Description The flow focusing device is a device that consists of three entrances and on exit, where typically two opposing lateral fluid streams shape a third inlet stream, generating a converging flow region similar to that obtained in smooth contractions with moving walls. Using this configuration we are capable of generating extensional flows with nearly constant strain rate at the centreline, which is very interesting for studying cell and droplet behaviour as well as for producing microfibres using microfluidic spinning. In microfluidic spinning, the control of the ratio of the flow rates of the various streams is key to obtain the desired flow behaviour and features depending on the application. In this project, you will be setting up and performing numerical simulations to characterise the flow through a flow focusing device using computational fluid dynamics, with particular emphasis on the effect of geometrical parameters as well as the flow rate ratio.   Key Objectives Perform a literature survey on extensional flows Mesh the selected geometries with different levels of refinementPerform numerical simulations using a CFD software (OPENFOAM or ANSYS or STAR-CCM+)Validate the numerical results by comparison with data available in the literatureAnalyse the flow field and evaluate the effect geometric and hydrodynamic parameters, as well as viscosity ratio and flow rate ratio.