Control of separation point in periodic flows including delay effects

Tamas Insperger, Francois Lekien, Hayder Salman, George Haller, Gabor Stepan

Research output: Contribution to journalConference article

1 Citation (Scopus)


We discuss the stability of a digital control algorithm for flow separation in a time-periodic fluid flow. the analysis concentrates on the destabilizing effect of a delay existing in the control loop. This delay is inevitable and corresponds to the time needed for the effect of the controller to propagate into the flow and reach the separation profile. For the setting discussed in this paper, the delay is large relative to the time scales of the system. We show that the controller remains robust to time delays if an appropriate gain is used.

Original languageEnglish
Pages (from-to)451-455
Number of pages5
JournalIFAC Proceedings Volumes (IFAC-PapersOnline)
Issue number12
Publication statusPublished - Jan 1 2004
Event2004 IFAC Workshop on Adaptation and Learning in Control and Signal Processing, ALCOSP 2004 and IFAC Workshop on Periodic Control Systems, PSYCO 2004 - Yokohama, Japan
Duration: Aug 30 2004Sep 1 2004


  • Flow control
  • P controllers
  • Sampling
  • Stability
  • Time delay

ASJC Scopus subject areas

  • Control and Systems Engineering

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