deltax22.F

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!||====================================================================
!||    deltax22         ../engine/source/interfaces/int22/deltax22.F
!||--- called by ------------------------------------------------------
!||    sforc3           ../engine/source/elements/solid/solide/sforc3.F
!||--- uses       -----------------------------------------------------
!||    elbufdef_mod     ../common_source/modules/mat_elem/elbufdef_mod.F90
!||    i22bufbric_mod   ../common_source/modules/interfaces/cut-cell-search_mod.F
!||    i22tri_mod       ../common_source/modules/interfaces/cut-cell-search_mod.F
!||====================================================================
      SUBROUTINE deltax22(
     1   VOL,     VEUL,    VOLN,    DELTAX,
     2   IAD22,   IXS,     LFT,     LLT,
     3   JALE,    JEUL)
C-----------------------------------------------
C   D e s c r i p t i o n
C-----------------------------------------------
C Interface Type22 (/INTER/TYPE22) is an FSI coupling method based on cut cell method. 
C   This experimental cut cell method is not completed, abandoned, and is not an official option.
C
C this subroutines update VOLN for cut cells.
C Main cells have extended values of volume due
C to secnd cell merging. This extension data is 
C stored in cut cell buffer and is now used here
C to update VOLN(*)
C-----------------------------------------------
C   M o d u l e s
C-----------------------------------------------
      USE i22bufbric_mod 
      USE i22tri_mod
      USE elbufdef_mod
C-----------------------------------------------
C   I m p l i c i t   T y p e s
C-----------------------------------------------
#include      "implicit_f.inc"
C-----------------------------------------------
C   C o m m o n   B l o c k s
C-----------------------------------------------
#include      "param_c.inc"
#include      "inter22.inc"
C-----------------------------------------------
C   D u m m y   A r g u m e n t s
C-----------------------------------------------
      INTEGER, INTENT(INOUT) :: LFT
      INTEGER, INTENT(INOUT) :: LLT
      INTEGER, INTENT(INOUT) :: JALE
      INTEGER, INTENT(INOUT) :: JEUL
      my_real :: vol(*), veul(lveul,*), voln(*),deltax(*)
      my_real :: iad22(*)
      INTEGER :: IXS(NIXS,*)
C-----------------------------------------------
C   L o c a l   V a r i a b l e s
C-----------------------------------------------
      INTEGER :: I, II, IB, NCELL, IPOS, MCELL, NIN , NSecnds, IBV, ICELLv, NumSecnd,ISECND,NBCUT,K
      my_real :: VAR, AREAM, VOLM, VOLsecnds, FACE0, FACE0M, VOLMAST
      TYPE(POLY_ENTITY),DIMENSION(:),    POINTER    :: pIsMain 
C-----------------------------------------------
C   P r e - C o n d i t i o n s
C-----------------------------------------------
      IF(int22==0)RETURN
C-----------------------------------------------
C   S o u r c e   L i n e s
C-----------------------------------------------
      nin = 1
      
      IF(jeul+jale/=0)THEN    
        DO i=lft,llt
        
           ib        =  nint(iad22(i))
           IF(ib==0)cycle
           ncell     =  brick_list(nin,ib)%NBCUT      
           pismain(1:9) => brick_list(nin,ib)%POLY(1:9)!%IsMain
           mcell     =  brick_list(nin,ib)%MainID
           IF(mcell == 0)THEN
             deltax(i) = ep30   !don't take into account this time step, nothing is stored here since MCELL=0.
             cycle
           ENDIF
          
           !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
           !           CHARACTERISTIC LENGTH           !
           !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
           nsecnds     = brick_list(nin,ib)%SecndList%Num
           volsecnds   = sum(brick_list(nin,ib)%SecndList%VOL(1:nsecnds))
           volm        = brick_list(nin,ib)%Vnew_SCell
           mcell       = brick_list(nin,ib)%mainID
           IF(mcell==0)mcell=1
           volmast     = brick_list(nin,ib)%POLY(mcell)%Vnew
           nbcut       = brick_list(nin,ib)%NBCUT
           aream       = maxval(brick_list(nin,ib)%POLY(mcell)%FACE(1:6)%Surf)
           face0m      = zero
           DO k=1,nbcut
             face0     = brick_list(nin,ib)%PCUT(k)%Scut(1)
             face0m    = max(face0m,face0)
           ENDDO
           aream       = max(aream,face0m)
           
           !---meth1:supercell dx with 50% of brick dx (smooth time step)
           !DELTAX(I)   = HALF * DELTAX(I)
           
           !---meth2:supercell dx estimated with main cell dx (minorant)
           !DELTAX(I)   = VOLM/AREAM  
            
           !---meth3:isomorph supercell to equivalent brick(cube)
           !DELTAX(I)   = (VOLN(I))**THIRD
           
           !---meth4:isomorph main cell only to equivalent brick(cube)
           !DELTAX(I)   = VOLM**THIRD  
                    
           !---meth5: no specific treatment (FAST but only valid if time step scale factor <= 0.5 in engine file)
           !DELTAX(I)    = DELTAX(I)
           
           !---meth6: use scale factor on solid element to compute target 0.5
           !DELTAX(I)    = DTFAC22*DELTAX(I)
 
           !---meth7: Vol(main)/area_max
           deltax(i)   = volmast/aream  
           
        ENDDO
      ENDIF
 
C-----------------------------------------------
      RETURN
      END SUBROUTINE deltax22