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Meshing is the process of converting a continuous object, which contains infinite degrees of freedom into several smaller and discrete elements with well-defined degrees of freedom to perform simulations.
A finer mesh produces more accurate results. This is because the more minor elements in the mesh help capture the gradients across the shape more accurately and easily. However, adding more elements to the mesh can increase costs computationally.
A convergence study can be helpful when meshing for both FEA and CFD. After the simulation, the results are converged and then used in meshing, which reduces the mesh size.
The geometry represented in the analysis determines the element shape that is to be used for meshing. In the case of highly complex geometry, tet elements are used. The geometry is divided into smaller parts before using hex elements. But, this increases the time of analysis.