Numerical study of solidifying molten metal droplet impingement on a cold solid surface: The effect of thermocapillary forces

Metallic droplet deposition is of interest in the industry because of the potential use in additive manufacturing. This work discusses the complex phenomena involved in droplet impingement, especially the effect of temperature dependant surface tension. The volume of fluid (VOF) method is used to solve the axis-symmetric Navier-Stokes equations,...

Convolution in Multiphase Flow Simulations: Improving Interface Curvature Estimations

The accurate approximation of the surface tension force is paramount for continuum surface models in the field of computational fluid dynamics for multiphase flow where surface tension is relevant. This involves being able to accurately calculate the curvature at the interface. This study focuses on the use of convolution in smoothing the VOF...

Mobile CFD solving: Solving natural convection problems in real time

We have explored the concept of mobile computational fluid dynamics (CFD) solving. Using the computational<br/>power of a smartphone we tried to generate real time simulations of relatively simple transient natural<br/>convection problems in the laminar regime. The focus lies on finding a compromise between accuracy, speed<br/>and stability: we...

Numerical Simulation of Dispersion in Stratified Porous Media

The transport of a solute dissolved in a fluid flowing trough porous media is, next to advection and diffusion, determined by hydrodynamic dispersion. This be- haviour is commonly characterized using the longitudinal and transverse dispersion coefficients. Laboratory and field measurements of these coefficients tend to differ, which might be...

The Interaction Between Two 2D Rarefied Vapor Jets

Steel is commonly coated to protect it from corrosion. One method of applying this is by using Physical Vapor Deposition, which can be done by using multiple jets. In this process jets next to each other interact. This paper's main aim is to investigate the interaction effect of two rarefied two-dimensional vapor jets in vacuum and how this is...

Side-heated natural convection in coarse-grained porous media: An experimental study

This MSc thesis reports on an experimental study performed to test the effects of packed beds of relatively large spheres on natural convection inside a cubical enclosure which is heated from the left side and cooled from the right side. With ’relatively large’, a ratio of L/D=5 is meant where L is the length between the hot and cold plate and D...

Numerical Analysis on Hemodynamics in Intracranial Aneurysms: Proposing a third hemodynamic criterion for predicting rupture sites

Brain aneurysms cause almost 500,000 deaths in the world every year. A better understanding of brain aneurysm genesis and rupture may open new opportunities to prevention and treatment. In this study, a part of the cerebral vascular system, the so called circle of Willis including an aneurysm, was analyzed with Computational Fluid Dynamics (CFD)...