Sökning: id:"swepub:oai:DiVA.org:kth-154351" >
On the role of adap...
On the role of adaptivity for robust laminar flow control
-
- Fabbiane, Nicolo (författare)
- KTH,Stabilitet, Transition, Kontroll,Linné Flow Center, FLOW
-
Simon, Bernhard (författare)
-
Fischer, Felix (författare)
-
visa fler...
-
Grundmann, Sven (författare)
-
- Bagheri, Shervin (författare)
- KTH,Stabilitet, Transition, Kontroll,Linné Flow Center, FLOW
-
- Henningson, Dan S. (författare)
- KTH,Stabilitet, Transition, Kontroll,Linné Flow Center, FLOW
-
visa färre...
-
(creator_code:org_t)
- 2015-02-12
- 2015
- Engelska.
-
Ingår i: Journal of Fluid Mechanics. - : Cambridge University Press (CUP). - 0022-1120 .- 1469-7645. ; 767, s. R1-R12
- Relaterad länk:
-
https://www.cambridg...
-
visa fler...
-
https://urn.kb.se/re...
-
https://doi.org/10.1...
-
visa färre...
Abstract
Ämnesord
Stäng
- In boundary layer flows, one may reduce skin friction drag by delaying the onset of laminar-to-turbulent transition via the attenuation of small-amplitude Tollmien Schlichting (TS) waves In this work, we use numerical simulations and experiments to compare the robustness of adaptive and model-based techniques for reducing the growth of two-dimensional TS disturbances. In numerical simulations, the optimal linear quadratic Gaussian (LQG) regulator shows the best performance under the conditions it was designed for However, it is found that the performance deteriorates linearly with the drift of the Reynolds number from its nominal value. As a result, an order-of-magnitude loss of performance is observed when applying the computation-based I.QG controller in wind-tunnel experiments In contrast, it is shown that the adaptive filtered-X least-mean-squares (FXLMS) algorithm is able to maintain an essentially constant performance for significant deviations of the nominal values of the disturbance amplitude and Reynolds number.
Ämnesord
- TEKNIK OCH TEKNOLOGIER -- Maskinteknik -- Strömningsmekanik och akustik (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Mechanical Engineering -- Fluid Mechanics and Acoustics (hsv//eng)
Nyckelord
- boundary layer control
- flow control
- instability control
Publikations- och innehållstyp
- ref (ämneskategori)
- art (ämneskategori)
Hitta via bibliotek
Till lärosätets databas