Export of Nastran parameters

Because you can include parameters in your Nastran input file in multiple ways, the software uses the following order of precedence when you export or solve a Nastran input file that contains duplicate parameter entries:

1. Hardcoded parameters

2. Parameters that correspond to options in the Solution dialog box

3. Parameters defined with the Additional Parameters option in the Customer Defaults dialog box

4. Parameters defined using the options in the Solution Parameters modeling object dialog box

5. Parameters specified using the User Defined section in the Solution Parameters modeling object dialog box

Parameters that are hardcoded on export

Solution Type	Parameter	Value	Comments	Simcenter Nastran Support	NX Design Simulation Support	MSC Nastran Support
All Nastran solutions	OMACHPR	YES	This parameter is always exported.	Yes	Yes	Yes
POST	-2		Yes	Yes	Yes
POSTEXT	YES		Yes	Yes	Yes
UNITSYS	The value depends on the selected unit system.	Depends on the template units or the unit system specified in the Export Simulation dialog box.	Yes	Yes	Yes
GxxxxxxxWhere xxxxxx is the group ID.	Complex value used to pair the Nastran node and element sets that result when a group is split on export.	Exported when a group has to be divided into two Nastran SETs or when the Export all groups to node and element sets option in the Export Simulation dialog box is selected.	Yes	Yes	Yes
SOL 153 Steady State Nonlinear Heat Transfer	TABS	The value depends on the selected unit system.	Exported when radiation loads are selected.	Yes	Yes	Yes
SIGMA	The value depends on the selected unit system.	Exported when radiation loads are selected.	Yes	Yes	Yes
SOL 101 Linear Statics—Global Constraints	ELITASPC		Exported when the Iterative Solver option is selected and the model contains CTRIA6 and/or CTRIA8 elements.	No	Yes	No
SOL 103–Response Dynamics	RSCON		Exported when Enforced Motion Location constraints are selected.	Yes	No	No
RSATT	Yes	Exported when the model includes Nodal Force Location constraints or when the dynamics subcase includes Distributed Loads.	Yes	No	No
RSOPT	1		Yes	No	No
OUGCORD	GLOBAL		Yes	No	No
SOL 111 Modal Frequency Response	OUGCORD	GLOBAL		Yes	No	Yes
DDRMM	-1		Yes	No	Yes
SOL 112 Modal Transient Response	OUGCORD	GLOBAL		Yes	No	Yes
SOL 200 Model Update	OPTEXIT	4 or 8	Exported as a value of 4 for NX Nastran 6.1 and 7.0 solutions.Exported as a value of 8 for NX Nastran 7.1 and later versions, Simcenter Nastran, and MSC Nastran versions 2007.0 and 2008.0.	Yes	No	Yes

Parameters that correspond to solution options

Some of the options in the Solution dialog box correspond to Nastran parameters. If you select one of those options, the software writes out the corresponding parameter in your input file when you export or solve your model. Except where noted, the options are located on the Parameters page in the Solution dialog box.

