/ADMESH/STATE/SH3N

Block Format Keyword Describes the state of 3-node shells in a multi-stage analysis using adaptive meshing.

Format

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
/ADMESH/STATE/SH3N
sh3n_ID sh3n_ID1 sh3n_ID2 sh3n_ID3 sh3n_ID4 Actlev IMapping      

Definition

Field Contents SI Unit Example
sh3n_ID 3-Node shell identifier

(Integer)

  
sh3n_ID1 First son identifier 4

(Integer)

  
sh3n_ID2 Second son identifier

(Integer)

  
sh3n_ID3 Third son identifier

(Integer)

  
sh3n_ID4 Fourth son identifier

(Integer)

  
Actlev Actual level of 3-node shell sh3n_ID. 6

(Integer)

  
IMapping Mapping flag or deletion at the beginning of this stage, 8
= -1
The 3-node shell and all the shells coming from it are deleted.
= 0
The element is not deleted and no element is activated at a deeper level, unless it was already active in the previous stage. Necessarily, the element remains active (resp. inactive) if it was active (resp. inactive) in the previous stage.
= 1
Some 3-node shells will be activated at a deeper level, but were not previously. Then fields mapping (stresses, etc.) will occur at the beginning of this stage for activating this deeper level.

(Integer)

  

Comments

  1. This keyword is compulsory for multi-stage analysis in case of adaptive mesh. It allows running a second stage after the first one using adaptivity, by retrieving the hierarchical data structure of the adaptive mesh.
  2. This block can be written with /STATE/DT option in Radioss Engine.
  3. The full hierarchical data structure of the adaptive mesh from level 0 to Levelmax (given in /ADMESH/GLOBAL) must be provided.
  4. Sons of 3-node sh3n_ID must be given in the following order - assuming that connectivity of 3-node sh3n_ID is (N1, N2, and N3):

    starter_admesh_state_sh3n
    Figure 1.
  5. Connectivity of the four sons must be given in option /SH3N/part_ID in the following order:

    First son = (N1, a , c) N1 is the first node of first son and first son is orientated the same way as the parent sh3n_ID

    Second son = (a, N2, b) N2 is the second node of second son and second son is orientated the same way as the parent sh3n_ID

    Third son = (c, b, N3) N3 is the third node of third son and third son is orientated the same way as the parent sh3n_ID

    Fourth son = (b, c, a)

  6. Actlev is:

    Actlev = level, the true level of the 3-node shell in the previous stage, if it was active (level goes from 0 to Levelmax value given in /ADMESH/GLOBAL).

    Actlev = -(level+1), if the 3-node shell was not active in the previous stage.

  7. The full stress tensor, strain tensor are supposed to be provided for all active 3-node shells in the previous stage (Actlec ≥ 0), using /INISHE/STRS_F/GLOB or /INISH3/STRS_F/GLOB and /INISHE/STRA_F or /INISH3/STRA_F.
  8. The flag IMapping allows you to enforce the deletion of some 3-node shells or activation of some 3-node shells at a deeper level than in the previous stage.
  9. In Adaptive Meshing, Node ID and shell ID are limited to < 900000000.