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A template for a typical Stokes Solver sif-entry:
Solver 1
Equation = "Navier-Stokes"
Stabilization Method = String Bubbles
Flow Model = Stokes
Linear System Solver = Direct
Linear System Direct Method = umfpack
Nonlinear System Max Iterations = 100
Nonlinear System Convergence Tolerance = 1.0e-5
! first 5 iterations or convergence < 1.e-2 before moving from
! Picard to Newton
Nonlinear System Newton After Iterations = 5
Nonlinear System Newton After Tolerance = 1.0e-02
Nonlinear System Relaxation Factor = 1.00
! reset newton to false each new time step
Nonlinear System Reset Newton = Logical True
Steady State Convergence Tolerance = Real 1.0e-3
End
The Newton linearisation gives a quadratic convergence whereas Picard is linear, at least some Picard iterations are however required.