/ALE/GRID/SPRING
Block Format Keyword Grid nodes are connected with nonlinear springs (those springs have no effect on the material, only on the movement of the grid).
Format
(1) | (2) | (3) | (4) | (5) | (6) | (7) | (8) | (9) | (10) |
---|---|---|---|---|---|---|---|---|---|
/ALE/GRID/SPRING | |||||||||
Δt0 | γ | η | ν | ||||||
Vmin |
Definitions
Field | Contents | SI Unit Example |
---|---|---|
Δt0 | Typical time
step (Real) |
[s] |
γ | Nonlinearity
factor Default = 0.0 (Real) |
|
η | Damping
coefficient Default = 0.5 (Real) |
|
ν | Shear factor Default = 1.0 (Real) |
|
Vmin | Element with a volume less
than Vmin will be
declared Default = -1030 (Real) |
[m3] |
Comments
- This option is available for 3D analysis only.
- Further explanation about this formulation can be found in ALE Formulation in the Radioss Theory Manual.
- Effective time step
Δt*0
is computed using damping parameter:
(1) Δt*0=Δt0−η+√1+η2