摘要：Particle tracing is a visualization technique that gives to the observer the
simultaneous perception of direction and velocity of the flow. An efficient
algorithm is presented allowing the computation of particle trajectories for
unsteady flows in moving meshes, including also the computation of
skin-friction particles, i.e. particles bound to the body skin. Visualization
with the OpenDX package, as well as the parallel implementation in SMP
architectures is also described. Discussion of visualization parameters, as
particle density, and frame rate in order to avoid coherence effect is discussed
