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221 lines
7.2 KiB
221 lines
7.2 KiB
2 years ago
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\chapter{The EXODUS Database Format} \label{appx:exodus}
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The following code segment reads an EXODUS database. The first segment
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is the GENESIS database format.
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\begin{verbatim}
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C --Open the EXODUS database file
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NDB = 9
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OPEN (UNIT=NDB, ..., STATUS='OLD', FORM='UNFORMATTED')
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C --Read the title
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READ (NDB) TITLE
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C --TITLE - the title of the database (CHARACTER*80)
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C --Read the database sizing parameters
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READ (NDB) NUMNP, NDIM, NUMEL, NELBLK,
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& NUMNPS, LNPSNL, NUMESS, LESSEL, LESSNL, NVERSN
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C --NUMNP - the number of nodes
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C --NDIM - the number of coordinates per node
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C --NUMEL - the number of elements
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C --NELBLK - the number of element blocks
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C --NUMNPS - the number of node sets
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C --LNPSNL - the length of the node sets node list
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C --NUMESS - the number of side sets
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C --LESSEL - the length of the side sets element list
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C --LESSNL - the length of the side sets node list
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C --NVERSN - the file format version number
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C --Read the nodal coordinates
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READ (NDB) ((CORD(INP,I), INP=1,NUMNP), I=1,NDIM)
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C --Read the element order map (each element must be listed once)
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READ (NDB) (MAPEL(IEL), IEL=1,NUMEL)
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\end{verbatim}
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\newpage
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\begin{verbatim}
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C --Read the element blocks
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DO 100 IEB = 1, NELBLK
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C --Read the sizing parameters for this element block
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READ (NDB) IDELB, NUMELB, NUMLNK, NATRIB
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C --IDELB - the element block identification (must be unique)
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C --NUMELB - the number of elements in this block
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C -- (the sum of NUMELB for all blocks must equal NUMEL)
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C --NUMLNK - the number of nodes defining the connectivity
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C -- for an element in this block
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C --NATRIB - the number of element attributes for an element
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C -- in this block
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C --Read the connectivity for all elements in this block
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READ (NDB) ((LINK(J,I), J=1,NUMLNK, I=1,NUMELB)
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C --Read the attributes for all elements in this block
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READ (NDB) ((ATRIB(J,I), J=1,NATRIB, I=1,NUMELB)
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100 CONTINUE
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\end{verbatim}
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\newpage
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\begin{verbatim}
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C --Read the node sets
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READ (NDB) (IDNPS(I), I=1,NUMNPS)
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C --IDNPS - the ID of each node set
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READ (NDB) (NNNPS(I), I=1,NUMNPS)
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C --NNNPS - the number of nodes in each node set
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READ (NDB) (IXNNPS(I), I=1,NUMNPS)
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C --IXNNPS - the index of the first node in each node set
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C -- (in LTNNPS and FACNPS)
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READ (NDB) (LTNNPS(I), I=1,LNPSNL)
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C --LTNNPS - the nodes in all the node sets
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READ (NDB) (FACNPS(I), I=1,LNPSNL)
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C --FACNPS - the factor for each node in LTNNPS
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C --Read the side sets
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READ (NDB) (IDESS(I), I=1,NUMESS)
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C --IDESS - the ID of each side set
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READ (NDB) (NEESS(I), I=1,NUMESS)
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C --NEESS - the number of elements in each side set
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READ (NDB) (NNESS(I), I=1,NUMESS)
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C --NNESS - the number of nodes in each side set
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READ (NDB) (IXEESS(I), I=1,NUMESS)
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C --IXEESS - the index of the first element in each side set
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C -- (in LTEESS)
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READ (NDB) (IXNESS(I), I=1,NUMESS)
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C --IXNESS - the index of the first node in each side set
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C -- (in LTNESS and FACESS)
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READ (NDB) (LTEESS(I), I=1,LESSEL)
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C --LTEESS - the elements in all the side sets
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READ (NDB) (LTNESS(I), I=1,LESSNL)
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C --LTNESS - the nodes in all the side sets
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READ (NDB) (FACESS(I), I=1,LESSNL)
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C --FACESS - the factor for each node in LTNESS
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\end{verbatim}
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\newpage
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A valid GENESIS database may end at this point or at any point until the
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number of variables is read.
