Numerical study of the sedimentation of particle suspensions in ducts

Sedimentation of particle suspensions is a relevant process to a variety of applications, such as the reclamation of land and chemical engineering systems. Direct numerical simulations of the settling of a single, two and multiple solid spheres under gravity in a square duct have been performed. The simulations involve 4 different Galileo...

Strain Softening: Linear and nonlinear response of weakly attractive soft particles

Emulsions and foams are commonly found in products made by industries ranging from those<br/>associated with food and pharmaceuticals to those involved in selling personal care products.<br/>This work is motivated by the need for accurate models of their mechanics, which can then be<br/>used for efficient processing.<br/><br/>They can be thought...

The characterization of uncertainty for steady state multiphase flow models in pipelines

Steady state multiphase flow models are used for the design and operation of pipelines that are used in the oil and gas industry. The predictions obtained with these models contain uncertainties, which arise from model assumptions and simplifications, and from uncertainties in the input parameters. In this thesis we investigate the effect of...

Simulations for an expanding gas jet with Joule-Thomson cooling

This study was aimed at improving the accuracy of the model predictions for the minimum fluid and inner wall temperatures for cold, low-pressure start-up of wells that produce oil or gas. Due to the large pressure drop over the well head choke, the so-called Joule-Thomson cooling will give a very low temperature of the<br/>expanding gas jet. Low...

Numerical analysis of blood flow patterns in simplified aortic root with prescribed valve kinematics

The aortic valve is a valve made of three thin flexible leaflets which open and close in order to allow the unidirectional passage of blood from the left ventricle to the aorta. Because of this repetitive motion at each cycle, the valve is constantly exposed to large variations of pressure and hemodynamic forces. Deterioration in its peculiar...