Thermal Hydraulics Engineer

Aalo Atomics is pioneering a new era in clean energy with factory-fabricated microreactors designed to deliver affordable, scalable, and reliable nuclear power. Our mission is to make nuclear energy globally accessible, starting with the Aalo-1, a 10 MWe reactor leveraging cutting-edge safety, modularity, and efficiency. Based in Austin, TX, we’re rapidly growing as we work to deploy the world’s first fleet of advanced microreactors. Join us and help revolutionize energy for a sustainable future.

We are seeking a skilled CFD Analyst / Thermal-Fluid Engineer to perform high-fidelity thermal-fluid simulations supporting nuclear and energy-related applications. This role focuses on applying advanced CFD tools to complex heat transfer and fluid flow problems, often in support of reactor components, experiments, or coupled multi-physics analyses.

• →Develop and execute CFD models for thermal-fluid analysis.
• →Perform simulations involving conjugate heat transfer, turbulence modeling, and single- or multi-phase flows.
• →Apply sound numerical methods to ensure solution accuracy, stability, and convergence.
• →Conduct mesh generation, sensitivity studies, and model validation against experimental or analytical data.
• →Collaborate with system analysts, designers, and experimental teams to support integrated thermal-hydraulic evaluations.
• →Document modeling assumptions, methods, and results in clear technical reports.
• →Experience with nuclear facilities or other safety-critical infrastructure
• →Familiarity with nuclear energy regulatory environment
• →Understanding of radiation and thermal effects on materials and long-term degradation mechanisms
• →Knowledge of probabilistic risk assessment methodologies

• MSc in Nuclear Engineering, Mechanical Engineering, or a related field.
• 5+ years of hands-on CFD experience applied to thermal-fluid problems.
• Demonstrated expertise with one or more CFD platforms (STAR-CCM+, COMSOL, Altair, Nek5000, or OpenFOAM).
• Strong background in numerical methods for fluid flow and heat transfer.
• Ability to independently plan and execute complex CFD analyses.

• Experience with nuclear-related CFD applications (e.g., reactor components, experimental test sections).
• Knowledge of coupling CFD with system codes or structural/thermal solvers.
• Experience working in regulated or high-quality engineering environment.

• Based in the United States
• Willing to work on-site in Idaho Falls, Idaho.

Aalo Atomics provides a collaborative and supportive work environment, opportunities for professional growth, intellectually challenging careers, and competitive compensation. Aalo Atomics is an equal opportunity employer and considers all employment decisions without regard to race, color, religion, national or ethnic origin, sex, sexual orientation, gender identity or expression, age, disability, veteran status, or any other characteristic protected by law.