How to solve demanding fluid dynamics problems in comsol?
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Computational fluid dynamics (CFD) is the rapidly evolving science of numerically solving the equations of fluid motion to produce quantitative predictions and/or analyses of fluid flow phenomena. When used appropriately, CFD is often ideal for parametric studies or flow-physics investigations that would otherwise be impractical or impossible via entirely theoretical or experimental efforts. The two dominant approaches to CFD are the finite-difference and finite-volume or -element formulations. In both cases, CFD involves discretizing the spatial domain into a grid or mesh of points or elements, and marching the numerical solution forward in discrete time steps. In the finite difference formulation, individual derivative terms in the equations of motion are written in terms of field-value differences determined at or between the grid of mesh points and the resulting system of algebraic equations is solved numerically. In the finite-volume or -element formulation, the equations of motion are solved within small elements that together cover the spatial domain of interest with the matching conditions between elements leading to a system of algebraic equations that is solved numerically. Depending on the flow conditions, different approaches to discretization and time marching may be preferred.
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