We introduce improved reduced-order models for turbulent flows. These models are inspired from successful methodologies used in large eddy simulation, such as artificial viscosity, applied to standardmodels created by proper orthogonal decomposition of flows coupled with Galerkin projection. As a first step in the analysis and testing of our new methodology, we use the Burgers equation with a s...

The use of multitaper estimates for spectral proper orthogonal decomposition (SPOD) is explored. Multitaper and multitaper-Welch estimators that discrete prolate spheroidal sequences (DPSS) as data windows are compared to the standard SPOD algorithm exclusively relies on weighted overlapped segment averaging, or Welch's method, estimate cross-spectral density matrix. Two sets turbulent flow dat...