Parameter	Option in Solution dialog box	Supported Solution Types	Comments	Simcenter Nastran Support	Simcenter Nastran Design Simulation Version Support	MSC Nastran Support
ALPHA1	Mass Scale Factor (Real) and Mass Scale Factor (Imaginary) options	SOL 402 Multi-Step Nonlinear KinematicsSOL 601,106 Advanced Nonlinear StaticsSOL 601,129 Advanced Nonlinear TransientSOL 701 Explicit Advanced Nonlinear Analysis		Yes	No	No
ALPHA2	Stiffness Scale Factor (Real) and Stiffness Scale Factor (Imaginary) options	SOL 402 Multi-Step Nonlinear KinematicsSOL 601,106 Advanced Nonlinear StaticsSOL 601,129 Advanced Nonlinear TransientSOL 701 Explicit Advanced Nonlinear Analysis		Yes	No	No
AUTOMPC	Automatic Selection of Dependent DOFs check box	Supported for all solutions in the Design Simulation application		No	Yes	No
CORROPT	Store Model Matrices for Correlation check box located on the General tab of the Solution Options dialog box	SOL 103 Real Eigenvalues	Exported as CORROPT=YES when the Store Model Matrices for Correlation check box is selected.	Yes	No	No
G	Structural Damping option	SOL 108 Direct Frequency Response		Yes	No	Yes
G	Damping option	SOL 109 Direct Transient Response		Yes	No	Yes
INREL	Inertia Relief check box	SOL 101 Linear Statics—Global ConstraintsSOL 101 Linear Statics—Subcase ConstraintsSOL 103 Response Dynamics	For SOL 103 Response Dynamics solutions, exported as INREL=-1 when the solution also contains a Fictitious Support simulation object.For all other supported solution types, exported as INREL=-2.	Yes	Yes	Yes
K6ROT	Flat Shell Rz Stiffness Factor check box	Supported for all solution sequences except SOL 601,106 Advanced Nonlinear Statics, SOL 601,129 Advanced Nonlinear Transient, and SOL 701 Explicit Advanced Nonlinear Analysis.	The default value for this parameter comes from the Customer Default settings.	Yes	No	Yes
LAMLIN	Rigid Body Modes Below option	SOL 103–Response Dynamics		Yes	No	No
LGDISP	Large Displacements check boxFor SOL 401 Multi-Step Nonlinear, this check box appears on the Bulk Data page.	SOL 106 Nonlinear StaticsSOL 129 Nonlinear Transient ResponseSOL 401 Multi-Step NonlinearSOL 402 Multi-Step Nonlinear KinematicsSOL 601,106 Advanced Nonlinear StaticsSOL 601,129 Advanced Nonlinear TransientSOL 701 Explicit Advanced Nonlinear Analysis	Exported as LGDISP=1 when the Large Displacements check box is selected.	Yes	No	Yes
LGSTRN	Large Strains check box	SOL 402 Multi-Step Nonlinear KinematicsSOL 601,106 Advanced Nonlinear StaticsSOL 601,129 Advanced Nonlinear TransientSOL 701 Explicit Advanced Nonlinear Analysis	Exported as LGSTRN=1 when the Large Strains check box is selected.	Yes	No	No
MATNL	Material Nonlinearity (MATNL) check boxFor SOL 401 Multi-Step Nonlinear, this check box appears on the Bulk Data page.	SOL 401 Multi-Step NonlinearSOL 402 Multi-Step Nonlinear Kinematics	Exported as MATNL=1 when the Material Nonlinearity (MATNL) check box is selected.	Yes	No	No
NLAYERS	Number of Layers (NLAYERS) box	SOL 402 Multi-Step Nonlinear Kinematics		Yes	No	No
RESVEC	Residual Vectors check box	SOL 103–Response Dynamics	Exported as RESVEC=YES	Yes	No	No
SNORM	Grid Point Normals Generation Tolerance (SNORM) box	SOL 402 Multi-Step Nonlinear Kinematics		Yes	No	No
W3	Dominant Frequency in the Overall Structural Damping options	SOL 109 Direct Transient Response		Yes	No	Yes
W4	Dominant Frequency in the Element Structural Damping options	SOL 109 Direct Transient Response		Yes	No	Yes

How do I

Define Nastran solution parameters

Understanding the export of PARAM,WTMASS

Learn more

Specifying parameters for Nastran analyses

Quick links

Command reference

Pre/Post video examples

Bulk Entry Descriptions

Simcenter 3D tutorials

Browse Simcenter 3D help by product area

Export of Nastran parameters, Simcenter 3D 2021.1 Series

© 2020 Siemens

window.mainLanguage="en_US"

window.delivId=""

window.projectId=""

MathJax.Hub.Config({ TeX: { extensions: ["autoload-all.js"] }, tex2jax: { displayMath: [ ] }, "SVG": { scale: 125 } });