Improving Robustness and Stability of the Simulation

In the course of the SPH simulation, it can occur that individual oil particles cross the closed surface of the gear housing and escape from the domain of interest. To avoid the computational effort that is associated with tracking these outliers, Simcenter STAR-CCM+ removes the escaping particles as soon as they meet a certain position-based criterion. You define this criterion in the form of a bounded shape box that encloses the housing.

To improve the robustness and stability of the simulation:
  1. Create a bounded shape box:
    1. Right-click the Geometry > Parts > Operations node and select New > Boolean > Bounded Shape.
    2. In the Create Bounded Shape Operations dialog, select housing, then click OK.
    3. Right-click the Operations > Bounded Shape node and select Execute.
    4. Select the Parts > Bounded Shape node.

      In the Graphics window, the selected part is highlighted as follows:



  2. Define the removal of particles that cross the bounding box:
    1. Select the Continua > Oil Continuum > Models > Particle Remediation node and activate Enable Position-Based Removal.
    2. Select the Particle Remediation > Position-Based Criterion node and set Part to Bounded Shape.
  3. Save the simulation.