Sökning: "Computational Fluid Dynamics CFD"

Visar resultat 26 - 30 av 308 avhandlingar innehållade orden Computational Fluid Dynamics CFD.

1. 26. Numerical computations of wind turbine wakes

   Författare :Stefan S. A. Ivanell; Dan Henningson; Peinke Joachim; KTH; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Actuator Line Model; Actuator Disc Model; Wind Turbine Wake; CFD; LES; EllipSys3D; Fluid mechanics; Strömningsmekanik;

   Sammanfattning : Numerical simulations of the Navier-Stokes equations are performed to achieve a better understanding of the behaviour of wakes generated by wind turbines. The simulations are performed by combining the in-house developed computer code EllipSys3D with the actuator line and disc methodologies. LÄS MER

3. 27. CFD Modelling of a Free-Piston Engine Using Detailed Chemistry

   Författare :Miriam Bergman; Chalmers tekniska högskola; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; free-piston; combustion; Diesel; compression ignition; chemical kinetics; HCCI; Computational Fluid Dynamics;

   Sammanfattning : The Free Piston Engine, FPE, which is capable of operating in a variable compression ratio mode, is highly suitable for the promising Homogeneous Charge Compression Ignition (HCCI) concept, allowing flexible auto-ignition control on a cycle-to-cycle basis without any hardware modifications. In this study, the effects of varying the start of injection on the emission formation and efficiency of such an engine have been investigated, using simulations based on the KIVA-3V CFD code. LÄS MER

4. 28. Computational fluid dynamics for detention tanks : simulation of flow pattern and sedimentation

   Författare :Åsa Adamsson; Chalmers tekniska högskola; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; sanitary engineering; tracer study; CFD; flow patter; sedimaentation; bed shear stress; detention tank; storage tank; numerical simulation;

   Sammanfattning : .... LÄS MER

5. 29. Methods for Reducing the Complexity of Geometrical Structures Based on CFD Programming : Time Efficient Simulations Based on Volume Forces Coupled with Single and Two-phase Flow

   Författare :Kamal Rezk; Lars Nilsson; Jonas Berghel; Erik Dahlquist; Karlstads universitet; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Numerical design cycle; CFD; porous media; volume forces; heat exchanger; vacuum dewatering; time efficient simulations; Miljö- och energisystem; Environmental and Energy Systems;

   Sammanfattning : Throughout recent years, computer based programs have been applied to solve and analyse industrial problems encountered global fields such as automobile design for reduction of CO2-gas, designing wind parks aimed at increasing power output etc. One of these developed programs is Computational Fluid Dynamics (CFD) which numerically solves complex flow behaviour based on computer power. LÄS MER

7. 30. Computational studies of flow in Couette Rheometer and particle interaction in non-Newtonian fluids

   Författare :Naser Hamedi; Strömningsteknik; []
   Nyckelord :Non-Newtonian fluids; Correction factor; Fluid properties; Couette Rheometer; Particle interaction; Sedimentation; Computational Fluid dynamics; Plug flow; Herschel Bulkley; Power-law fluid; Immeresed boundary method;

   Sammanfattning : This work aims to study the flow of non-Newtonian fluids and has two main goals. First, the power-law and Herschel Bulkley fluids are studied in a Couette rheometer. Second, the static and dynamic interaction of dual particles in power-law fluid are investigated. LÄS MER