POD Analysis of In-Cylinder Flows

Abstract

Both time-dependent and time-invariant Proper Orthogonal Decompositions are performed on LES and PIV data as an initial step in a study of tumble breakdown in in-cylinder flows. Evidence of tumble instability during compression is found in the time-dependent POD of both data sets. Time-invariant POD modes are presented which will be used later in low-dimensional models of these systems.

Development and Application of Bivariate 2D-EMD for the Analysis of Instantaneous Flow Structures and Cycle-to-Cycle Variations of In-cylinder Flow

“…The reader is referred to [2,52] for further information about this component. Finally, the total phase-averaged kinetic energy per unit mass can be considered as a sum of the mean flow kinetic energy, E m and the phase-averaged fluctuating kinetic energy, E f , as follows [14,46]:…”