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/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

  1. This option is available for 3D analysis only.
  2. Further explanation about this formulation can be found in ALE Formulation in the Radioss Theory Manual.
  3. Effective time step Δt*0 is computed using damping parameter:(1)
    Δt*0=Δt0η+1+η2