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Computational Fluid Dynamics (CFD) involves the numerical analysis and solution of fluid flow problems using computers. It applies the principles of physics, particularly the Navier-Stokes equations, to simulate and predict fluid behavior in various systems. This field is closely related to mechanical engineering as it is often used to analyze and optimize the performance of engines, turbines, pumps, and other mechanical systems where fluid flow plays a critical role. CFD can also be applied to scientific research in areas such as aerodynamics, hydrodynamics, and heat transfer, making it an essential tool for physicists and engineers alike. It provides valuable insights into complex fluid phenomena that would otherwise be difficult or impossible to study through experimental means alone.