10.08.2013 Views

Code Manual for CONTAIN 2.0 - Federation of American Scientists

Code Manual for CONTAIN 2.0 - Federation of American Scientists

Code Manual for CONTAIN 2.0 - Federation of American Scientists

SHOW MORE
SHOW LESS

You also want an ePaper? Increase the reach of your titles

YUMPU automatically turns print PDFs into web optimized ePapers that Google loves.

The following keywords are optional and may be specified independently <strong>of</strong> any other keyword.<br />

VSTATUS a keyword <strong>for</strong> specifying the initial state <strong>of</strong> a flow path. This keyword may<br />

not be used on a restart.<br />

ostat a variable speci@ng the initial state <strong>of</strong> the vent. If “ostat” = OPEN, the vent<br />

will be initially open; if “ostat” = CLOSED, it will be initially closed. By<br />

default, the vent will be initially closed if VTOPEN is specified without<br />

VDPF, VDPB, or TCLOSE or if VDPF and VDPB are specified without<br />

VTOPEN or VTCLOS. Otherwise the vent is set initially open. Note that if<br />

VDPF and VDPB are specified in addition to one <strong>of</strong> the keywords VTOPEN<br />

or VTCLOS, or if VTOPEN or VTCLOS is specfied in addition to VDPF and<br />

VDPB, or if VTOPEN and VTCLOS are both specified, the initial state <strong>of</strong> the<br />

jlow path may not be the same as in previous revisions. A diagnostic is<br />

written to the error file in these cases.<br />

VCOSN<br />

= vcosn<br />

the cosine <strong>of</strong> the angle between the vent axis and the vertical direction. The<br />

value is used to calculate aerosol settling through the vent from one cell to<br />

another. The angle is measured between the upward direction and the vent<br />

axis in the direction from “cellfm” to “cellto.” The value should be 1 if the<br />

vent goes straight up in the direction from “cellfm” to “cellto” and -1 if it<br />

goes straight down. Only the component <strong>of</strong> the aerosol settling velocities<br />

parallel to the vent axis is considered. Default= O.<br />

VCONTRA the reduction factor <strong>for</strong> the flow area due to the vena contracta. Used only<br />

= vcontra when the flow is choked. Default= 1. (dimensionless)<br />

VDPB the positive-definite pressure difference to open the vent in the backward<br />

= vdpb (negative flow) direction. This option sets the vent initially closed. If VDPB<br />

is specified, then VDPF, discussed below, must also be specified. VDPF and<br />

VDPB may be used with VTOPEN and VTCLOS as long as the times<br />

specified imply the vent is initially closed. (Pa)<br />

VDPF<br />

= vdpf<br />

VTCLOS<br />

= Vtclos<br />

VTCONS<br />

= vtcons<br />

the positive-definite pressure difference to open the vent in the <strong>for</strong>ward<br />

(positive flow) direction. See the comments regarding usage in the<br />

discussion <strong>of</strong> VDPB above. (Pa)<br />

the time at which the vent should close or begin to close. Default= 1030.<br />

(see)<br />

the time period over which the vent should open or close after a VTOPEN,<br />

VTCLOS, VDPF, or VDPB is satisfied. The area variation on opening or<br />

closing is linear in time. Because <strong>of</strong> conflicts with the table values, this<br />

option should not be used with a table option. Default = O. (s)<br />

Rev O 14 27 6/30/97

Hooray! Your file is uploaded and ready to be published.

Saved successfully!

Ooh no, something went wrong!