*SOLU
i1, r1, r2
i1: i*4: max number of iterations. Default 30
r1: r*8: residual tolerance. Default 1.d-2
r2: r*8: max residual. Default 1.d20
This card controls the Newton-Raphson solver. If the solution does not converge within i1 iterations at any given time step, the time step size will be reduced and the solver will cutback. Once the residual is smaller than r1 the simulation will continue to the next time step. If the max residual exceeds r2, the analysis will be automatically terminated.