Nastran Parallel Processing Capability

Nastran Parallel Processing Capability

How to check the number of Cores in your processor?

Step 1:  Press Ctrl + Shift + Esc to open Task Manager.

Step 2:  Select the Performance tab to see how many cores and logical processors your PC has.

Nastran Parallel processing capability

The Nastran solvers do use multiple processors. The only thing that you need to do is indicate how many processors you want to use. (The default is 2, which is why the log file indicates the analysis is using only 2 of your available processors.) You want to set the value for the Parameter NPROCESSORS.

How to change the number of processors to be used by Nastran?

Step 1: Go to Nastran-In-Cad environment

Step 2: In the Nastran Model Tree, go to Parameters.

Step 3: Open the Parameters tab.

Step 4: Go to Parameters > Program Control Directives.

Step 5: From here we can change the Number of Processors to be used for the analyses by changing the value of NPROCESSORS. The default value for NPROCESSORS is 2 and can be changed to the number of cores your PC has.

Please Note: This setting will only be applicable for this Analysis only and won’t continue for the future analysis. The default setting for the number of processors will be restored, i.e. 2, once the Nastran solver is restarted.

Also, bare in mind that meshing is not included in this edit as it will only work on the solver side.

You will see development for some models while others will show only minor improvement in pace.

How can the default parameters for all new Nastran In-CAD analyses (version 2019.2 and older) or Inventor Nastran analyses (version 2020.0 and newer) be changed so that one does not have to manually define settings for each new analysis?


To modify the default parameters for all future analyses, modify the file NASTRAN.INI. This file is located in the installation folder:

  • For 2015-2018, the default installation folder is “C:\Program Files\Autodesk\Nastran In-CAD YYYY\System\Nastran\Nastran.INI”, where “YYYY” is the year.
  • For 2019, the default installation folder is “C:\Program Files\Autodesk\Nastran 2019\Nastran”.
  • For 2020 and newer, the default installation folder is “C:\Program Files\Autodesk\Inventor Nastran YYYY\Nastran”.
  • Otherwise, search for NASTRAN.INI.

The file can be modified using any standard text editor such as Notepad.

Note: Windows 10 may not let the user save the NASTRAN.INI file to the default location. If this occurs, save the file to a different folder. Then move the file to the default folder and give permission to replace it.

Need further assistance with the Nastran Parallel Processing capability or want to speak with one of our Specialists, contact us by clicking HERE


How to Streamline your Autodesk Inventor Workflow

11 October 2023

Learn how to streamline your Autodesk Inventor workflow and save time with Sovelia Inventor. Discover features like Part List Editor, Visibility, Property Editor, Component Library, and more. Improve efficiency and reduce repetitive tasks. Read our blog for valuable insights

Learn more

Taking MEP Design to the Next Level

07 September 2023

Software solutions like Autodesk's Revit MEP have transformed the industry by providing robust tools for Mechanical, Electrical, and Plumbing (MEP) professionals. Nevertheless, the path from good to exceptional often involves fine-tuning, and this is where Naviate MEP enters the equation. In this blog, we'll delve into the synergy between Revit MEP and Naviate MEP, showcasing how Naviate MEP takes the capabilities of Revit MEP to new heights, empowering MEP experts to elevate their designs and workflows to an exceptional level.

Learn more

Bluebeam Revu explored in detail: One team, one goal, one source of truth

10 August 2023

Unlocking Efficiency and Precision: Dive into Bluebeam Revu's Comprehensive Features. Discover how Bluebeam Revu empowers professionals with its advanced tools for PDF creation, markup, collaboration, and project management. From customisable markups to real-time collaboration, explore how this industry-leading software streamlines workflows and enhances productivity. Read on to uncover a detailed exploration of Bluebeam Revu's capabilities and how it revolutionises the way you work

Learn more