Sökning: "gränsskikt"

Visar resultat 1 - 5 av 36 uppsatser innehållade ordet gränsskikt.

1. 1. Insights Into Wind Profile Characteristics in the Arctic Marine Boundary Layer

   Master-uppsats, Uppsala universitet/Luft-, vatten- och landskapslära

   Författare :Charlotte Sophie Gausa; [2024]
   Nyckelord :Arctic; wind profile power law; MOST; boundary layer; low level jets; sea ice; vindprofil; Arktis; gränsskikt; vindenergi; låghöjdsvindar; havsis;

   Sammanfattning : The atmospheric boundary layer in the Arctic is essential for the understanding of climate change and improving regional weather prediction. The aim of this study is to investigate to which degree wind speed profiles retrieved in the Arctic agree with well known wind profile concepts and understand which local impact factors influence the wind speed profile. LÄS MER

3. 2. A Comparison of Statistical Methods to Generate Short-Term Probabilistic Forecasts for Wind Power Production Purposes in Iceland

   Master-uppsats, Uppsala universitet/Luft-, vatten- och landskapslära

   Författare :Arnór Tumi Jóhannsson; [2022]
   Nyckelord :Wind power; Iceland; Atmospheric Boundary Layer; atmospheric stability; probabilistic forecasting; Machine Learning; Quantile Regression Forest; Vindkraft; Island; gränsskikt; atmosfärisk stabilitet; probabilistisk prognos; Machine Learning; Quantile Regression Forest;

   Sammanfattning : Accurate forecasts of wind speed and power production are of great value for wind power producers. In Southwest Iceland, wind power installations are being planned by various entities. LÄS MER

4. 3. Higher Forms and Dimensional Hierarchy in Topological Condensed Matter

   Master-uppsats, KTH/Fysik

   Författare :Yashar Honarmandi; [2022]
   Nyckelord :Theoretical physics; topological quantum matter; parametrized systems; Berry phase; higher Berry curvature; effective field theory; topological action; topological insulators; dimensional hierarchy; Teoretisk fysik; topologisk kvantmateria; parametriserade system; Berryfas; högre Berrykrökning; effektiv fältteori; topologisk verkan; topologiska isolatorer; dimensionshierarki;

   Sammanfattning : This report discusses higher differential forms with applications in the study of topological phenomena. The integer quantum Hall effect is first discussed, demonstrating a connection between models on a lattice and quantum field theories bridged by a topological invariant, namely the Chern number. LÄS MER

5. 4. Deep learning for non-intrusive sensing in turbulence with passive scalars

   Master-uppsats, KTH/Strömningsmekanik och Teknisk Akustik

   Författare :Arivazhagan Geetha Balasubramanian; [2021]
   Nyckelord :Turbulent boundary layer; passive scalar; direct numerical simulation; Prandtl number; Machine learning; convolutional neural network; Turbulent gränsskikt; passiv skalär; direkt numerisk simulering; Prandtl-nummer; maskininlärning; faltningsneurala nätverk;

   Sammanfattning : The near-wall modelling of turbulent flows has been an active field of research due to the computational cost associated with the direct numerical simulations of such flow, which are characterized by a wide range of length and time scales. With the recent advancements in technological capabilities, the availability of high-fidelity data has enabled the construction of data-driven approaches to model turbulence. LÄS MER

7. 5. Development and validation of an improved wall-function boundary condition for computational aerodynamics

   Master-uppsats, KTH/Strömningsmekanik och Teknisk Akustik

   Författare :Carlo Loris Palombo; [2021]
   Nyckelord :Wall Functions; Wall Treatment; M-Edge; Computational Fluid Dynamics; Turbulent Boundary Layer; Turbulence Models; Väggfunktionsranvillkor; M-Edge; Strömningsmekaniska beräkningar; Turbulent Gränsskikt; Turbulensmodeller;

   Sammanfattning : Computational Fluid Dynamics is a powerful and widely used tool for developing projectsthat concern flow motion, in very different fields. Industrial CFD solvers are continuouslydeveloped with the aim of improving accuracy and reducing the computational cost of thesimulations. LÄS MER