Essays about: "friction drag"

Showing result 1 - 5 of 17 essays containing the words friction drag.

1. 1. Active flow control of the turbulent boundary layer over a NACA4412 wing profile for skin friction drag reduction

   University essay from KTH/Teknisk mekanik

   Author : Giacomo Semprini Cesari; [2023]
   Keywords : Active flow control; drag reduction; numerical simulations; turbulent boundary layer; wings;

   Abstract : In the context of building a framework for active flow control of turbulent boundary layers in wings, a set of large-eddy simulation (LES) are implemented in OpenFOAM. The flow around a NACA4412 wing profile is simulated at 5° angle of attack and Re_c = 400˙000. READ MORE

3. 2. Shallow Water : A comparison between hydraulic measurements and numerical models

   University essay from Luleå tekniska universitet/Institutionen för teknikvetenskap och matematik

   Author : Dan Nilsson; [2023]
   Keywords : CFD; Surface Roughness; Manning coefficient; Hydropower;

   Abstract : In the near future hydropower will be used to regulate intermittent energy sources, shallow water ways can then occur in close proximity to the power plants, where the bottom often consists of stones in a similar length scale as the water depth. The idea of this project, which has been initiated by Vattenfall R\&D, is to compare experimental measurements in a laboratory environment with numerical simulations with CFD, this to find a way to represent roughness structures where there is low relative submergence. READ MORE

4. 3. Phosphonium Ionic Liquids at Interfaces: NR studies of interfacial electro-responsiveness

   University essay from KTH/Kemi

   Author : Filip Mehler; [2022]
   Keywords : Neutron reflectometry; Ionic liquid; Phosphonium Ionic Liquid; Tribology; Neutronreflektometri; Jonvätskor; fosfoniumjonvätskor; tribologi;

   Abstract : Fosfoniumjonvätskor har tidigare studerats som potentiella nya avancerade smörjmedel på grund av sina unika fysikaliska egenskaper och fördelar jämfört med både traditionella smörjmedel och andra typer av jonvätskor. Dessa studier har uppvisat lovande resultat med avseende på reducering av nötning och friktion såväl som kontroll av dessa parametrar med en pålagd elektrisk potential. READ MORE

5. 4. The influence of post-buckling damage on the tensile properties of single wood pulp fibers

   University essay from KTH/Hållfasthetslära

   Author : Raphael Andreolli; [2021]
   Keywords : Solid Mechanics; single fiber testing; wood pulp fibers; post-buckling damage; experiments; development of testing methods; tensile properties; tensile stiffness; tensile strength; Hållfasthetslära; enskild fiber testning; pappersmassa fiber; skada efter knäckning; experiment; utveckling av testutrustning; dragegenskaper; dragstyvhet; draghållfasthet;

   Abstract : The rapid growth of plastic waste from food packaging around the world demands renewable substitutes, such as natural fibers and biocomposites. Wood fibers are natural fibers extracted from trees and are commonly used in packaging. READ MORE

6. 5. Surf Simulation with the Shallow Water Equations : Coupling of a surfer model to a shallow water wave

   University essay from KTH/Skolan för teknikvetenskap (SCI)

   Author : Anton Thorell; [2021]
   Keywords : ;

   Abstract : This thesis covers the subject of deriving and solving the system of partial differential equations known as the Shallow Water Equations (SWE), and coupling the solutions of this equation system to a simplified model of a surfer - or any floating object, with the right choice of parameters. The SWE are generally used to analyze fluid movement on shallow areas, such as ocean waves nearing the shore, and are derived from the Navier-Stokes equations and restricted to conservation of mass and momentum in a fluid. READ MORE