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Surface nodes are nodes on the face of a region that are not covered by another region containing a material. Boundary nodes are dummy nodes used to represent the temperature of the environment to which a surface is exposed. Boundary temperatures are specified as input to the code. These temperatures are only used to calculate the heat flow across a boundary surface. The boundary condition types are the following: 1. the temperature on the surface of a region can be constant or a function of time and/or position; 2.

4. Regions defining a two-dimensional rectangular model with indentation. C. NOS. V REGIONNOS. _ X x Fig. 5. Regions defining a two-dimensional rectangular model with boundary conditions. C. NOS.. _7 REGIONNOS" Fig. 6. dimensional rectangular w_--delinvolving surface-to-surface boundary conditions, incompatible with HEATING. Y ................ Lit. :::::... :. :: ........ -__:_! _,: _-: ....... :'g_4 ::'::_::_':::{::"::::::':: .................. _"_{__ _:': ___t REGIONNOS. C. NOS. V Fig. 7. Regions defining a two-dimensional rectangular model involving surface-to-surface boundazy conditions.

V for nodal volume Fine grid lines along first axis . , m Fine grid lines along second axis w, , . /. umontr catted from sssor, dirsot, tranex, and tranim at the end of each iteration or time step. usrprt catted from sumary at output times. nds common /monrpt/ it1, it2, icdt is, tvgt is, ismrcv, ismvg, id, iu, iaa, i t3, • it4, idiag, ih,_ common /monipt/ nb, nrd:,npt,nvg,ntpi ,ntpj ,ntpk,mreg,ntl ,hbt ist, • nns,nst ist,ngt ist,npdbtp, tudcep, tuck:on, tudgen, tudpro, tfixtp common /moncon/ nnc,nct i st,nlxv_, icnt is,nltmp,n2tmp,nbctmp common /monp¢ / istcap, ixl,nphsch,npctst C c c c c these common btocks supply the number of nodes and the current time (nt and tim, respectivety).

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