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188 lines
6.2 KiB
188 lines
6.2 KiB
2 years ago
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C Copyright(C) 1999-2020 National Technology & Engineering Solutions
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C of Sandia, LLC (NTESS). Under the terms of Contract DE-NA0003525 with
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C NTESS, the U.S. Government retains certain rights in this software.
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C
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C See packages/seacas/LICENSE for details
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SUBROUTINE TETSRC(
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* NDIM, NPTS, NPSRF, NFSRF, NISR,
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* NRSR, NRSS, XYZE, XYZP, LS,
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* ISRCHR, RSRCHR, IPT, IELT, IERR )
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C-----------------------------------------------------------------------
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C DESCRIPTION:
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C THIS SUBROUTINE CALCULATES THE CLOSEST POINT PROBLEM
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C BETWEEN 'KOUNTS' PAIRS OF POINTS AND SURFACES.
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C-----------------------------------------------------------------------
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C FORMAL PARAMETERS
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C MEMORY : P=PERMANENT, S=SCRATCH
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C NAME : IMPLICIT A-H,O-Z REAL, I-N INTEGER
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C TYPE : INPUT_STATUS/OUTPUT_STATUS (I=INPUT,O=OUTPUT,P=PASSED,
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C U=UNMODIFIED,-=UNDEFINED)
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C DESCRIPTION : DESCRIPTION OF VARIABLE
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C-----------------------------------------------------------------------
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C CALLING ARGUMENTS
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C MEMORY NAME TYPE DESCRIPTION
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C --- ---- --- -----------
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C P NDIM I/U DIMENSION OF PROBLEM=3
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C P NPTS I/U NUMBER OF POINTS TO BE SEARCHED
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C P NPSRF I/U NUMBER OF POINTS THAT DEFINE THE SURFACE
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C P NFSRF I/U NUMBER OF SURFACES
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C P NISR I/U NUMBER OF INTEGER SEARCH RESULTS (>=1)
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C P NRSR I/U NUMBER OF REAL SEARCH RESULTS (>=4)
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C P NRSS I/U NUMBER OF REAL SEARCH SCRATCH MEMORY (=10)
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C P XYZE I/U XYZ COORDS OF POINTS DEFINING ELEMENT
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C P XYZP I/U XYZ COORDS OF POINTS TO BE SEARCHED
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C P LS I/U CONNECTIVITY OF ELEMENTS (8*NFSRF),
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C NUMBERS REFER TO LOCATIONS IN XYZE ARRAY
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C P ISRCHR I/O INTEGER SEARCH RESULTS
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C P RSRCHR I/O REAL SEARCH RESULTS
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C P IPT I/U POINT PAIRED WITH SURFACE IELT
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C P IELT I/U SURFACE PAIRED WITH POINT IPT
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C-----------------------------------------------------------------------
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include 'toldat.blk'
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include 'tapes.blk'
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C INPUT/OUTPUT ARRAYS
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DIMENSION
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* XYZP(NPTS,NDIM) ,XYZE(NPSRF,NDIM) ,LS(4,NFSRF) ,
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* ISRCHR(NISR,NPTS) ,RSRCHR(NRSR,NPTS)
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DIMENSION XX(27), YY(27), ZZ(27)
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IF( NISR .LT. 1 .OR. NRSR .LT. 3 .OR. NRSS .LT. 10 )THEN
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IERR = 1
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RETURN
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ENDIF
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C check for Mesh-B point coincident with node of element in Mesh-A
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SIDE1 = (XYZE(LS(1,IELT),1)-XYZE(LS(2,IELT),1))**2
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& + (XYZE(LS(1,IELT),2)-XYZE(LS(2,IELT),2))**2
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& + (XYZE(LS(1,IELT),3)-XYZE(LS(2,IELT),3))**2
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SIDE2 = (XYZE(LS(1,IELT),1)-XYZE(LS(3,IELT),1))**2
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& + (XYZE(LS(1,IELT),2)-XYZE(LS(3,IELT),2))**2
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& + (XYZE(LS(1,IELT),3)-XYZE(LS(3,IELT),3))**2
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SIDE3 = (XYZE(LS(1,IELT),1)-XYZE(LS(4,IELT),1))**2
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& + (XYZE(LS(1,IELT),2)-XYZE(LS(4,IELT),2))**2
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& + (XYZE(LS(1,IELT),3)-XYZE(LS(4,IELT),3))**2
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SIDE4 = (XYZE(LS(2,IELT),1)-XYZE(LS(3,IELT),1))**2
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& + (XYZE(LS(2,IELT),2)-XYZE(LS(3,IELT),2))**2
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& + (XYZE(LS(2,IELT),3)-XYZE(LS(3,IELT),3))**2
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SIDE5 = (XYZE(LS(2,IELT),1)-XYZE(LS(4,IELT),1))**2
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& + (XYZE(LS(2,IELT),2)-XYZE(LS(4,IELT),2))**2
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& + (XYZE(LS(2,IELT),3)-XYZE(LS(4,IELT),3))**2
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SIDE6 = (XYZE(LS(3,IELT),1)-XYZE(LS(4,IELT),1))**2
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& + (XYZE(LS(3,IELT),2)-XYZE(LS(4,IELT),2))**2
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& + (XYZE(LS(3,IELT),3)-XYZE(LS(4,IELT),3))**2
