/ADMESH/SET
Block Format Keyword Defines the criteria for adaptive meshing in parts. This keyword is not available for SPMD computation.
Format
(1)  (2)  (3)  (4)  (5)  (6)  (7)  (8)  (9)  (10) 

/ADMESH/SET/adset_ID  
adset_title  
Angle Criterion  Inilev  Thkerr  
ID_{1}  ID_{2} 
Definitions
Field  Contents  SI Unit Example 

adset_ID  Set for adaptive
meshing block identifier (Integer, maximum 10 digits) 

adset_title  Set for adaptive
meshing block name (Character, maximum 100 characters) 

Angle Criterion  Angle criterion for
mesh refinement. 3 (Real) 
$\left[\mathrm{deg}\right]$ 
Inilev  Initial level of
refinement.
(Integer) 

Thkerr  Criterion based upon
estimated thickness error. 4 (Real) 
$\left[\text{m}\right]$ 
ID_{1}, ID_{2}  IDs of parts declared
for adaptive meshing within this set. (Integer, maximum 10 per format) 
Comments
 Several sets of parts may be declared for adaptivity, each using for instance, different angle criteria.
 A part declared for adaptivity can include 4node shell elements or 3node shell elements and use any shell element formulation; except DKT18 and DKT_S3 formulations for triangles.
 The Angle
Criterion (degrees) defines the maximum angle between two neighboring
elements; if this angle is reached, elements will be subdivided.The element normal is checked versus the averaged normal at nodes as:
 Element Normal is computed at the maximum level and normalized.
 Averaged normal at nodes are computed:
(1) $${N}_{i}={\displaystyle \sum _{e}\frac{{N}_{e}}{\Vert {N}_{e}\Vert}}$$  Normal at nodes is normalized.
 For each active element that is not at maximum level, the angle between
its normal and the normal at its nodes is computed; and if this angle is
greater than the defined criterion, the element is divided.
 If
Thkerr > 0, a thickness error estimation is computed as
follows:Nodal thickness is computed as:
(2) $$\overline{t}=\frac{{\displaystyle \sum _{k}A\left({E}_{k}\left(n\right)\right)t\left({E}_{k}\left(n\right)\right)}}{{\displaystyle \sum _{k}A\left({E}_{k}\left(n\right)\right)}}$$Where, $A\left({E}_{k}\left(n\right)\right)$ and $t\left({E}_{k}\left(n\right)\right)$ are the area and thickness of element ${E}_{k}\left(n\right)$ containing node $n$ .
Then the thickness error is evaluated for each element, $E$ using the formula:(3) $${e}_{t}=\frac{1}{{A}_{E}}\underset{{A}_{E}}{\int}\left\frac{t\overline{t}}{t}\right$$If the thickness error is greater than the criterion Thkerr, the element is divided.
 The Angle and thickness error criteria are only checked at frequency defined through "Time delay" format provided in /ADMESH/GLOBAL.
 Criteria Angle criterion and Thkerr can be used separately or combined.
 In Adaptive Meshing, Node ID and shell ID are limited to < 900000000.