# Residual-Based Newton Raphson Strategy

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 Revision as of 22:32, 21 March 2016 (view source)Cpuigbo (Talk | contribs) (Created page with "''' Input Data ''' For all strategies, the common input data are: # Model Part. # Time Scheme. # Convergence Criteria. # Flags Like: ## CalculateReactionFl...") Revision as of 22:03, 22 March 2016 (view source)Cpuigbo (Talk | contribs) Newer edit → Line 1: Line 1: − ''' Input Data ''' + ''' Constructor Main Data ''' + Solution strategy for Non-Linear analysis. − For all strategies, the common input data are: + The usual common data is required in the + constructor for the Newton Rapshon Strategy: + + #  Model Part + #  Time Integration Scheme (Newmark, Bossak, ...) + #  Convergence Criterion (Residual, Displacements, ...) + #  Linear Solver (Direct, Iterative, ...) + #  Builder and Solver + #  Maximum Number of Iterations (default 30) + #  Common Flags: (false by default) + ##    CalculateReactionFlag (compute reactions) + ##    ReformDofSetAtEachStep (check and change the dofs at each step) + ##    MoveMeshFlag (update the coordinates of the nodes at each step) − #  Model Part. − #  Time Scheme. − #  Convergence Criteria. − #  Flags Like: − ##    CalculateReactionFlag. − ##    ReformDofSetAtEachStep. − ##    MoveMeshFlag. − #  Linear Solver. − − For this strategy the parameters are: + If the maximum number of iterations is reached, the last result is taken as converged and the analysis keeps on running. When this happens and the analysis does not crash, the accuracy of the results will be very low and we recommend to not trust it. − + − # Maximum Newton Rapshon Iterations. + − # Tolerancia, by default 1.0E-9. + − # Norma, by default  1.0E-6. +

## Revision as of 22:03, 22 March 2016

Constructor Main Data

Solution strategy for Non-Linear analysis.

The usual common data is required in the constructor for the Newton Rapshon Strategy:

1. Model Part
2. Time Integration Scheme (Newmark, Bossak, ...)
3. Convergence Criterion (Residual, Displacements, ...)
4. Linear Solver (Direct, Iterative, ...)
5. Builder and Solver
6. Maximum Number of Iterations (default 30)
7. Common Flags: (false by default)
1. CalculateReactionFlag (compute reactions)
2. ReformDofSetAtEachStep (check and change the dofs at each step)
3. MoveMeshFlag (update the coordinates of the nodes at each step)

If the maximum number of iterations is reached, the last result is taken as converged and the analysis keeps on running. When this happens and the analysis does not crash, the accuracy of the results will be very low and we recommend to not trust it.