Sökning: "turbulence"

Visar resultat 6 - 10 av 444 uppsatser innehållade ordet turbulence.

1. 6. On intermittency in the turbulent asymptotic suction boundary layer

   Master-uppsats, KTH/Skolan för teknikvetenskap (SCI)

   Författare :Edoardo Foschi; [2023]
   Nyckelord :Turbulence; turbulent boundary layer; intermittency; numerical simulation; DNS; tripping; suction;

   Sammanfattning : This thesis presents a series of direct numerical simulations (DNS) performed in order to understand the discrepancy in the literature regarding turbulent asymptotic suction boundary layers (TASBLs) at low Reynolds numbers. The hypothesis to be tested is that the main reason for higher turbulence intensities observed in experiments compared to DNS is that the latter exhibits intermittent patches of laminar flow, developing both temporally and spatially. LÄS MER

3. 7. Modeling of the trajectory of ice thrown from a wind turbine

   Master-uppsats, Lunds universitet/Institutionen för energivetenskaper

   Författare :Elena Rocchi; [2023]
   Nyckelord :Ice thrown - Ice fall - RANS - LES - CFD - simulations - ballistic model; Technology and Engineering;

   Sammanfattning : There is a growing number of wind turbines installed in cold temperature zones as a result of the restricted space for new construction. Due to ice deposition on the turbine blades, the increasing installation of wind turbines in freezing temperature areas presents many challenges: ice accumulation increases weight, unbalances the rotor, diminishes aerodynamic efficiency, and creates safety issues. LÄS MER

4. 8. Methods and Purposes of Aerodynamic Correlation in Formula Student

   Master-uppsats, Lunds universitet/Institutionen för energivetenskaper

   Författare :Alix Le Bastard; [2023]
   Nyckelord :Technology and Engineering;

   Sammanfattning : This thesis investigates how methods of aerodynamic validation can assist a formula student team in designing their aerodynamic package. When de- signing their aerodynamic components, formula student team mostly rely on CFD software simulations, but there is no guarantee that the simulations de- pict properly the physical behaviour of the airflow around the car. LÄS MER

5. 9. Kapitalstruktur i turbulenta tider: En studie av Covid-19:s effekt på företags kapitalstruktur

   Kandidat-uppsats, Lunds universitet/Företagsekonomiska institutionen

   Författare :Fredrik Bjerrek; Simon Meden; Jonathan Åblad; [2023]
   Nyckelord :Kapitalstruktur; Covid-19; Debt to Assets; Ekonomisk kris; Storbritannien; Business and Economics;

   Sammanfattning : Sammanfattning Examensarbetets titel Kapitalstruktur i turbulenta tider: en studie av Covid-19:s effekt på företags kapitalstruktur Seminariedatum 2023-06-01 Kurs FEKH89 – Examensarbete i finansiering på kandidatnivå Författare Fredrik Bjerrek, Simon Meden och Jonathan Åblad Handledare Anamaria Cociorva Nyckelord Kapitalstruktur, Covid-19, Debt to Assets, Ekonomisk kris, Storbritannien Forskningsfråga Har Covid-19-pandemin påverkat företags kapitalstruktur? Syfte Studien syftar till att undersöka huruvida den ekonomiska kris som följde Covid-19-pandemin har påverkat företags kapitalstruktur i form av skuldsättning. Metod Studien följer en kvantitativ forskningsmetod och bygger på linjära regressionsanalyser av data inhämtad från Bloomberg-terminalen. LÄS MER

7. 10. Investigation of different ventilation profiles to avoid stratification in Nearly Zero Energy Buildings

   Magister-uppsats, Högskolan i Gävle/Energisystem och byggnadsteknik

   Författare :Alazne Irene Varela Santana; [2023]
   Nyckelord :stratification; water model; comfort; mixing; temperature; potential energy; net zero energy building;

   Sammanfattning : This research paper examines possible solutions for the problems that warm air heating is suffering in Nearly Zero Energy Buildings. These NZEBs are passive houses constructed to have high energy efficiency where the quantity of power used is equal to the power created annually, produced locally or in the surroundings by renewable energy sources. LÄS MER