1. Institute of Computational Sciences, ETH Zentrum, WET D5, Weinbergstrasse 43, CH-8092 Zurich, Switzerland, NASA Ames Research Center, Moffett Field, California 94035, Eloret Corporation, 690 West Fremont Avenue, Sunnyvale, California, and Center for Turbulence Research, NASA Ames/Stanford University, Moffett Field, California 94035