1. Department of Mechanical Engineering, The University of Texas at San Antonio, San Antonio, TX 78249, USA
2. Department of Physics and Atmospheric Science, Dalhousie University, Halifax, Nova Scotia, Canada B3H 4R2
3. Department of Aerospace Engineering, Iowa State University, Ames, IA 50011, USA
4. J. Mike Walker ’66 Department of Mechanical Engineering, Texas A&M University, College Station, TX 77843, USA