Flow Field (IMAGE) Colorado State University Caption Flow field for a fluid that flows easily in the bottom layer but has a more viscous, nonlinear viscoplastic behavior in the top two-thirds of the region. This material exhibits starkly changing behavior in the hyperbolic arc. Credit Computation with the ASPECT code by Menno Fraters, University of Utrecht; visualization by Wolfgang Bangerth, Colorado State University Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.