/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
Δ t 0 γ η ν MathType@MTEF@5@5@+= feaagKart1ev2aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr 4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq=Jc9 vqaqpepm0xbba9pwe9Q8fs0=yqaqpepae9pg0FirpepeKkFr0xfr=x fr=xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbaGaeqyVd4gaaa@37AF@    
Vmin                

Definitions

Field Contents SI Unit Example
Δ t 0 Typical time step

(Real)

[ s ]
γ Nonlinearity factor

Default = 0.0 (Real)

 
η Damping coefficient

Default = 0.5 (Real)

 
ν MathType@MTEF@5@5@+= feaagKart1ev2aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr 4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq=Jc9 vqaqpepm0xbba9pwe9Q8fs0=yqaqpepae9pg0FirpepeKkFr0xfr=x fr=xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbaGaeqyVd4gaaa@37AF@ Shear factor

Default = 1.0 (Real)

 
Vmin Element with a volume less than Vmin will be declared

Default = -1030 (Real)

[ m 3 ]

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 Δ t 0 * MathType@MTEF@5@5@+= feaagKart1ev2aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr 4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqGqFfpeea0xe9vq=Jb9 vqpeea0xd9q8qiYRWxGi6xij=hbba9q8aq0=yq=He9q8qiLsFr0=vr 0=vr0db8meaabaqaciGacaGaaeqabaWaaeaaeaaakeaacqqHuoarca WG0bWaa0baaSqaaiaaicdaaeaacaGGQaaaaaaa@3B5C@ is computed using damping parameter:(1)
    Δ t 0 * = Δ t 0 η+ 1+ η 2 MathType@MTEF@5@5@+= feaagKart1ev2aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr 4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqGqFfpeea0xe9vq=Jb9 vqpeea0xd9q8qiYRWxGi6xij=hbba9q8aq0=yq=He9q8qiLsFr0=vr 0=vr0db8meaabaqaciGacaGaaeqabaWaaeaaeaaakeaacaqGuoGaam iDamaaDaaaleaacaaIWaaabaGaaiOkaaaakiabg2da9maalaaabaGa aeiLdiaadshadaWgaaWcbaGaaGimaaqabaaakeaacqGHsislcqaH3o aAcqGHRaWkdaGcaaqaaiaaigdacqGHRaWkcqaH3oaAdaahaaWcbeqa aiaaikdaaaaabeaaaaaaaa@46F0@