Computational fluid dynamics calculator4/15/2023 To understand how to run valid CFD simulations, and get the most out of your analysis, it’s important to understand uncertainty and error. NASA has an excellent description of the difference between these two issues. Often, it is most important to understand the basic behavior of the flow as your product changes, as opposed to getting the "exactly right answer." Perhaps the largest benefits of CFD are realized when it is used to comparatively test many design iterations, without the need for costly physical prototypes at each step. To prevent misleading results, users of CFD need to start with a firm understanding of the underlying physics, and the limitations of the simulation tool. If a CFD analysis is not set-up correctly, it can produce convincing results that are actually wrong. However, to be effective the CFD user, like the FEA user, requires experience and training. If done correctly, this process yields extremely useful information on the flow characteristics of various design options ( read some of NASA’s process for CFD). The software iterates these equations over the entire simulation model until an unchanging (converged) solution is attained. CFD simulation works by iteratively solving mathematical approximations of the Navier-Stokes and Energy Equations to reach the solution. Kawaguti spent 20 hours a week for 18 months to hand-calculate the flow around a cylinder. This problem can now be solved in minutes using CFD on readily accessible computing hardware.ĬFD can in some ways be viewed as the fluid version of FEA in that it works by breaking up the problem space into discreet chunks (the mesh), applying materials and boundary conditions to each of these pieces, and solving them together numerically. Computational Fluid Dynamics (CFD) is the industry standard method for simulating the flow of gasses and liquids both through and around solid bodies (think of the flow around a car, or through a faucet).Įven the simplest of these fluid flow problems are prohibitively complicated to solve for by hand.
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