Exporting 2D Field Data to Simcenter Reduced Order Modeling

From Design Manager you can export scalar scenes to create image-based Reduced Oder Models (ROM) in Simcenter Reduced Order Modeling.

Simcenter Reduced Order Modeling is a software package that creates simplified mathematical models (that is, reduced order models) based on the fields computed in complex simulations. These simplified models replicate the behavior of the complex models with significantly reduced computing resources.

Simcenter Reduced Order Modeling provides the following model types:



The automatic export from Design Manager only allows you to export scalar scenes to a 2D static fields model in Simcenter Reduced Order Modeling.

However, if you export solution data manually through .csv tables from Simcenter STAR-CCM+, you can also create Static Samples and Timer Series models.

  1. To export a scalar scene to Simcenter Reduced Order Modeling:
    1. Create a scalar scene.
    2. Make sure the scene contains only one Scalar Displayer.
    3. Select the [scalar scene] > [scalar displayer] > Scalar Field node and set Auto Range to Off.
    4. Set the Min and Max value.
    5. Zoom the flow field to include the important flow pattern you want to capture in a reduced order model.
  2. In Design Manager:
    1. Open the relevant design study.
      To build a ROM for the entire design space, you are advised to set up a DOE study. To explore a certain area of the design space, you can also build a ROM from other types of design study.
    2. Select the [design study] > Scenes > [scalar scene] node and set the Export Formats to Hardcopy for Simcenter Reduced Order Modeling (*.png).


      For all the scenes with the Export Formats Hardcopy for Simcenter Reduced Order Modeling (*.png), Design Manager generates Reduced Order Modeling hardcopies for all the successful designs.

      For each scene, Design Manager creates two types of hardcopy images:

      • regular hardcopies for snapshots viewing
      • gray scale hardcopies for Simcenter Reduced Order Modeling to extract shape and field data
  3. You can also generate Reduced Order Modeling hardcopies from an existing study that you have already run:
    1. In the reference simulation, adjust the scalar scenes settings as described in step 1, then save the simulation.
    2. In the Design Manager project, update the reference simulation.
    3. For each scene, set Export Formats to Hardcopy for Simcenter Reduced Order Modeling (*.png).
    4. To update the study results, right-click the [design study] and select Update Results.
Optionally, you can configure the installation path of Simcenter Reduced Order Modeling in Simcenter STAR-CCM+, so that Simcenter STAR-CCM+ can launch Simcenter Reduced Order Modeling automatically with the exported data.
  1. To configure the Simcenter Reduced Order Modeling installation path, select the Tools > Options > Environment node from the toolbar, set the Simcenter Reduced Order Modeling Launch Command to the Simcenter Reduced Order Modeling executable. By default, the executables are located at:
    Linux [ROM_INSTALLDIR]/LX64/rombuilder.sh
    Windows [ROM_INSTALLDIR]\Win64\ROMBuilder.exe


  2. To export 2D field data, right-click [design study] and select Open in Simcenter Reduced Order Modeling.
    Design Manager exports the following two files:
    • The artifact JSON and scene gray-scale image files into the compressed folder [study]_rom_data.zip.
    • The rominput JSON argument file to launch Simcenter Reduced Order Modeling [study]_rom.rominput.

    If you specified the Simcenter Reduced Order Modeling launch command, as instructed in the previous step, Simcenter STAR-CCM+ automatically opens the exported 2D field data in Simcenter Reduced Order Modeling. If not, the *.zip and *.rominput files are saved in the directory of the Design Manager project.

    If the Design Manager server is running on a remote server—that is, if you run the Simcenter STAR-CCM+ client locally and connect to a remote Design Manager server, Open in Simcenter Reduced Order Modeling only exports the files.

    You can launch Simcenter Reduced Order Modeling at a later time and load the exported files manually as follows:

    Linux 
    [ROM_INSTALLDIR]/LX64/rombuilder.sh [path_to_rominput]/study_rom.rominput overwrite
    The option 
    overwrite
    overwrites the old ROM project, ensuring the usage of the latest exported file
    Windows Launch Simcenter Reduced Order Modeling.

    Select New > 2D Fields.

    In Add data, select the exported .zip file.
  3. To launch Simcenter Reduced Order Modeling without exporting 2D data, select the Tools node from the toolbar and click Launch Simcenter Reduced Order Modeling.


    The launch function works only when Simcenter Reduced Order Modeling Launch Command is configured correctly.