1. Department of Mechanical and Aerospace Engineering, University of California, Los Angeles, CA-90095-1597, USA,
2. Department of Aeronautical Engineering, University of Naples Federico II, Via Claudio 21, 80125 Naples, Italy
3. Department of Mechanical and Aerospace Engineering, University of California, Los Angeles, CA-90095-1597, USA
4. Department of Mechanical Engineering, Seattle University, 900 Broadway, Seattle, WA 98122-4228, USA