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control_relaxation_materi_velocity index group_materi_velocity_relaxation

Relaxation parameters for velocity. This parameter only enters the left hand side of the iterative scheme. If enough iterations are used (see control_timestep_iterations), the parameters do not influence the final results.

The control_relaxation ... options add 'stiffness' to the left hand side of the equations, and so stabilize the iterations. Another possibility is to use options_relaxation which reduces iterative changes to the unknowns.

tochnog 2001-09-02