1. Research Fellow, Dept. of Aerospace Engineering, College of Engineering, Univ. of Michigan, Ann Arbor, MI 48109-2140.
2. François-Xavier Bagnoud Professor, Dept. of Aerospace Engineering, College of Engineering, Univ. of Michigan, Ann Arbor, MI 48109-2140.
3. Felix Pawlowski Collegiate Professor, Dept. of Aerospace Engineering and Dept. of Mechanical Engineering (courtesy), College of Engineering, Univ. of Michigan, Ann Arbor, MI 48109-2140 (corresponding author).