Visualization of Numerical Unsteady Fluid Flows

Instantaneous streamlines are commonly used to visualize particle paths in steady flows. It is shown, however, that streaklines are often more appropriate for unsteady flows. The typical size of unsteady flow simulations makes interactive visualization difficult if not impossible. Two common approaches for visualizing unsteady flows are described. The advantages and disadvantages of each are discussed. Many visualization systems have been developed for steady flows, yet relatively few have been developed specifically for those that are unsteady. The system developed at NASA Ames Research Center has produced effective visualization for many unsteady flows. The features of this system are introduced and some results are shown. Future directions are also discussed.