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Material phase change must be considered in many thermal applications, and SINDA/G provides basic phase change modeling subroutines. The routines hold the temperature of a multiphase node constant during phase change while the integrated energy absorbed/released is compared to the latent heat capacity of the node. Once the latent heat capacity is exhausted, the temperature is released allowing it to change once again. This method provides useful approximations for many applications, but can be insufficient for simulating phase boundary propagation. This paper illustrates application of the SINDA/G phase change capability. Modeling methods to accurately simulate one-dimensional phase boundary propagation are described with example analyses.

Over the past decade, the use of numerical modeling and simulation in the design and development process has grown dramatically. Increasingly sophisticated user requirements coupled with ever decreasing computer costs fueled this growth. During this time, commercially available analysis codes have improved, becoming both more powerful and user friendly. Many programs, once requiring mainframe computers, now can be run on PC platforms. One such program is SINDA/G, a long accepted standard for thermal analysis in the aerospace industry. This paper describes SINDA/G's evolution over the last 10 years to meet these increasingly demanding and challenging user needs.