/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
- 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.
- The Δt0 must be greater than the actual time step used in simulation.
- 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.
- Default values are taken from a previous run.