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\begin{verbatim}
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C --Read the QA header information
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READ (NDB, END=900) NQAREC
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C --NQAREC - the number of QA records (must be at least 1)
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DO 110 IQA = 1, MAX(1,NQAREC)
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READ (NDB) (QATITL(I,IQA), I=1,4)
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C --QATITL - the QA title records; each record contains:
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C -- 1) analysis code name (CHARACTER*8)
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C -- 2) analysis code qa descriptor (CHARACTER*8)
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C -- 3) analysis date (CHARACTER*8)
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C -- 4) analysis time (CHARACTER*8)
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110 CONTINUE
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C --Read the optional header text
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READ (NDB, END=900) NINFO
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C --NINFO - the number of information records
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DO 120 I = 1, NINFO
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READ (NDB) INFO(I)
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C --INFO - extra information records (optional) that contain
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C -- any supportive documentation that the analysis code
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C -- developer wishes (CHARACTER*80)
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120 CONTINUE
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C --Read the coordinate names
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READ (NDB, END=900) (NAMECO(I), I=1,NDIM)
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C --NAMECO - the coordinate names (CHARACTER*8)
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C --Read the element type names
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READ (NDB, END=900) (NAMELB(I), I=1,NELBLK)
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C --NAMELB - the element type names (CHARACTER*8)
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\end{verbatim}
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The GENESIS section of the database ends at this point.
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\newpage
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\begin{verbatim}
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C --Read the history, global, nodal, and element variable information
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READ (NDB, END=900) NVARHI, NVARGL, NVARNP, NVAREL
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C --NVARHI - the number of history variables
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C --NVARGL - the number of global variables
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C --NVARNP - the number of nodal variables
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C --NVAREL - the number of element variables
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READ (NDB)
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& (NAMEHV(I), I=1,NVARHI),
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& (NAMEGV(I), I=1,NVARGL),
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& (NAMENV(I), I=1,NVARNP),
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& (NAMEEV(I), I=1,NVAREL)
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C --NAMEHI - the history variable names (CHARACTER*8)
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C --NAMEGV - the global variable names (CHARACTER*8)
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C --NAMENV - the nodal variable names (CHARACTER*8)
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C --NAMEEV - the element variable names (CHARACTER*8)
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READ (NDB) ((ISEVOK(I,J), I=1,NVAREL), J=1,NELBLK)
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C --ISEVOK - the name truth table for the element blocks;
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C -- ISEVOK(i,j) refers to variable i of element block j;
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C -- the value is 0 if and only if data will NOT be output for
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C -- variable i for element block j (otherwise the value is 1)
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\end{verbatim}
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\newpage
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\begin{verbatim}
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C --Read the time steps
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130 CONTINUE
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READ (NDB, END=900) TIME, HISTFL
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C --TIME - the time step value
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C --HISTFL - the time step type flag:
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C -- 0.0 for all variables output ("whole" time step) else
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C -- only history variables output ("history-only" time step)
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C
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READ (NDB) (VALHV(IVAR), IVAR=1,NVARGL)
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C --VALHV - the history values for the current time step
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IF (HISTFL .EQ. 0.0) THEN
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READ (NDB) (VALGV(IVAR), IVAR=1,NVARGL)
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C --VALGV - the global values for the current time step
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DO 140 IVAR = 1, NVARNP
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READ (NDB) (VALNV(INP,IVAR), INP=1,NUMNP)
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C --VALNV - the nodal variables at each node
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C -- for the current time step
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140 CONTINUE
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DO 160 IBLK = 1, NELBLK
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DO 150 IVAR = 1, NVAREL
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IF (ISEVOK(IVAR,IBLK) .NE. 0) THEN
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READ (NDB) (VALEV(IEL,IVAR,IBLK),
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& IEL=1,NUMELB(IBLK))
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C --VALEV - the element variables at each element
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C -- for the current time step
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END IF
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150 CONTINUE
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160 CONTINUE
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END IF
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C --Handle time step data
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...
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GOTO 130
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900 CONTINUE
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C --Handle end of file on database
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...
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\end{verbatim}
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