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The discretization resolution can also be tuned to the problem at hand to ensure the system can be solved with reasonable computational effort. An example would be compressible flow, where the density of the fluid varies in space and with flow rate. Why is meshing needed in CFD problems? In addition to converting complex differential equations into simpler arithmetic problems, discretization allows a simulation to account for changes in continuous physical properties across the solution domain.
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The technique that is chosen can then be used to define grid points along the surface (for 2D or boundary element method problems) or inside the volume (for 3D problems) of the system. Grid generation in CFD simulations involves choosing a mathematical technique to represent the arrangement and spacing between each node in the numerical grid for your system. Using the right grid generation tools, automation and templatization are put in place to ensure that the required expertise and time commitment can be minimal while still ensuring the utmost accuracy in your mesh. The grid that is selected for CFD simulations will define the accuracy and resolution of the simulation results, both of which will affect the computation time and level of detail in the results. Grid generation in CFD refers to a set of techniques for defining a numerical mesh throughout the system to be simulated. When generating meshes for these simulations, it’s your job to understand how discretization in a numerical model influences accuracy and what you’ll be able to observe in your results. Therefore, it’s important to have some knowledge of numerical methods as well as how they are executed in computational simulation. However, as a working engineer, you can’t work out every problem by hand. Numerical methods for solving partial differential equations are advanced topics not normally taught in undergraduate engineering classes. More advanced meshing techniques do not use Cartesian or structured grids, instead, they apply polynomial curves and interpolation schemes to generate the mesh and results. The grid generation method that is used in a problem will try to match the mesh to the geometry of the system being simulated. Mesh generation in CFD simulations plays the same role as meshing in finite element simulations, where discretization will determine the accuracy and computation time in the simulation.