Solutions

When you create a solution, you select the solver (such as Simcenter Nastran), analysis type (such as Structural), and solution type (such as Linear Statics). A solution, which is stored in the Simulation file, contains a set of loads, constraints, and simulation objects. You can solve using these conditions, or create new solutions defined by different conditions.

You can use an unlimited number of solutions per Simulation.

For each solution, the selected solver determines which options are displayed, as well as the language used on the dialogs. Examples of solver-specific data include:

• Loads

• Constraints

• Simulation objects

• Solution options

• Solution parameters

You can import a solution from a source simulation to reuse in another simulation. For more information about importing solutions, see Importing simulation entities.

Solution Steps or Subcases

Each solution contains additional storage elements called steps or subcases, depending on the solver. Each step or subcase holds solution entities such as loads, constraints, and simulation objects.

• Simcenter Nastran, MSC Nastran — For structural solves, constraints can be stored in the main solution or in the subcases; loads are stored in subcases. For thermal solves, loads and constraints are both stored in subcases.

• ANSYS — Constraints are stored in the main solution and loads are stored in substeps, except for Nonlinear Statics and Thermal solves, where constraints are stored in substeps.

• Abaqus — Loading histories are divided into steps. For linear analyses, each step is essentially a load case. All loads and constraints are grouped in named steps. Steps may contain any number of loads and constraints of any type.To simulate problems in which the results of one step are the initial conditions for the next step, you must ensure that the loads and boundary conditions of the previous step are also included in subsequent steps.

• LS-DYNA — For the LS-DYNA solver, the Create Solution dialog box lets you create a structural solution. This ability is for future expansion. It is not necessary to create a Simulation file or solution. Instead, you perform the Export Simulation command directly from the FEM to write the LS-DYNA keyword file. Pre/Post does not support boundary conditions or loads for LS-DYNA. For a list of supported LS-DYNA keywords, see LS-DYNA elements.

• Simcenter Samcef — Constraints are stored in the main solution. Loads are stored in the main solution, except for Linear Statics, where loads are stored in subcases (loadcases). Some simulation objects are store in subcases: for more information see Enabling or disabling elements in subcases (Simcenter Samcef).

You can create an unlimited number of steps or subcases per solution.

Prerequisite solutions

You can assign prerequisite solutions to another solution so that the software automatically solves a set of solutions in a specified sequence with a single Solve command. The solution to which you assign prerequisites becomes the master solution, identified by the chain symbol on solution icons (for example, ) in the Simulation Navigator.

The master solution is relative. For example, in the set of prerequisite solutions below, Solution 1 is the master to Solution 2, and Solution 2 is the master to Solution 3. If you solve Solution 2, the software solves its prerequisite, Solution 3, first.

You can also create sets of solutions. For example, in the sets of solutions below, Solution 3 might generate temperature results that are used by Solution 2 and Solution 4, which could be linear static solutions but with different boundary conditions for different use cases. Solution 1 could be a modal analysis that relies on the linear static results from Solution 2.

Use the Manage Prerequisite Solutions command to assign prerequisite solutions to a master solution. You can assign prerequisite solutions in every solver environment.

Note:

Do not select imported solutions as prerequisite solutions. The software skips imported solutions if you select them as prerequisites.

Example:

In the Simcenter Nastran solver environment, you can make a linear static solution dependent on the results of a thermal solution and solve both solutions with one command.

1. Create a thermal solution with SOL 153 Steady State Nonlinear Heat Transfer and thermal constraints.

2. Create a static solution with SOL 101 Linear Statics - Global Constraints and a temperature set that points to the .op2 file from the thermal solution.

3. Use the Manage Prerequisite Solutions command to make the thermal solution a prerequisite to the static solution.

4. Solve the static solution.The software solves the thermal solution and generates the .op2 file. Because you defined the thermal solution as a prerequisite to the linear static solution, the software then solves the static solution, which uses the .op2 file generated by the thermal solution.

Predefined prerequisite solutions in the Simcenter Samcef environment

The Simcenter Samcef environment supports a more advanced variant of prerequisite solutions called solution chaining. In the Simcenter Samcef environment, chaining links solutions for different analysis types. For example, if you want to use linear static results to preload a modal analysis, you can chain both solutions so that the software solves the linear static solution first, and then solves the modal solution using the linear static results.

You can create Simcenter Samcef chained solutions in the Solution dialog box→Chaining page. The solutions for the corresponding master solution appear in the Manage Prerequisite Solutions dialog box→Predefined Prerequisite Solutions group.

For information on solution chaining in the Simcenter Samcef environment, see Chaining solutions (Simcenter Samcef).

Solving solutions

• Use the Solve command to solve the active solution. If the active solution is a master solution, the software solves the prerequisite solutions first.

• Use the Solve All Solutions command to solve all solutions in the Simulation file. You can solve the solutions simultaneously or sequentially, and skip solved solutions, meta solutions, and model checking. If the Simulation file contains master solutions, the software:Solves non-prerequisite solutions before the master solutions.Solves master solution prerequisites in the foreground, even if the solution is not configured to run in the foreground.For more information, see Batch solving and Solve All Solutions dialog box.

Learn more

Solver-specific modeling objects

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Solutions, Simcenter 3D 2021.1 Series

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