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Code Manual for CONTAIN 2.0 - Federation of American Scientists

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DENDRP<br />

= dendrp<br />

SURTEN<br />

= surten<br />

RADGAS<br />

= radgas<br />

CELL block. A value greater than or equal to one must be specified. Default<br />

= 1.<br />

the user-specified density <strong>for</strong> the airborne debris fields. If this is omitted, as<br />

is generally recommended, then the density <strong>of</strong> each field will be computed at<br />

each timestep from the density <strong>of</strong> the species present in the field at that time.<br />

The density <strong>of</strong> each species will be taken from the user-defined RHO or<br />

RHOT material table in the USERDAT input block. (kg/m3)<br />

surface tension <strong>of</strong> debris. SURTEN can be overridden at the cell level only<br />

if the TOF/KU model is invoked. The global value is normally used in the<br />

entrainment models, if they are invoked; see, however, the discussion <strong>of</strong><br />

SURTEN in the DCH-CELL input described in Section 14.3.1.11. Default<br />

= 1. (N/m)<br />

the radiation blackbody multiplier <strong>for</strong> radiative heat exchange between the<br />

debris and the atmosphere in a cell. This corresponds to debris-to-gas black<br />

body multiplier, s~.~,in Equation (6-157). The sum <strong>of</strong> “rad.rmd”ad “radgd’<br />

should be less than or equal to 1. This input may also be specified in the<br />

DCH-CELL block. Default= 1.<br />

RADMUL the radiation blackbody multiplier <strong>for</strong> radiative heat exchange between the<br />

= radmul debris and structure surfaces in a cell. This corresponds to the debris-tosurface<br />

black body multiplier, e~.,,in Equation (6-158). The sum <strong>of</strong> “radmul”<br />

and “radgas” should be less than or equal to 1. This input may also be<br />

specified in the DCH-CELL block. Default= O.<br />

GASSUR<br />

= gassur<br />

DIF02<br />

= difo2<br />

the value <strong>of</strong> the total gas emissivity to use with regard to gas-to-surface heat<br />

transfer, in place <strong>of</strong> the standard emissivity (see Chapter 6) during gas-debris<br />

interactions. Such surfaces include those <strong>of</strong> heat transfer structures, coolant<br />

pools, and the heat sinks <strong>of</strong> engineered systems. The value <strong>of</strong> “gassur” is<br />

used in the interval defined by the STARTIME and STOPTIME keywords to<br />

allow <strong>for</strong> deviations from the standard model, which does not take into<br />

account the presence <strong>of</strong> suspended debris. (This option supersedes the<br />

obsolete negative “kmx” option, which overrides the standard model <strong>for</strong> all<br />

time.) A zero or negative value <strong>for</strong> “gassur” will result in the use <strong>of</strong> the<br />

standard model.<br />

the multiplier on the mass transfer coefficient <strong>for</strong> the transport <strong>of</strong> oxygen to<br />

the surface <strong>of</strong> drops as determined using the mechanistic mass transfer<br />

correlation. This parameter is not shown in Section 6.4; however, the rate<br />

given by Equation (6-122) is simply multiplied by this value. This parameter<br />

may also be specified in the DCH-CELL block. Default= 1.<br />

Rev O 14 47 6/30/97

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