Numerical investigation of the control of the secondary instability process in boundary layers

L. D. Kral, Hermann F Fasel

Research output: Chapter in Book/Report/Conference proceedingConference contribution

3 Citations (Scopus)

Abstract

A numerical model has been developed for investigating boundary layer transition control for a flat plate boundary layer. Active control of a periodically forced boundary layer in an incompressible fluid is studied using surface heating techniques. The spatially evolving boundary layer is simulated. The Navier-Stokes and energy equations are integrated using a fully implicit finite difference/spectral method. Temperature perturbations are introduced locally along finite heater strips to directly attenuate the instability waves in the flow. A feedback control loop is employed in which a downstream sensor is used to monitor wall shear stress fluctuations. Active control of small amplitude two-dimensional and three-dimensional disturbances is numerically simulated. With proper phase control, in phase reinforcement and out of phase attenuation are demonstrated. A receptivity study of the localized temperature perturbations is made. It is shown that narrow heater strips are more receptive in that they maximize the amplitude level of the disturbances in the flow. Active control of the early stages of the fundamental breakdown process is also numerically simulated. Control is achieved with either two-dimensional or three-dimensional control inputs.

Original languageEnglish (US)
Title of host publicationAIAA 2nd Shear Flow Conference, 1989
PublisherAmerican Institute of Aeronautics and Astronautics Inc, AIAA
StatePublished - 1989
EventAIAA 2nd Shear Flow Conference, 1989 - Tempe, United States
Duration: Mar 13 1989Mar 16 1989

Other

OtherAIAA 2nd Shear Flow Conference, 1989
CountryUnited States
CityTempe
Period3/13/893/16/89

Fingerprint

Boundary layers
Phase control
Feedback control
Shear stress
Numerical models
Reinforcement
Heating
Temperature
Fluids
Sensors

ASJC Scopus subject areas

  • Engineering(all)

Cite this

Kral, L. D., & Fasel, H. F. (1989). Numerical investigation of the control of the secondary instability process in boundary layers. In AIAA 2nd Shear Flow Conference, 1989 [AIAA-89-0984] American Institute of Aeronautics and Astronautics Inc, AIAA.

Numerical investigation of the control of the secondary instability process in boundary layers. / Kral, L. D.; Fasel, Hermann F.

AIAA 2nd Shear Flow Conference, 1989. American Institute of Aeronautics and Astronautics Inc, AIAA, 1989. AIAA-89-0984.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Kral, LD & Fasel, HF 1989, Numerical investigation of the control of the secondary instability process in boundary layers. in AIAA 2nd Shear Flow Conference, 1989., AIAA-89-0984, American Institute of Aeronautics and Astronautics Inc, AIAA, AIAA 2nd Shear Flow Conference, 1989, Tempe, United States, 3/13/89.
Kral LD, Fasel HF. Numerical investigation of the control of the secondary instability process in boundary layers. In AIAA 2nd Shear Flow Conference, 1989. American Institute of Aeronautics and Astronautics Inc, AIAA. 1989. AIAA-89-0984
Kral, L. D. ; Fasel, Hermann F. / Numerical investigation of the control of the secondary instability process in boundary layers. AIAA 2nd Shear Flow Conference, 1989. American Institute of Aeronautics and Astronautics Inc, AIAA, 1989.
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