Sökning: "numerisk strömningsmekanik"

Visar resultat 1 - 5 av 7 uppsatser innehållade orden numerisk strömningsmekanik.

1. 1. LES modelling of spray combustion

   Master-uppsats, Lunds universitet/Institutionen för energivetenskaper

   Författare :Arvid Åkerblom; [2021]
   Nyckelord :Gas Turbine; CFD; Large Eddy Simulation; Lagrangian Particle Tracking; Chemical Kinetics; Reaction Mechanism; Combustion; OpenFOAM; CHEMKIN; Technology and Engineering;

   Sammanfattning : Computational fluid dynamics is a powerful method for understanding the flow and combustion that occurs inside aircraft engines and will be a key tool in the transition from conventional fossil-based fuel to sustainable alternatives. Because conventional fuels have been more widely researched, an attempt at simulating the combustion of alternative fuels should be preceded by the development of a method that is capable of accurately simulating the combustion of a conventional fuel. LÄS MER

3. 2. 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

4. 3. Numerical simulation of a rising bubble

   Master-uppsats, KTH/Strömningsmekanik och Teknisk Akustik

   Författare :Nan Huang; [2021]
   Nyckelord :Multiphase flows; numerical simulations; Strömningsmekanik; flerfas strömningar;

   Sammanfattning : This thesis evaluates two variants of Volumeof fluid method, namely Piecewise Linear Interface Construction (PLIC) and Multidimensional Tangent of Hyperbola for Interface Capturing (MTHINC) used in two-fluid simulations for interface tracking.Simulations of a single rising bubble in different conditions are performed aimed to assess the accuracy of the methods, and to check their convergence with grid size. LÄS MER

5. 4. Extensional Instability in Complex Fluids: A Computational Study

   Master-uppsats, KTH/Strömningsmekanik och Teknisk Akustik

   Författare :Muhammed Abdulrazaq; [2020]
   Nyckelord :Complex Fluids; Computational Rheology; Elastoviscoplastic Fluids; Instability.; Komplexa vätskor; Beräkningsreologi; Elastoviskoplastiska vätskor; Instabilitet.;

   Sammanfattning : In this study, instability and failure in complex fluids (Elastoviscoplastic fluids) is explored using the classic Considère (F˙ < 0) and stress curvature (σ¨ < 0) criteria. Employing the Saramito model, numerical simulation of the extensional protocol on non-Newtonian fluids is carried out. LÄS MER

7. 5. Fluid/Material Coupled Numerical Analysis of Single Bubble Collapse Near a Pit on a Wall

   Master-uppsats, KTH/Strömningsmekanik och Teknisk Akustik

   Författare :Daiki Makii; [2020]
   Nyckelord :Bubble Dynamics; Cavitation Erosion; Numerical Analysis; Fluid Material Coupled Numerical Method; Homogeneous Model; Elastic Body Material; Erosion Pit;

   Sammanfattning : In order to elucidate the progression mechanism of cavitation erosion, the behaviors of a single cavitation bubble collapse near a pit on a wall and both the resulting pressure wave in fluid and stress wave in material are investigated in detail. To find out the mechanism of cavitation erosion, many experimental studies on the bubble collapse behavior near a flat rigid wall and the resulting material damage have been conducted so far. LÄS MER