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Code Manual for CONTAIN 2.0 - Federation of American Scientists

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nvisc the number <strong>of</strong> temperature-viscosity pairs that follow.<br />

vtemp the temperature values <strong>for</strong> which the viscosities are provided.<br />

viscosity the viscosity values. (kg/m-s)<br />

SPH the keyword <strong>for</strong> speci@ing specific heat input. The specific heat is by default<br />

the derivative <strong>of</strong> the enthalpy table values.<br />

nsph the number <strong>of</strong> temperature-specific heat pairs that follow.<br />

stemp the temperature values <strong>for</strong> which the specific heats are provided.<br />

spheat the specific heat values. (J/kg-K)<br />

14.2.1.2 DCH User-Defined Material humt. DCH calculations require the user to specir the names<br />

and properties <strong>of</strong> the debris species that can be present. This is done using the user-defined material<br />

input, as described in Section 14.2.1.1. The one very important difference between DCH userdefined<br />

materials and other user-defined materials is that the phase type <strong>for</strong> DCH material is<br />

DEBRIS; i.e., the word DEBRIS is specified after the material name in the USERDAT input block.<br />

Within the code the phase number <strong>for</strong> debris will be 4, which is distinct from the phase numbers <strong>for</strong><br />

gas (1), liquids (2), and solids (3). The DEBRIS phase type is extremely important, since this is the<br />

only way the code knows that the DCH species given in the USERDEF list are to be treated as<br />

species in the debris field. Exactly “ndhspc” <strong>of</strong> the specified materials in the USERDEF block must<br />

be DCH materials, where “ndhspc” is given in the global control block.<br />

The DCH model recognizes the following specific names <strong>of</strong> materials as reactive metals: ZRD,<br />

ALD, CRD, and FED. These names and only these names may be used as reactive zirconium,<br />

aluminum, chromium, and iron, respectively. The following oxide names must also be specified if<br />

the corresponding metal is given: ZR02D, ALOXD, CROXD, and FEOD. Again, these names and<br />

only these names will be recognized as the oxide products <strong>of</strong> the four reactive metals. Any number<br />

<strong>of</strong> additional material species with any name maybe specified in addition to the special four species<br />

above. Any such species will be treated as chemically inert and will be assumed to reside in the<br />

oxide phase, even if the name suggests that it is a metal.<br />

At least one <strong>of</strong> the DCH user-defined metals must be named in order to model chemical reactions<br />

<strong>of</strong> debris in the atmosphere. Also, if a metal is specified then its oxide must also be specified in the<br />

USERDEF block. For example, if FED is specified, then FEOD must also be specified since FED<br />

(iron) is assumed to oxidize to FEOD (iron oxide). If either <strong>of</strong> these rules is violated, an input<br />

diagnostic will be given and the calculation will not proceed. An oxide can be specified, however,<br />

without specifying its metal counterpart.<br />

A few things are important to note about the material property data tables <strong>for</strong> DCH. First, the oxides<br />

ALOXD and CROXD correspond to AIO1.~and CrOl~ respectively. These names must be used if<br />

CRD and ALD reactive metals are also present. Second, the molecular weight <strong>of</strong> these oxides must<br />

Rev O 14-19 6/30/97

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