Séminaire de Hassan Khawaja

Hassan Khawaja (Department of Automation and Process Engineering, UiT The Arctic University of Norway, Tromsø, Norway)

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Computational Fluid Dynamics - A Stepping-stone of MULTIPHYSICS

The fluids have been around us for as long as we know and they have enabled us to cross the oceans, ride the winds, shorten the distances, and much more.ComputationalFluidDynamics(CFD) has extended our understanding of fluids. Until today, the analytical solution of fundamental equations of fluid mechanics is a million-dollar award (referred to Clay Mathematics Institute). As engineers, let's leave that to mathematicians to claim, but that does not mean that we cannot enjoy the power offered by these equations. Smart numerical techniques developed over the years such as discretization and time-stepping methods have enabled us to solve them with the help of computers. With the increase in computing power, CFD applications are ever-growing, and literally and figuratively, the sky is the limit. The seminar walks through the evolution of CFD and discusses the historical researchers who contributed to its development. Next, the word of caution concerning numerical modeling and the topic of colorful fluid dynamics is discussed. In relatively recent times, CFD is being solved coupled with other physical equations, e.g., thermal conduction (heat equation), electromagnetics (Maxwell's equations), structures (Hooke's law), and more. This has given birth to a new field known as MULTIPHYSICS. This emerging field of science and engineering can be imagined as the coupled mathematical world, where many overlapping and interactive problems of physics are being solved on the fundamental level.
The seminar begins with the introduction of the speaker, a few personal life experiences, and mainly focuses on the evolution and inspiring examples from the speaker’s past work that enlightens the application of CFD as a steppingstone of MULTIPHYSICS. The examples are: micro-fluidic valve, a collaborative project of NUST and CALTECH; CFD DEM simulations of two-phase flow in fluidized beds, a collaborative project of CAMBRIDGE and ETH ZURICH; multiphysics investigation of composite shell structures subjected to water shock wave impact in the petroleum industry, funded by Norwegian Research Council and in collaboration with LILLE University; applied investigation of viscosity- density fluid sensors based on torsional resonators, partially funded by Innosuisse - Swiss Innovation Agency and in collaboration with RHEONICS GmbH and ZHAW; to determine the sensation of ‘cold’ via conjugate heat transfer, a collaborative project with WINDTECH AS.