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$$$$ TRIE     NOTICE  BP208322  12/12/20    21:15:29     7632           
                                             DATE     12/12/20
                                         
 
    Operateur TRIE                            
    --------------
    

    ------------------------------------------------------------
    Syntax 1: sort elements according to level set functions
    ------------------------------------------------------------    

       MCHAM1 |      | =  TRIE  MO1 CHP1 CHP2 |        | ;
              |      |                        | 'SAUT' |
              | REL1 |                        | 'DESE' |
                                

    Description :
    ____________

    The TRIE operator select element from xfem model and compute 
    a MCHAML object of enrichment.
    When 'SAUT' is present, the displacement approximation is only
    H-enriched, the crack tip has to be on an element edge.
    When 'DESE' is present, old crack tip's enrichments are 
    progressively droppen : the one associated with crack tip at 
    time n-1 is forgotten, the one of time n is imposed to 0 (with REL1)
    and the present one (time n+1) is added.


    Comments :
    _________

    
    MO1 (I/O) : MMODEL object with xfem element to sort/
                MMODEL object with sorted xfem element
    
    CHP1,CHP2 (I) : the two CHPOINT objects representing level sets

    MCHAM1 (O) : MCHAML object of enrichment.

    'SAUT' : optional keyword to avoid crack tip enrichment
    
    'DESE' : optional keyword to enable step-by-step change of crack tip
             enrichment
    

    ------------------------------------------------------------
    Syntax 2: sort elements according to a prescribed enrichment
    ------------------------------------------------------------    

       TRIE  MO1 MCHAM1;
                                

    Description :
    ____________

    The TRIE operator sort the elements of xfem model from the given 
    MCHAML object of enrichment (built with syntax 1 of TRIE).
    It enables to re-build the model at the configuration associated
    with MCHAM1
    
    
    Comments :
    _________

    
    MO1 (I/O) : MMODEL object with xfem element to sort/
                MMODEL object with sorted xfem element
    
    MCHAM1 (I) : MCHAML object of enrichment.

 
 
 
 

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