This demonstration illustrates the motion of a suspension of
ellipsoidal objects under shear. The simulation is based on a
dissipative particle dynamics (DPD) algorithm written at NIST. The DPD
program determines the viscosity of the suspension as a function of
shear rate and particle size and shape distribution. It is currently
being modified to determine yield stress.
The numerical simulation was done by Nicos Martys with parallel
programming support by Jim Sims. The graphics conversion of the
resulting data to Virtual Reality Modeling Language (VRML) was done by Steve
Satterfield. Use of VRML allows the visualization to be widely
distributed to anyone with access to the internet.
This demonstration should run on any machine with a VRML browser.
It has been tested using Netscape and the CosmoPlayer plug-in on both
SGI
workstations and Windows
PCs. Note that the download is fairly quick. However, once the
download has completed, expect your browser to appear to hang up for
2 to 5 minutes depending on the speed of your machine. It has been
successfully run on a 133MHz Pentium with 64MB memory and a low end
graphics card.
You can see
