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Memorias de investigación
Communications at congresses:
On the Dynamic Mode Decomposition of transient dynamics in unsteady laminar flows
Year:2015
Research Areas
  • Mechanical engineering,
  • Aeronautical engineering
Information
Abstract
Dynamic Mode Decomposition (DMD) is a technique, recently introduced by Schmid [1], suitable to capture flow dynam- ics and coherent structures based on Koopman modes. However, DMD is sensitive to the collected data and the transient flow trajectory. DMD of complex transient dynamics involves numerical difficulties, including robustness and accuracy. This is (among other reasons) because while DMD describes the flow dynamics as a linear combination of exponential terms, in transient flow the data may contain non exponential behaviour. This fact is very clearly illustrated by Bagheri [2], who performed a DMD analysis in the cylinder wake near the onset of unsteadiness. Besides, DMD is an Arnoldi-like algorithm that can be implemented in several ways that may not produce explicitly the same results, especially in the pres- ence of errors and in systems exhibiting concentrated spatio-temporal complexity. A deeper discussion about the exposed issues in regard to DMD will be presented at the time of the conference. The proper DMD algorithm will be selected and some new ingredients will be added, in order to improve the current DMD descriptions of transient dynamics.
International
Si
Congress
Sixth International Symposium on Bifurcations and Instabilities in Fluid Dynamics
960
Place
París
Reviewers
Si
ISBN/ISSN
00-0000-000-0
Start Date
15/07/2015
End Date
17/07/2015
From page
1
To page
1
BIFD 2015
Participants
  • Autor: Soledad Le Clainche Martinez (UPM)
  • Autor: Jose Manuel Vega De Prada (UPM)
Research Group, Departaments and Institutes related
  • Creador: Grupo de Investigación: Dinámica y estabilidad no lineal en ingeniería aeroespacial
  • Departamento: Matemática Aplicada a la Ingeniería Aeroespacial
S2i 2020 Observatorio de investigación @ UPM con la colaboración del Consejo Social UPM
Cofinanciación del MINECO en el marco del Programa INNCIDE 2011 (OTR-2011-0236)
Cofinanciación del MINECO en el marco del Programa INNPACTO (IPT-020000-2010-22)