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SIDMIN = MIN(SIDE1,SIDE2,SIDE3,SIDE4,SIDE5,SIDE6)
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COTEST = EPS*EPS*SIDMIN
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DO 110 I = 1, 4
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A = XYZE(LS(I,IELT),1) - XYZP(IPT,1)
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B = XYZE(LS(I,IELT),2) - XYZP(IPT,2)
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C = XYZE(LS(I,IELT),3) - XYZP(IPT,3)
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DIST = A**2 + B**2 + C**2
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IF (DIST .LT. COTEST)THEN
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C coincident node, so fill search results arrays
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C no need to check for better search result
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INODE = I
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ISRCHR(1,IPT) = IELT
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CALL NODE (6,INODE,RSRCHR(1,IPT),RSRCHR(2,IPT),
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& RSRCHR(3,IPT))
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GO TO 100
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END IF
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110 CONTINUE
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C Mesh-B point not coincident with Mesh-A node so compute isoparametric
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C coordinates. Use Newton's method
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SG = 0.
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TG = 0.
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RG = 0.
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ITER = 0
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C Build Jacobian and invert
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DO 120 I = 1, 4
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XX(I) = XYZE(LS(I,IELT),1)
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YY(I) = XYZE(LS(I,IELT),2)
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ZZ(I) = XYZE(LS(I,IELT),3)
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120 CONTINUE
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130 CONTINUE
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CALL JACOBN (6,XX,YY,ZZ,SG,TG,RG,A11,A12,A13,A21,A22,A23,
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& A31,A32,A33,F1,F2,F3)
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DETA = A11*(A22*A33 - A23*A32) - A12*(A21*A33 - A31*A23)
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& + A13*(A21*A32 - A31*A22)
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IF (ABS(DETA) .LT. 1.E-25)THEN
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CALL ERROR ('SRCHT',
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& 'ZERO JACOBIAN FOUND DURING NEWTON ITERATION',
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& 'MESH-A ELEMENT',IELT,
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& ' ',0,' ',' ',0)
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GO TO 100
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END IF
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AI11 = (A22*A33 - A23*A32)/DETA
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AI12 = -(A12*A33 - A32*A13)/DETA
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AI13 = (A23*A12 - A13*A22)/DETA
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AI21 = -(A21*A33 - A31*A23)/DETA
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AI22 = (A11*A33 - A13*A31)/DETA
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AI23 = -(A11*A23 - A21*A13)/DETA
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AI31 = (A21*A32 - A31*A22)/DETA
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AI32 = -(A11*A32 - A31*A12)/DETA
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AI33 = (A11*A22 - A12*A21)/DETA
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FS = F1 - XYZP(IPT,1)
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FT = F2 - XYZP(IPT,2)
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FR = F3 - XYZP(IPT,3)
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SNEW = SG - (AI11*FS + AI12*FT + AI13*FR)
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TNEW = TG - (AI21*FS + AI22*FT + AI23*FR)
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RNEW = RG - (AI31*FS + AI32*FT + AI33*FR)
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ITER = ITER + 1
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DS = ABS(SNEW-SG)
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DT = ABS(TNEW-TG)
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DR = ABS(RNEW-RG)
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IF (DS .LT. TOL .AND. DT .LT. TOL .AND. DR .LT. TOL) GO TO 300
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SG = SNEW
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TG = TNEW
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RG = RNEW
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IF (ITER .EQ. ITERMX)GO TO 100
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GO TO 130
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300 CONTINUE
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C Newton converged, load up search results arrays if appropriate
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IF (ABS(SNEW) .LT. STRLMT .AND. ABS(TNEW) .LT. STRLMT .AND.
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& ABS(RNEW) .LT. STRLMT)THEN
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C Search was adequate
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FTEST = MAX(ABS(RSRCHR(1,IPT)),ABS(RSRCHR(2,IPT)),
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& ABS(RSRCHR(3,IPT)))
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FCOMP = MAX(ABS(SNEW),ABS(TNEW),ABS(RNEW))
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IF (FTEST .GT. FCOMP .OR. ISRCHR(1,IPT) .EQ. 0)THEN
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C New search is better or first find, replace search results
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ISRCHR(1,IPT) = IELT
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RSRCHR(1,IPT) = SNEW
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RSRCHR(2,IPT) = TNEW
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RSRCHR(3,IPT) = RNEW
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END IF
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END IF
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100 CONTINUE
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RETURN
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END
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