This paper introduces the CAD user interface software developed to support example-driven simulations using the PAK finite element code. Built upon years of research and development by the authors, CAD represents a custom-built platform for three-dimensional model setup and result visualization, tightly integrated with the PAK solver. It facilitates the creation of simulation-ready models and enables dynamic rendering and animation of computed results. The software is versatile, supporting a broad spectrum of applications, including solid mechanics, fluid dynamics, heat transfer, electrophysiology, drug transport, and composite material modeling. By integrating advanced meshing algorithms and numerical solvers, the software streamlines the workflow, making high-fidelity simulations accessible to researchers, engineers, and educators. Beyond its core capabilities, CAD has evolved into a modular and extensible framework, incorporating specialized tools for multi-physics and multi-scale modeling. Its architecture draws on a lineage of domain-specific simulation platforms, now unified into a single environment that supports complex coupled phenomena. The paper first outlines the structure and development of the CAD interface, followed by practical guidance for executing selected examples available through the online repository, including applications in biomechanics, cardiovascular modeling, and porous media transport.
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