATS/Niels Bohr Institute Copenhagen
Brief Description:
Special Note:

A fluid flowing over a bed of sand typically generates ripple patterns, as anybody that has walked over a beach will know. In this talk I will discuss the behavior of the ripples that occur under oscillatory fluid flow, i.e., in the coastal zone. We discuss the difficulties in applying the standard modeling tools (strongly nonlinear, subcritical, cusps). Realistic simulations of the coupled fluid-sand system yields information on the massflow of sand. Based on a simplified model of the massflow, we describe a ``minimal'' 1D model that still captures some of the essential features of sandripples. In the last part of the talk I will discuss some experiments on 2D ripple patterns.

Date: Friday, October 29, 1999
Time: 2:00pm
Where: Tech M416
Contact Person: Prof. Riecke
Contact email: h-riecke@nwu.edu
Contact Phone: 847-491-8316
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