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About Valar Atomics At Valar Atomics, we're redefining what's possible in energy. Our mission is to make clean, high-temperature nuclear power scalable—unlocking abundant energy for industry, hydrogen, and next-generation manufacturing. We are a team of builders, engineers, and operators who believe nuclear energy should be fast to deploy, factory-made, and built for the real world. Our first pilot plant in Orangeville, Utah will demonstrate how advanced nuclear systems and fuel fabrication can power the future. Joining Valar Atomics means becoming part of a company where autonomy, ownership, and impact exist at every level. The Role At Valar Atomics, we are seeking a Computational Fluid Dynamics (CFD) Analyst to lead advanced fluid flow and thermal simulation efforts for next-generation nuclear systems. In this role, you will develop high-fidelity CFD models that support reactor design optimization, system performance evaluation, and safety analysis. You will work closely with engineering teams to solve complex thermal-fluid challenges, validate analytical methods, and help advance innovative nuclear technologies from concept through deployment. Key Responsibilities   Develop and validate CFD models for nuclear reactor systems, including thermal-hydraulic and fluid dynamics simulations using tools such as ANSYS Fluent (Preferred). Perform geometry pre-processing, mesh generation, turbulence modeling, and multiphase flow analysis to ensure accurate representation of complex physical phenomena. Integrate CFD results with experimental data and system-level models to improve predictive accuracy and reliability. Leverage AWS or other cloud platforms for large-scale simulations and computationally intensive analyses. Collaborate with cross-functional teams to define CFD requirements and incorporate insights into design and testing processes. Prepare and present technical reports and visualizations to stakeholders, clearly communicating simulation results and recommendations. You Will Be Successful in This Role If Apply strong technical expertise in fluid dynamics, heat transfer, and simulation methods to solve complex engineering problems. Develop accurate, high-quality CFD models that provide actionable insights for design improvements and performance optimization. Collaborate effectively with mechanical, nuclear, and systems engineers to integrate simulation results into real-world hardware development. Communicate complex findings clearly through concise reports, visualizations, and technical recommendations. Demonstrate curiosity and ownership by exploring innovative modeling approaches, validating assumptions, and continuously improving analysis methods. Basic Qualifications   Bachelor's or Master's Degree in Mechanical Engineering, Nuclear Engineering, Aerospace Engineering, or a related field. 3+ years of experience in CFD modeling and simulation, preferably in the energy or nuclear sector. Proficiency in ANSYS Fluent (Preferred) or similar CFD tools. Solid understanding of heat transfer, fluid mechanics, and numerical methods. Experience in performing thermal-fluid analysis, turbulence modeling, and simulation optimization. Ability to work independently and as part of a multidisciplinary team. Preferred Skills and Experience   Experience with cloud-based simulation workflows (e.g., AWS). Familiarity with model-based systems engineering (MBSE) principles. Knowledge of nuclear industry safety protocols and regulatory requirements Previous experience in the nuclear industry and familiarity with High Temperature Gas Cooled Reactors (HTGRs). Experience with multi-physics simulations (for example conjugate heat transfer, radiation, or fluid–structure interaction) is advantageous. What We Offer    Competitive base salary  Equity ownership in a rapidly growing advanced energ