A hybrid model for lift response to dynamic actuation on a stalled airfoil

Xuanhong An, David R. Williams, Maziar S. Hemati

Research output: Contribution to journalArticle


The current research focuses on modeling the lift response due to dynamic (time-varying) “burst-type” actuation on a stalled airfoil. Here, the “burst-type” actuation refers to the synthetic jet (generated from the actuator) that is used for flow separation mitigation. Dynamic “burst-type” actuation exhibits two different characteristic dynamic behaviors within the system; namely, the high-frequency and low-frequency components. These characteristics introduce modeling challenges. In this paper, we propose a hybrid model composed of two individual sub-models, one for each of the two frequencies. The lift response due to high-frequency burst actuation is captured using a convolution model. The low-frequency component due to nonlinear burst-burst interactions is captured using a Wiener model, consisting of linear time-invariant dynamics and a static output nonlinearity. The hybrid model is validated using data from wind tunnel experiments.

Original languageEnglish (US)
Article number855
Issue number4
StatePublished - Jan 1 2020


  • Dynamic actuation
  • Flow control
  • Low-order modeling

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