Solution Step dialog box (Simcenter Samcef Thermal)

Solution
Name	Sets a name for the step.
Solver TypeAnalysis TypeSolution	Displays the solver, analysis, and solution type of the parent solution.
Step	Specifies the type of step to create.
Steps to Create	Sets the number of steps to create.
Relative Position	Sets the position of this step as it will appear in the Simulation Navigator (relative to the other steps in this solution) and the sequence in which it will be processed during the solve.
Make Active	By default, any new step is inactive. Select the Make Active check box to make it active.
Properties
Description	Sets a description for the solution step. Click to open an editor that lets you type or paste a longer description.
Subcase Analysis Type
Analysis	Specifies the type of subcase time response to perform. Transient AnalysisCompute the transient response.Steady-State AnalysisCompute the stationary (non uniform) temperature distributions.Note: A steady-state analysis is valid only for the first subcase.For more information, see the MECA parameter of the Samcef .SUBCASE command.

Time page

Time Interval
From****To	Specifies the starting and ending computation time for the step.For more information, see the T1, T2 or TIMP, A sets of parameters of the Samcef .SUBCASE command.

If you want to set up an Automatic Time Step scheme:
Automatic Time Step
Automatic Time Step	Lets Samcef handle time steps automatically. For more information, see the CIBL parameter of the Samcef .SUBCASE command.
Then, optionally, you can define the following properties:
Automatic Time Step
Minimal Time Step****Maximal Time Step	Lets you specify the allowable range for the time step when running the automatic time step computation.Depending on the computation workflow, the nonlinear solver can automatically modify at any iteration the value of the time step, but always in the given range.For more information, see the HMIN and HMAX parameters of the Samcef .SUBCASE command.
Initial Time Step (.SUB DTI0)	By default, the initial time step is either automatically computed from the selected computation times interval, or is equal to the given Maximal Time Step value below. However, the Initial Time Step (.SUB DTI0) lets you manually specify the size of the initial time step.Note: Changing the initial time step can be helpful in a model that fails to converge at the very beginning of the computation.We recommend you set up this Initial Time Step in most situations.For more information, see the DTI0 parameter of the Samcef .SUBCASE command.
Imposed Time Step
Imposed Time Step	Select this check box to manually add a time step mode to the automatic scheme. By adding a time step, you can force the solver to compute results for some specific times.For more information, see the PAS parameter of the Samcef .SUBCASE command.
Imposed Time Step Value	Appears when you select Imposed Time Step check boxLets you specify the time step value. The nonlinear solver will use this time step value except when solving iterations require a lower value to ensure convergence.

If you want to set up a manually Imposed Time Step scheme:
Automatic Time Step
Automatic Time Step	Clear this check box.
Then, optionally, define the following properties.
Imposed Time Step
Imposed Time Step or Number of Timesteps	Select the Imposed Time Step check box to manually impose your own time step value, or select the Number of Timesteps check box to impose the number of time steps instead.
Imposed Time Step Value	Appears when you select the Imposed Time Step check box.Lets you specify the time step value. The nonlinear solver will use this time step value except when solving iterations require a lower value to ensure convergence.For more information, see the PAS parameter of the Samcef .SUBCASE command.
Number of Timesteps Value	Appears when you check the Number of Timesteps check box.Lets you specify the number of time steps manually.For more information, see the NPAS parameter of the Samcef .SUBCASE command.

Integration Scheme page

Integration Scheme
Automatic Time Step (Delta T) (.SUB ERCD)	Enables the time step criterion based on the absolute error of the temperature change. For more information, see the ERCD parameter of the Samcef .SUBCASE command.
Maximum Temperature Variation (.SUB PRED)	Appears when you select the Automatic Time Step (Delta T) (.SUB ERCD) check box.Specifies the value of absolute allowable temperature change per time step.For more information, see the PRED parameter of the Samcef .SUBCASE command.

Storage page

Storage
Parameters	Specifies how you want to set the extra times at which results must be saved.To select from the list of Thermal Storage modeling objects that you defined in other subcases, or to create a new Thermal Storage modeling object, select Link.To manually define extra times that are valid only for the current subcase, select Edit.For information on the Storage Time Step and Storage Frequency options, see Storage dialog box (Simcenter Samcef).
Thermal Storage	Appears when Parameters is set to Link.Lets you select the modeling object that contains the set of storage times.To select an existing set, click More Options . The following options are available.FindLets you search for an object by entering the full name of the object.For example, to find a region named ABC_region, type ABC_region in the search box and press Enter or click Find . If the object is found, it will be selected automatically.Filter by NameLets you filter the list by the names of the objects. This filter supports wildcards. The default wildcard is the asterisk (), and it displays all entries in the list.For example, to filter the list to display every object with a name starting with the letter "a," enter a as the filter string.Filter by LabelLets you filter the list by the label of the objects.To create a new set, click Create Modeling Object .

Solver Parameters page

Parameters
Linear Prediction (.SUB DIPR)	Lets you enable the linear prediction of the displacements at the first iteration of each time step.For more information, see the DIPR parameter of the Samcef .SUBCASE command.
Diagonal Capacity Matrix (.SUB IDIA)	Appears when you select Transient Analysis in the Analysis list.Lets you use the diagonalized capacity matrix for linear elements.For more information, see the IDIA parameter of the Samcef .SUBCASE command.
Thresholds
With the following options, you can specify thresholds for the Newton method.
**Energy Threshold (.SUB PRCE)**Allowed Relative Energy Residual (.SUB PRDE)	Specifies the energy and relative energy residual thresholds. For more information, see the PRCE and PRDE parameters of the Samcef .SUBCASE command.
**Power Threshold (.SUB PRCR)**Allowed Relative Power Residual (.SUB PRDR)	Specifies the power and relative power residual thresholds.For more information, see the PRCR and PRDR parameters of the Samcef .SUBCASE command.
**Temperature Threshold (.SUB PRCQ)**Allowed Relative Temperature Residual (.SUB PRDQ)	Specifies the temperature and relative temperature residual thresholds.For more information, see the PRCQand PRDQ parameters of the Samcef .SUBCASE command.
Iterations
Maximum Iteration Number	Sets the maximum number of iterations to compute for an individual time step. For more information, see the ITMA parameter of the Samcef .SUBCASE command.
Newton's Method
Relaxation Factor (.SUB RELX	Specifies the relaxation factor. This factor can be used to help the convergence of the Newton-Raphson algorithm but can lead to more iterations.For more information, see the RELX parameter of the Samcef .SUBCASE command.
Pivots
Option on Zero Pivot (.SUB RJPZ/RJPV)	Lets you define the behavior of the solver when zero pivots are detected.NoThe solve continues when zero pivots are detected.Iterations Are StoppedThe iteration is stopped and the time step rejected.For more information, see the RJPZ and RJPV parameters of the Samcef .SUBCASE command.

User page

User Parameters
User Parameters	Lets you manually specify parameters for the .SUBCASE command that were not available in the other pages. Specify each extra parameter and its related value separated by blanks. For example, to add the specific thresholds for the iteration matrix (PRCK and PRCC), enter: PRECK 1E-10 PRCC 1E-09.

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Solution Step dialog box (Simcenter Samcef Thermal), Simcenter 3D 2021.1 Series

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