Solution dialog box (Simcenter Samcef Nonlinear Analysis)

Solution
Name	Sets a name for the solution.
SolverAnalysis TypeSolution Type	Specifies the solver, analysis type, and solution type.
Automatically Create Step or Subcase	Creates a step or subcase automatically.

General page

Foreground Run
Run Job in Foreground	Runs the Simcenter Samcef job run in the foreground.
User-Defined Text
Prolog****Epilog	Specifies the User Defined Text to prepend (Prolog) or append (Epilog) to the solver input file. For more information, see Customizing a Simcenter Samcef input file with user defined text.

Analysis page

Temperature
Default Reference Temperature (.GEL TEMP)	Specifies the reference temperature used to compute thermal strains. For more information, see Reference and Initial Temperatures in Samcef (Simcenter Samcef).
Initial Temperature Definition (.ALGO ITH0)	By default, when you compute thermal strains, the initial temperature (T0) is equal to the Default Reference Temperature (.GEL TEMP). With the Initial Temperature Definition (.ALGO ITH0) property, you can change this default:If you select CLT TIN, T0 is equal to the initial temperature defined in the Initial Temperature load.If you select Structural Reference Temperature, T0 is equal to the Default Reference Temperature (.GEL TEMP).If you select Temperature Field at Time 0, T0 is equal to the temperature of the model computed at the initial time 0 s.For more information, see the ITH0 parameter of the Samcef .ALGO command.For more details on the initial temperature, see Reference and Initial Temperatures in Samcef (Simcenter Samcef).
Time
Restart Time (.ALGO TBEG)	Specifies the restart time. For more information, see the TBEG parameter of the Samcef .ALGO command.
Automatic computation of the size of the first time step (.ALGO FIRSTE)	Select this check box to specify that Simcenter Samcef should automatically compute the size of the initial time step according to several criteria.For more information, see the FIRSTE parameter of the Samcef .SUBCASE command.
The following options appear when you select the Automatic computation of the size of the first time step (.ALGO FIRSTE) check box.
Ideal Size of the Rotation (.ALGO ROTIDE)	Specifies the ideal size of the rotation.For more information, see the ROTIDE parameter of the Samcef .ALGO command.
Ideal Size of the Strain (.ALGO DEFIDE)	Specifies the ideal size of the strain.For more information, see the DEFIDE parameter of the Samcef .ALGO command.
Ideal Ratio VonMises Stress/Yield Stress (.ALGO RAPIDE)	Specifies the ideal ratio between the elastically computed Von Mises stress and the yield stress.For more information, see the RAPIDE parameter of the Samcef .ALGO command.
Maximum number of trials (.ALGO NFIR)	Sets the maximum number of trials to compute the first time step. For more information, see the NFIR parameter of the Samcef .ALGO command.
Geometric Nonlinearities
Geometric Nonlinearities Not Taken Into Account (.SAM NLIS)	By default, the nonlinear solver takes all the nonlinearities into account. If you select the Geometric Nonlinearities Not Taken Into Account (.SAM NLIS) check box, the solver follows a purely linear geometric behavior. The geometrical nonlinearities are not taken into account.If you set proportional damping on the physical properties of the mesh (Solid dialog box), select this check box. Otherwise, when you export, stiffness damping (.AMO ALPHA) is exported to the Samcef input file, but a warning message is issued that .AMO ALPHA is not used by the solver.For more information, see the NLIS parameter of the Samcef .SAM command.
**Strain Limit (.SUB DEFLIM)**Rotation Limit (.SUB ROTLIM)	These lists appear when you select the Geometric Nonlinearities Not Taken Into Account (.SAM NLIS) check box.When you do not take geometric nonlinearities into account, the Simcenter Samcef nonlinear solver stops if strains and rotations exceed specified limits. You can specify these limits in the Strain Limit (.SUB DEFLIM) list and the Rotation Limit (.SUB ROTLIM) list.For more information, see the DEFLIM and ROTLIM parameters of the Samcef .SUBCASE command.
Coupling Option
Coupling (.LIA) Based on	Specifies if the Manual Coupling or Automatic Coupling constraints equations couple nodal displacements or nodal positions.Select Displacement to couple nodal displacements or Position to couple nodal positions.For more information, see the LINK parameter of the Samcef .ALGO command.
Shells and Beams
Compute Curvature for Mindlin Shells and Beams (.ALGO MINO)	Computes the mean normals for Mindlin elements. These mean normals are used to introduce a curvature at the element level. For more information, see the MINO parameter of the Samcef .ALGO command.
Activate Shell Transverse Shear Stiffness Correction for Nonlinear Material (.ALGO SHNL)	For mono-layer shell elements, sets a correction factor for nonlinear materials. If the material remains linear:With the correction factor, the shear stiffness is equal to 5/6 G t.Without the correction factor, the shear stiffness is equal to G t.For more information, see the SHNL parameter of the Samcef .ALGO command.
Threshold Angle (.ALGO SNORM)	Appears when the Compute Curvature for Mindlin Shells and Beams (.ALGO MINO) check box is selected.Specifies the angle value above which the mean normals are not computed. For more information, see the SNORM parameter of the Samcef .ALGO command.
Initial Parameters
Initial Assembly of The Structure	Performs the initial assembly of the structure at the beginning of the computation.For more information, see the MECA parameter of the Samcef .SUBCASE command.
Initial Static Computation (.ALGO IREF)	Forces the Simcenter Samcef nonlinear solver to compute the initial static configuration of the structure.For more information, see the IREF parameter of the Samcef .ALGO command.
Equilibrium with Inertia Force (.ALGO IREF+10)	Forces the equilibrium with inertia force during the initial static computation.For more information, see the IREF parameter of the Samcef .SUBCASE command.
Stiffness Matrix Check and Kinematic Mode Computation (.ALGO KINI)	Performs a check of the model. For mechanism analyses, this analysis is useful to find the kinematic modes. This is not a static computation, and no external forces are taken into account. For more information, see the KINI parameter of the Samcef .ALGO command.
Inverse Analysis
Activate (.ALGO INVERSE 1)	Controls whether the software reverts from the deformed shape to the initial shape. You can use this only with certain materials and element types, as explained in Inverse analysis in the Simcenter Samcef solver documentation.When you use the Model Setup command, the solver checks for these materials and element types and displays a warning message if the appropriate ones are not present in the model.For more information, see the INVERSE parameter of the Samcef .ALGO command and Inverse analysis.

