SAËNS 087: A Reproducible Multiphysics Simulation Architecture for Auxetic Carbon Metastructures, GaN Thermal Management, and Thermodynamic-Ledger Validation

SAËNS 087 presents a Stage 0 computational research framework for evaluating auxetic carbon-based thermal-management concepts for gallium nitride (GaN) devices. The work is intended to support reproducible numerical investigation of coupled thermal, structural, and phonon-transport behavior while maintaining a clear distinction between literature-supported material properties, engineering assumptions, design targets, and unvalidated model outputs. The framework emphasizes conservation checks, numerical convergence, parameter provenance, control cases, uncertainty reporting, and independent reproducibility before any predicted performance is treated as scientifically established. Previously reported performance values associated with this research lineage are retained only as historical model outputs and are not presented as experimental measurements or independently validated results. Version 2 corrects mathematical notation and presentation in the governing-equation section and corrects the thermoelastic constitutive formulation so that the published expressions are consistent with the intended small-strain formulation. These corrections improve technical clarity without changing the evidentiary status of the work, introducing experimental validation, or promoting any Stage 0 prediction to a verified result. SAËNS 087 remains an unbenched, pre-experimental computational architecture intended to define the requirements for future independent implementation, validation, falsification, and controlled comparison.