Residual-Based Newton Raphson Strategy

(Difference between revisions)
 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...") Latest revision as of 01:03, 24 March 2016 (view source)Cpuigbo (Talk | contribs) (4 intermediate revisions by one user not shown) Line 1: Line 1: − ''' Input Data ''' + ''' Definition ''' + Implicit solving strategy for Non-Linear analysis. − For all strategies, the common input data are: + ''' Constructor Main Data ''' − + − #  Model Part. + − #  Time Scheme. + − #  Convergence Criteria. + − #  Flags Like: + − ##    CalculateReactionFlag. + − ##    ReformDofSetAtEachStep. + − ##    MoveMeshFlag. + − #  Linear Solver. + + + 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) + − 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. + [[Category:Solid Mechanics Application]] − # Tolerancia, by default 1.0E-9. + [[Category:Solid Mechanics Application Strategies]] − # Norma,  by default  1.0E-6. +

Latest revision as of 01:03, 24 March 2016

Definition

Implicit solving strategy for Non-Linear analysis.

Constructor Main Data

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.