Defining Expert Numerics Controls

You can define controls to assess and fine-tune a mesh. Some options aim to improve robustness, while other options aim to improve accuracy.

Important: These controls are intended for expert users.

Before you begin:
See Also
About Expert Numerics Controls
  1. From the Disable secondary diffusion and Disable second order advection options, select one of the following:
    OptionDescription
    All Cells Disables the second-order terms defined in the equation controls for the entire domain.
    Bad Cells Only Disables the second-order terms defined in the equation controls for only bad elements.
    Never Never disables terms; the solver always uses second-order schemes.
  2. From the Bad cells definition section, select any of the following that apply:
    OptionDescription
    Enable chevron cells detection Targets elements for which the line joining the cell centers does not pass through their common face.
    Max skewness angle Targets elements whose skewness angle exceeds a value that you specify.
    Max volume ratio Targets elements whose volume ratio exceeds a value that you specify.
  3. Select Pressure dissipation term to consider the pressure dissipation as part of the analysis.

    You might want to include pressure dissipation for simulations where the long-term pressure might change the solution, and you might want to ignore the effects of pressure dissipation to converge on a solution more quickly.

  4. From the Momentum pressure gradient formulation section, select either of the following:
    OptionDescription
    Conservative Implements the momentum pressure gradient using a surface integral flux form.
    Nonconservative Implements the momentum pressure gradient using a volumetric integral form.