Bibliographical noteFunding Information:
This paper was one of the major outcomes from the AIAA Discussion Group (Fluid Dynamics Technical Committee) entitled ?Modal Decomposition of Aerodynamic Flows? organized by Douglas Smith, Kunihiko Taira, Maziar Hemati, and Karthik Duraisamy. The authors thank the fruitful discussions with the members of the discussion group, and greatly acknowledge the generous support from the following agencies: Air Force Office of Scientific Research, Army Research Office, National Science Foundation, Office of Naval Research, and Defense Advanced Research Projects Agency. Lastly, the authors sincerely thank the Editor-in-Chief, Alexander Smits, and Associate Editor, Peyman Givi, of the AIAA Journal for supporting the overall effort to make this special section on modal analysis possible.