Code Manual for CONTAIN 2.0 - Federation of American Scientists

This requirement of continuous behavior gives rise to constraints on the values of “chrlen” that are
allowed for each structure orientation and condition when ADJUSTCL is specified.
When ADJUSTCL is specified, the characteristic lengths used in each case have the form
L = max(min(’’chrlen’’,LO),0.001)
where the definition of ~ and the constraint on “chrlen” in each case is given by
L1 +-Jsb:;,:
(unsubmerged ceiling with “chrlen” < H,, - H,j)
(submerged ceiling with “chrlen” < H,~- H~j)
=H~-l$: (unsubmerged wall with “chrlen” < H,, - H,,)
GHp,i_ H,~ (submerged wall with “chrlen” < H,, - H,,)
= H~,i_ H,, (unsubmerged floor with “chrlen” < ~,i - H,,)
z ~,i _ H~~ (submerged floor with “chrlen” < H,i - H,,)
(10-13)
where ~ is the elevation at the bottom edge of the structure, H~,iis the pool surface elevation, H,~
is the elevation at the top of the structure, H~j is the cell bottom elevation, and H~jis the cell top
elevation. Note that if “chrlen” does not satisfy the appropriate inequality in the above equations,
the code will not accept the ADJUSTCL keyword until “chrlen” is changed.
The characteristic lengths used at the gas-pool and gas-lower-cell interfaces depend on whether the
atmosphere or pool of a cell is considered coupled to the cell above or below, respectively. The
presence or absence of coupling is determined by whether the user has invoked the CELLOVER or
CELLUNDR keywords in the cell GEOMETRY block discussed in Section 14.3.1.1. If
CELLOVER is used to define the overlying cell “icello” and the pool is empty or absent in “icello,”
then the atmosphere is considered coupled to that of “icello.” Similarly, if the CELLUNDR keyword
is used to define an underlying cell “icellu,” then the pool is considered coupled to that of icellu.”
Otherwise the atmosphere and pool are considered decoupled. The characteristic length for gas-pool
or gas-lower-cell interfaces, with respect to determining decoupled gas boundary layer properties,
is taken to be
‘=4Hti-HpiF
(10-14)
where ~ is the area of the pool surface or lower cell layer. The characteristic length for gas-pool
interfaces, with respect to determining decoupled pool boundary layer properties, or for pool-lowercell
interfaces is taken to be
Rev O 10-13 6/30/97