Code Manual for CONTAIN 2.0 - Federation of American Scientists

NSECTN
= nsectn
NAC
= nac
NUMTBG
= numtbg
MAXTBG
= maxtbg
NTGT
= ntgt
the number of aerosol particle sections or sizes (20 is typical; the maximum
is given by the geometric constraint vi+l/vi>2, given in Equation (7-4)).
Default = O.
the number of aerosol components specified in the AEROSOL block as
described in Section 14.2.4. Maximum= 8. Default = O.
the number of global tables used. This number should be incremented by one
for each global table. Examples of such tables include AERTIM, VAR-
AREA, and engineered vent table options (e.g., AREA-T). Such tables are
considered to be at the global level since these options are processed at that
level. Each such table specifies one dependent variable in terms of an
independent variable as explained in Section 14.4.2. Default= O.
the maximum number of entries used in any one global table. Default= O.
a number that reserves space for the targeted release and acceptance model.
Ih theory, the exact value of “ntgt” required can be determined by following
the procedure described below; however, in practice it is preferable to simply
estimate “ntgt” with a sufficiently large value. For many calculations, the
default of 1000 will be adequate; however, for certain large calculations,
particularly when many target lines or the fission product library are used,
larger values may be required.
In order to calculate the exact value of “ntgt” the total number of FROMiTO
host pairs in all TARGET input blocks must be determined. A host name and
a fission product name or a volatility group name are identified in each such
line. Each host name corresponds to a number of actual hosts, denoted here
as “rd.” If the host name is a generic structure type, such as “wall,” then “nl”
will be the total number of wall surfaces in the cell of interest otherwise “rd”
will be 1. The fission product or volatility group corresponds to a number of
linear chain elements, denoted here as “n2.” For example, if the G-TARGET
option is used then “n2” will correspond to the number of chain elements
belonging to the volatility group named in the target line. If the G-TARGET
option is not used, but the fission product appears in two linear chains, then
“n2” for that fission product will be 2. The exact value of “ntgt” needed will
be the sum of the product “nl “x’’n2”for every FROM./TO target line in the
input deck. Clearly, determining this value can be a tedious process;
therefore, it is recommended that “ntgt” simply be given as an estimated large
value. If the value is not large enough, the code will generate diagnostic and
abort. In this event, simply increase the value of “ntgt” and try again. Default
= 1000.
O 14 11 6/30/97