Bubble dynamics inside a compliant blood vessel Strongly coupled FSI on a dynamic wedge mesh

Abstract In medical applications, ultrasound is no longer used exclusively for diagnostical purposes but also in a more intense and highly focused modification (HIFU) for interventional applications such as tumor treatment The goal of our present work is to develop a microscale model of the interaction between gas-filled microbubbles, blood and the respective blood vessel walls. A partitioned multi region black box interaction system that can accommodate the respective physical models for each region is envisaged (see The solver used for modeling the blood-wall interaction is based on icoFsiFoam (available in OF-1.5-dev) which provides interface coupling and dynamic mesh motion. Because the density ratio of blood and vessel wall is very close to unity, the components of the system show strong mutual influence and a strong coupling scheme has to be employed The bubble is represented in our model by the respective boundary of the fluid region (see Currently, we are running our calculations on a wedge mesh (see We kindly acknowledge the financial support of the Swiss National Science Foundation through NCCR Co-Me

Computational Fluid Dynamics of Dispersed Two-Phase Flows at High Phase Fractions

Abstract The two-phase flow in the finger pipe of a finger-type slug catcher is analysed using CFD techniques. The purpose of a finger-type slug catcher is to separate the liquid condensate from the natural gas. In order to design a high performance finger-type slug catcher, it is necessary that the fluid flow in the inlet header manifold is evenly distributed among the different fingers Here v t is the settling velocity of particles of a specified diameter. Different inlet header manifold configurations are defined and compared using the time-averaged mass flow at the finger inlets. A constant and increased pipe diameter was found to promote the mass flow balance. Additionally, by applying an extra split in the main header pipe, the equal flow distribution is significantly increased, see When the fluid flow in the inlet header manifold is evenly distributed among the different fingers, it is necessary to obtain stratified flow to promote liquid separation. The two-phase flow in the separation section is simulated to study the amount of liquid at the intersection with and through the gas riser, se