Hi,
Under-relaxation factors are a method used in computational fluid dynamics (CFD) to regulate the pace at which a solution converges to a steady state. These parameters are used to attenuate or slow down the updating of certain variables in each solver iteration. This can aid in the stabilisation of the convergence process and, in certain situations, the improvement of convergence behaviour.
The selection of an under-relaxation factor is frequently problem-dependent and necessitates some trial and error. It's a balance between convergence speed and stability.
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