Importing the Background and the Overset Meshes

For this tutorial, you are provided with an input file that contains three meshes—one background mesh and two overset meshes. Inflow and outflow occurs through the background mesh. Each of the rotating lobes has an overset mesh. The meshes are available as regions with the individual boundary surfaces and boundary types defined.

Due to the large number of cells, you are advised to launch this tutorial in parallel on, for example, four cores.

To import the meshes:

  1. Launch Simcenter STAR-CCM+.
  2. Start a new simulation:
    1. Select File > New.
    2. In the Process Options box, select an appropriate parallel option and set the number of Compute Process to, for example, 4.
    3. Click OK.
  3. Select File > Import > Import Volume Mesh.
  4. In the Open dialog, navigate to the motion folder of the downloaded tutorial files.
    See Downloading the Tutorial Files from the Support Center Portal.
  5. Select lobeBlower.ccm then click Open.
    Simcenter STAR-CCM+ provides feedback on the import process in the Output window and three regions are created under the Regions node. Geometry Scene 1 displays the imported volume meshes.
  6. Review the imported volume meshes.
    1. Above the simulation tree, click Scene/Plot.
    2. Select the Surface 1 node and set Color Mode to Distinguish Regions.
    3. Click (Show All Meshes).


    4. Zoom in on the small gap between the lobes.


      The visualization of the two overset meshes is blurred, because they overlap with each other and with the background mesh. Note how the overset meshes are body-fitted bands around the surfaces of the lobes. The number of prism layers on each of the lobe surfaces is 5, thus fulfilling the minimum requirement for prism layer shrinkage to be applied.
  7. Save the simulation as lobePump.sim.