Solver Parameters dialog box (Multiphysics)

General tab

Scratch Directory

Scratch Directory

Specifies the location for data that is stored in temporary database files.Select Current Simulation to use the directory where the current Simulation file is stored.Select Specify to specify a location for the scratch directory.Select Simulation-Solution Name to generate a subdirectory in the working directory with the name of the current simulation followed by a hyphen and the name of the active solution.Select Solution Name to generate a subdirectory in the working directory with the name of the active solution.

Structural Solver tab

Option	Description
License Type	Specifies the type of solver license you are using for the Simcenter Nastran structural solve.
Formatting
Input File Formatting	Specifies how the software writes out the Nastran input file.PerformanceMinimizes the time required to write out the Nastran input file.The export process is faster.Performance is improved by writing out Nastran real data using small field entries; for values that have more than 8 characters, the software writes out the value in the Nastran exponential format. GRID, MPC, CORD2C/CORD2R/CORD2S, and RBE3 cards are always exported in large field entries (16 characters) rather than in small fields, to ensure accuracy. Nodes and elements are not sorted. For example, GRID with ID 1 may be written after GRID with ID 100 in the Nastran input file. PrecisionEnables large field format (16 characters), fixed field length, maximum real data precision, and Nastran exponential format. Nodes and elements are sorted in the Nastran input file.
Real Data Filter	If any real values to be written to the input file are less then the Real Data Filter value, these values will be written to the OP2 file as 0.0.
Real Filter Value	Specifies the value of the Real Data Filter.
File Path Format	Controls how the software writes out the path to files in the Nastran input file.Select Absolute to have the software fully write out the file path using path separators that are native to your operating systemSelect Relative, Using Native Separators to have the software write out file paths relative to the location of the solver file using path separators that are native to your operating system.Select Relative, Using Windows Separators to have the software write out file paths relative to the location of the solver file using backward slash ("") path separators.Select Relative, Using Linux Separators to have the software write out file paths relative to the location of the solver file using forward slash ("/") path separators.
Solver Executable	Specifies the location of the executable for your solver. You can:Select the Use environment variable UGII_NX_NASTRAN check box to have the software use the location of the executable as specified by the environment variable.By default, this variable is defined in the ugii_env.dat included with the installation. It points to the Simcenter Nastran executable in the nx_nastran directory within this software's installation directory. You can customize the UGII_NX_NASTRAN variable to point to a different installation.Note: You should ensure that the UGII_NX_NASTRAN variable points to the appropriate executable. Do not use the nastran*w executables, such as nastranw.exe or nastranw64w.exe to launch Nastran. These files are intermediate files that stop running before a solve completes.You can also use the NASTRAN Solver Location options in the customer defaults to specify the default location of the Nastran executable.Use the User Specified box to manually specify the solver's directory path and executable file name.
Solver Version	Specifies the version of Simcenter Nastran to use. You can:Select the Use environment variable UGII_NX_NASTRAN_VERSION check box to have the software use the version of the solver specified by the UGII_NX_NASTRAN_VERSION environment variable. This variable is defined in the ugii_env.dat included with the installation. This variable should be consistent with the version pointed to by the UGII_NX_NASTRAN variable. You can also use the NASTRAN Solver Version options in the customer defaults to specify the default version of the Nastran executable.Use the User Specified box to manually specify the solver's version number.The software infers and stores the path to the file that you specify relative to the Simulation file. If the location of the file changes, the software uses the stored relative path information to try to locate the file. For more information, see Relative path support for external files,
nastran Command Keywords
Solution Monitor	When selected, displays the Solution Monitor after the bulk data deck has been submitted to the solver. See Solver Parameters dialog box (Multiphysics) for more information.
Solution Summary Tab for Legacy Monitor	When you are using a version earlier than NX Nastran 10, a legacy version of the Solver Monitor is used, and this option enables the Solution Summary tab on the Solver Monitor. The Summary tab lists a summary of the solution.
Open Core Memory to Allocate	Specifies the RAM allocated during the solve. Note that Simcenter Nastran allocates all specified memory to the solver during a solve, which could affect other processes you want to run simultaneously.
Save Previous Copies of the Output Files	Select this option to specify that existing output files be renamed with an extension rather than be overwritten.
Delete Database Files	Lets you control whether database files generated during the solve are saved or deleted.
Maximum Number of CPUs	Specifies whether to use shared-memory parallel (SMP) processing for the analysis. SMP processing reduces elapsed time at the expense of increased CPU time.For more information, see the Simcenter Nastran Parallel Processing User’s Guide.
Enable Shared -Memory Parallel	Specifies the maximum number of CPUs for shared-memory parallel (SMP) processing.
Shared Library for User Defined Materials	Lets you specify the location of the UMAT material subroutine. For more information, see Simcenter Nastran user-defined material models.The software infers and stores the path to the file that you specify relative to the Simulation file. If the location of the file changes, the software uses the stored relative path information to try to locate the file. For more information, see Relative path support for external files.
Additional Keywords	Lets you specify any additional keywords for the nastran command or any system cells for the NASTRAN executive control statement. See nastran Command and NASTRAN Statement in the Simcenter Nastran Quick Reference Guide for more information.

Thermal/Flow Solver tab

Solver Version
Version Number	Displays the version including the patch number of the Simcenter 3D Thermal and Flow solvers to use.
Parallel Processing
Run Solution in Parallel	Specifies that the solver use parallel processing to run the analysis.You specify the parallel configuration XML file in the Parallel Configuration File box. The parallel configuration file contains a computer list. This is the list of computers that you want to use to run the thermal and flow solvers in parallel.You can browse to an existing file or create a new file. To create or modify a parallel configuration XML file, click Create New File or Modify Existing File, respectively. This launches the Parallel Configuration Tool that allows you to set up the environment for parallel processing.The software infers and stores the path to the file that you specify relative to the Simulation file. If the location of the file changes, the software uses the stored relative path information to try to locate the file. For more information, see Relative path support for external files.The efficiency and scaling of parallel processing using a large number of cores, depends on computer hardware, number of elements and physics in a model. For a better scaling, consider the following guidelines:Request the maximum number of physical cores available in your computer.Avoid using the maximum number of logical cores when you use hyper-threading because threads can compete for the same hardware resources and create a significant slowdown in the solution.For more information, see Parallel processing.
Enable Multithreading	Enables multithreading where the thermal solver uses shared-memory parallelization in the Analyzer module. The Analyzer module is the module in the thermal solver that calculates steady state or transient temperatures and total pressures for models with thermal and duct elements.You specify the number of execution threads to use in the Number of Execution Threads box.To optimize the use of your computer, set the number of execution threads to the number of cores or processors on your computer. For example, set the number of execution threads to two for dual-core machines or to four for quad-core machines. Multithreading is most-useful for radiation-dominated models.
Material Export
Export Mechanical Properties	Exports the Young's modulus and Poisson's ratio properties for isotropic, orthotropic, and compound isotropic materials to the input XML file.
Invalid Material Properties Check	Lets you select the type of notice that is generated and the action the software performs if the Model Setup Check and solver detect invalid material properties.ErrorWrites an error message if the Model Setup Check and the solver detect invalid material properties and stops the solve process.WarningWrites a warning message if the Model Setup Check and the solver detect invalid material properties, but the solve process continues. For isotropic, orthotropic, and anisotropic materials, the thermal conductivity (for steady-state and transient analyses) and specific heat (for transient analyses) properties are validated. For fluid materials, for both steady-state and transient analyses, the mass density and dynamic viscosity properties are checked.

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Solver Parameters dialog box (Multiphysics), Simcenter 3D 2021.1 Series

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