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Under-Relaxation reduces solution oscillations and helps to keep the computation stable. After each iteration, at each cell, a new value for variable 140 in cell 149 is then updated using following equation:


where 151 is under-relaxation factor. The choice 151 img153 152 corresponds to no under-relaxation. The choice 151 40 152 is under-relaxation. This may slow down speed of convergence but increases the stability of the computation, i.e. it decreases the possibility of divergence or oscillations in the solution. For more details see e.g. [3].