Selecting the Physics Models including Global Filter Radius

You model the primal, steady air flow through the Y-Junction manifold by using the coupled solver. For shape optimization, you select the Adjoint model to compute the surface sensitivities with respect to cost functions. The size of geometrical features introduced during the optimization is controlled with the global filter radius.

To select the physics models:

  1. For the physics continuum, Continua > Physics 1, select the following models in order:
    Group Box Model
    Material Gas
    Flow Coupled Flow

    Gradients (selected automatically)
    Equation of State Constant Density
    Time Steady
    Viscous Regime Turbulent

    Reynolds-Averaged Navier-Stokes (selected automatically)
    Reynolds-Averaged Turbulence K-Epsilon Turbulence

    Realizable K-Epsilon Two-Layer (selected automatically)

    Wall Distance (selected automatically)

    Two-Layer y+ Wall Treatment (selected automatically)
    Optional Models

    Adjoint

    Adjoint Frozen Turbulence (selected automatically)

    Solution Interpolation
    Adjoint Flow Adjoint Flow
    Optional Adjoint Models Surface Sensitivity
    NoteThe model Adjoint Frozen Turbulence is the only available option for the adjoint solver when K-Epsilon Turbulence is selected for the primal solution.
  2. To review the models, expand the Physics 1 > Models node.


    You set the Global Filter Radius to limit the size of geometrical features introduced during the optimization, and to ensue that the surface sensitivity field contains no sharp variations on a length scale.

  3. Select the Physics 1 > Models > Surface Sensitivity node and set Global Filter Radius to 0.004 m.
  4. Save the simulation.