Sökning: "drag reduction"

Visar resultat 26 - 30 av 57 avhandlingar innehållade orden drag reduction.

  1. 26. Time, space and control: deep-learning applications to turbulent flows

    Författare :Luca Guastoni; Ricardo Vinuesa; Hossein Azizpour; Philipp Schlatter; Andrea Beck; KTH; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; turbulence; deep learning; deep reinforcement learning; flow control; turbulens; djupinlärning; djupförstärkningsinlärning; flödeskontroll; Teknisk mekanik; Engineering Mechanics;

    Sammanfattning : In the present thesis, the application of deep learning and deep reinforcement learning to turbulent-flow simulations is investigated. Deep-learning models are trained to perform temporal and spatial predictions, while deep reinforcement learning is applied to a flow-control problem, namely the reduction of drag in an open channel flow. LÄS MER

  3. 27. Numerical study of transport phenomena in particle suspensions

    Författare :Mehdi Niazi Ardekani; Luca Brandt; Gianluca Iaccarino; KTH; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Engineering Mechanics; Teknisk mekanik;

    Sammanfattning : Suspensions of solid particles in a viscous liquid are of scientific and technological interest in a wide range of applications. Sediment transport in estuaries, blood flow in the human body, pyroclastic flows from volcanos and pulp fibers in papermaking are among the examples. LÄS MER

  4. 28. Of Pipes and Bends

    Författare :Jacopo Canton; Philipp Schlatter; Ramis Örlü; Dwight Barkley; KTH; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; nonlinear instability; bifurcation; flow control; Engineering Mechanics; Teknisk mekanik;

    Sammanfattning : This work is concerned with the transition to turbulence of the flow in bent pipes, but it also includes an analysis of large-scale turbulent structures and their use for flow control.The flow in a toroidal pipe is selected as it represents the common asymptotic limit between spatially developing and helical pipes. LÄS MER

  5. 29. Rhythm in late-modern Stockholm : Social stratification and stylistic variation in the speech of men

    Författare :Nathan Joel Young; Devyani Sharma; Erez Levon; Paul Kerswill; Nicolai Pharao; United Kingdom University of London Queen Mary; []
    Nyckelord :HUMANIORA; HUMANITIES; Rinkeby Swedish; Speech Rhythm; nPVI; multiethnolect; sociophonetics; Phonetics; fonetik;

    Sammanfattning : Denna avhandling visar att talrytm är socialt stratifierad i vardagsspråket hos män i Stockholm. Som ett symboliskt centrum för många senmoderna sociala förändringar är Stockholm också hemvist för Europas ”första” multietnolekt (rinkebysvenska, Kotsinas 1988a). LÄS MER

  7. 30. Water diffusion and free volume in hydrophilic polymers

    Författare :Charlotte Trotzig; Centrum för analys och syntes; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Physical chemistry; free volume; self-diffusion; degree of crystallinity; glass transition temperature; tensile storage modulus; surface tension; isotherm; HPMC; PEO; water; triacetin; clay; Macromolecular chemistry; dynamic mechanical analysis; Fysikalisk kemi; differential scanning calorimetry; nuclear magnetic resonance; positron annihilation; Makromolekylär kemi;

    Sammanfattning : During moisture uptake in polymers, the diffusion of the water molecules is believed to occur via unoccupied voids. These voids are called free volume cavities and their sizes are continuously altered when the moisture content in the polymer is enhanced. LÄS MER