Solver Parameters page

Solver Type
Solver Type (.ALGO RESO)	Specifies the solver type.SkylineSuitable for problems smaller than 5000 degrees of freedom. SparseSuitable for problems greater than 5000 degrees of freedom. MUMPSRuns the MUMPS solver. Suitable in parallel mode.AutoLets Simcenter Samcef choose the best solver to run.For more information, see the RESO parameter of the Samcef .SUBCASE command.
Non-symmetric solver (.SUB INLY 1)	Specifies the non-symmetric solver. Clear this check box if you want to use the symmetric solver mode only. Note: By default, the non-symmetric solver is used. The non-symmetric solver is computationally more expensive because it doubles the number of arithmetic operations. It allows convergence in some intricate cases (such as follower forces or high Coulomb friction). For more information, see the INLY parameter of the Samcef .SUBCASE command.
Contact Method Penalty
Contact Friction Convergence	Lets you specify the convergence criterion of Newton's iterative method. For more information, see the PRECNEWT parameter of the Samcef .ALGO command.
Contact Friction Convergence Value	Appears when the Contact Friction Convergence check box is selected.Specifies the convergence criterion of Newton's iterative method.
Contact Friction Penalty Precision	Lets you specify the independence of the solution. For more information, see the PRECPENA parameter of the Samcef .ALGO command.
Contact Friction Penalty Precision Value	Appears when the Contact Friction Penalty Precision check box is selected.Specifies the independence of the solution.
Advanced
Equations reordering Method (.ALGO MMFOPT)	Appears when the Sparse solver is selected from the Solver (.SAM MF) list.Specifies the equations reordering method. Select Automatic to allow Simcenter Samcef to choose the best method during the solve. You can select the METIS method or the MMD method. You can also let Simcenter Samcef choose the best of both methods during the solve by selecting Automatic from the list.For more details on the METIS and MMD ordering methods, see the solution methods chapter of the Simcenter Samcef documentation.For more information, see the MMFOPT parameter of the Samcef .ALGO command.

Output page

Output Requests
Output Requests	Specifies structural requests.
Nodal Time History Output	Specifies nodal-based time history graphs requests.
Element Time History Output	Specifies element-based time history graphs requests.
Superelement Results
Generate Nodal/Elemental Results in Superelements	Computes the results in superelements.
Reactions
Internal forces induced by linear constraints (.ALGO REAC)	Specifies how to include the internal forces in reactions induced by linear constraints.IncludeIncludes the internal forces in reactions induced by linear constraints.ExcludeExcludes the internal forces in reactions induced by linear constraints.Solver DefaultLets the solver make the best choice.For more information, see the REAC parameter of the Samcef .ALGO command.

Chaining page

Transfer non symmetrical stiffness and damping matrices (Modal Chaining)	In a nonlinear analysis to modal analysis chaining solve, select this check box if you want the symmetrical (or non-symmetrical) stiffness, damping, and mass matrices to be transferred from the nonlinear analysis. When you select this check box, the Non-symmetric solver (.SUB INLY 1) is also automatically selected.For more information, see the MATSYM parameter of the Samcef .ALGO command.
Activate Chaining	Activates chaining. For more information, see Chaining solutions (Simcenter Samcef) and Chaining with a nonlinear solution (Simcenter Samcef).

User page

User Parameters
User Parameters for .ALGO	Lets you specify user parameters for the .ALGO Samcef command.
User Parameters for .SAM	Lets you specify user parameters for the .SAM Samcef command.
User Parameters for .GEL	Lets you specify user parameters for the .GEL Samcef command.

Note:

The added text must be compliant with the Samcef Command Language terminology. For more information, see the Simcenter Samcef documentation.

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Solution dialog box (Simcenter Samcef Nonlinear Analysis), Simcenter 3D 2021.1 Series

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