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/ALE/GRID/SPRING

Engine Keyword With this keyword it is possible to modify grid formulation parameters which initially be set in Starter keyword /ALE/GRID/SPRING. (Altair bar method for grid velocity computation).

Format

/ALE/GRID/SPRING

Δt0 γ η υ Vmin

Definitions

Field Content SI Unit Example
Δt0 Typical time step.

(Real)

[s]
γ Nonlinearity factor.

Range: [0;1]

(Real)

 
η Damping coefficient.

(Real)

 
υ Shear scale factor.

(Real)

 
Vmin Minimum volume for element deletion.

(Real)

[m3]

Comments

  1. For more details, refer to ALE Grid Calculation in the User Guide and /ALE/GRID/SPRING in the Starter Reference Guide.

    As of v12.0.210, /ALE/2 was replaced by /ALE/GRID/SPRING.

  2. The Δt0 must be greater than the actual time step used in simulation.
  3. The γ is used to prevent the time step from dropping due to element collapse.

    γ = 1 means no nonlinear effects

    0 < γ < 1 means less weight is given to elements that do not collapse.

  4. Default values are taken from a previous run.