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Solution → Stability control

Purpose · Steps · Inputs and units · Limitations · Related topics

Purpose

Adjust solver relaxation to balance stability and convergence speed.

Steps

  1. Start with Default in Stability control.

    Stability control controls

  2. If residuals grow or oscillate, inspect the mesh and boundary conditions, then consider Conservative.
  3. Use Aggressive only when the case is stable, and watch residuals, monitored quantities, and balances after the change.

Inputs and units

Input or valueMeaningUnits
PresetAggressive uses less damping; Conservative uses more damping; Default is the starting choice.Dimensionless relaxation settings

Limitations

  • Stronger damping can make residuals change very slowly and can mask a stalled solution. A flat residual history alone does not establish convergence. Relaxation cannot correct an invalid setup or poor mesh.

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