Using the tools of Direct Numerical Simulation (DNS) and Linear Stability Theory (LST) we are studying active concepts to control nonlinear stages of transition. Besides the investigation of the well known wave superposition approach we developed a new method to actively control transitional disturbances. This concept uses the feedback of instantaneous flow data (wall shear stress or spanwise vorticity), obtainable at the wall to drive plain actuators. Avoiding long propagation distances between sensor and actuator this procedure (called ωz-control) results in a very effective damping in linear and nonlinear cases. With some extra improvements like spatial filters between sensor and actuator it is possible to delay transition even in strongly nonlinear scenarios like the K-breakdown scenario (transition due to fundamental resonance). Both methods have been investigated in a Blasius boundary layer. Besides the K-breakdown already mentioned for basic investigations a “linear” scenario was used, consisting of Tollmien-Schlichting waves with different propagation angles.
Skip Nav Destination
ASME 2002 Joint U.S.-European Fluids Engineering Division Conference
July 14–18, 2002
Montreal, Quebec, Canada
Conference Sponsors:
- Fluids Engineering Division
ISBN:
0-7918-3615-0
PROCEEDINGS PAPER
Active Control of Nonlinear Disturbances in a Blasius Boundary Layer (Keynote)
C. Gmelin,
C. Gmelin
Universita¨t Stuttgart, Stuttgart, Germany
Search for other works by this author on:
U. Rist,
U. Rist
Universita¨t Stuttgart, Stuttgart, Germany
Search for other works by this author on:
S. Wagner
S. Wagner
Universita¨t Stuttgart, Stuttgart, Germany
Search for other works by this author on:
C. Gmelin
Universita¨t Stuttgart, Stuttgart, Germany
U. Rist
Universita¨t Stuttgart, Stuttgart, Germany
S. Wagner
Universita¨t Stuttgart, Stuttgart, Germany
Paper No:
FEDSM2002-31044, pp. 1357-1362; 6 pages
Published Online:
February 24, 2009
Citation
Gmelin, C, Rist, U, & Wagner, S. "Active Control of Nonlinear Disturbances in a Blasius Boundary Layer (Keynote)." Proceedings of the ASME 2002 Joint U.S.-European Fluids Engineering Division Conference. Volume 1: Fora, Parts A and B. Montreal, Quebec, Canada. July 14–18, 2002. pp. 1357-1362. ASME. https://doi.org/10.1115/FEDSM2002-31044
Download citation file:
3
Views
Related Proceedings Papers
Low Voltage Electrostatic Actuation and Displacement Measurement Through Resonant Drive Circuit
IDETC-CIE2012
Delayed-Acceleration Feedback for Active-Multimode Vibration Control of Cantilever Beams
IDETC-CIE2007
Related Articles
Experimental Comparison of Delayed Resonator and PD Controlled Vibration Absorbers Using Electromagnetic Actuators
J. Dyn. Sys., Meas., Control (September,2000)
Optimum Active Vehicle Suspensions With Actuator Time Delay
J. Dyn. Sys., Meas., Control (March,2001)
Autonomous Vibration Suppression Using On-Line Pole-Zero Identification
J. Vib. Acoust (October,2001)
Related Chapters
QP Based Encoder Feedback Control
Robot Manipulator Redundancy Resolution
Dynamic Behavior in a Singular Delayed Bioeconomic Model
International Conference on Instrumentation, Measurement, Circuits and Systems (ICIMCS 2011)
Fault-Tolerant Control of Sensors and Actuators Applied to Wind Energy Systems
Electrical and Mechanical Fault Diagnosis in Wind Energy Conversion Systems