Altair Flow Simulator is a comprehensive 3D design tool that facilitates interdisciplinary modeling and optimization of fluid and thermal systems within a CAD-integrated environment. Originally developed by GE Aviation to simulate complex gas turbine applications, it now supports a wide range of industries, including electromobility, renewable energy, and electronics design. The software enables engineers to perform system-level simulations, from initial concept modeling to in-depth analysis, ensuring efficient product development cycles. Key Features and Functionality: - Fully Coupled Flow and Thermal Network Modeling: Offers an extensive library of preconfigured elements and components, utilizing publicly available experimental data for accurate pressure drop and heat transfer characteristics. - Intuitive Interface: Provides a modern, user-friendly interface that integrates seamlessly with 3D CAD environments, allowing for efficient modeling, optimization, and post-processing. - Control System Module: Incorporates proportional-integral-derivative controllers and feedforward mechanisms, enabling optimization of machine operations during cycle or mission analyses. - Optimization Module: Utilizes Monte Carlo, Optimal Latin Hypercube, and N-factorial analyses to explore the entire design space, facilitating cost-effective and efficient design solutions. - User-Defined Elements: Allows integration of custom intellectual property and element formulations through flexible Python scripting and Fortran language support, enhancing adaptability to specific project requirements. Primary Value and Problem Solving: Altair Flow Simulator addresses the need for efficient and accurate system-level simulations in complex fluid and thermal systems. By providing a multidisciplinary, multiphysics, and mixed-fidelity approach, it enables engineers to rapidly iterate designs, understand system behaviors, and optimize performance without leaving their familiar CAD environment. This leads to faster product development, reduced costs, and improved system reliability across various applications, including turbomachinery, energy systems, and mobility solutions.