Доступ предоставлен для: Guest
TSFP DL Home Архив Исполнительный Комитет

MODAL ANALYSIS OF COMPLEX TURBULENT FLOW

Octavian Frederich
Institute of Fluid Mechanics and Engineering Acoustics, Berlin Institute of Technology Muller-Breslau-Str. 8, Berlin, 10623, Germany

Dirk M. Luchtenburg
Institute of Fluid Mechanics and Engineering Acoustics, Berlin Institute of Technology Muller-Breslau-Str. 8, Berlin, 10623, Germany; Department of Mechanical and Aerospace Engineering Princeton University Princeton, NJ 08544

Аннотация

Three-dimensional turbulent flow is highly complex and few investigations have focused on the use of modal decompositions to characterise important physical phenomena and interactions. In this paper, we consider the Proper Orthogonal Decomposition (POD) and Dynamic Mode Decomposition (DMD). We show how the correlation matrix which is needed for POD can be reused in the computation of the DMD modes. After two introductory examples, we focus on modal decompositions of a complex turbulent flow around a wall-mounted finite cylinder at Re = 2 · 105. Finally, the usefulness of both decompositions is discussed.