# Fluid Dynamics Engineer at Fuse Fluid Dynamics Engineer at Fuse in San Leandro, California. Full-time, paying $110k–$160k. Posted August 19, 2026. - Company: Fuse - Location: San Leandro, California - Job type: Full-time - Pay: $110k–$160k - Experience: 2+ years - Posted: 2026-08-19 - Apply: https://jobs.ashbyhq.com/fuse/4a396786-d4c4-4898-b4b8-1f58e7eee9a4/application - Source: https://jobmagic.ai/jobs/fluid-dynamics-engineer-fuse-1jv14e ## Requirements - B.Sc.or M.Sc. in Mechanical Engineering, Chemical Engineering, or Applied Physics with a strong fluid-mechanics concentration. - Demonstrated experience with commercial or open-source CFD tools such as ANSYS Fluent, ANSYS CFX, OpenFOAM, or COMSOL Multiphysics. - 2+ years designing or operating large-scale industrial fluid systems including pumps, filters, heat exchangers, and piping networks in energy, nuclear, defense, or high-voltage environments. - Familiarity with transformer oil or similar dielectric insulating fluids, including properties, degradation mechanisms, filtration, and electrical testing. - Strong command of convective and forced-flow heat transfer for system-level thermal management. ## Description ### **About Fuse** We are building one of the most potentially consequential companies of the century. Our mission is to accelerate the world's transition to fusion energy while safeguarding humankind. This is not a normal company. This is not a normal job. We are committed for the long term to win. ### **About the Role** Fuse is designing and constructing Z-Star, a next-generation pulsed-power accelerator requiring the management, recirculation, filtration, and conditioning of multi-million-liter volumes of high-voltage transformer oil and deionized (DI) water. As the Fluid Dynamics Engineer, you'll lead the design, simulation, and operational integration of these large-scale fluid systems from concept through commissioning. ### **Core Responsibilities** - System Design: Design and develop large-scale fluid circuits for storing, transporting, recirculating, and reconditioning millions of liters of transformer dielectric oil and deionized water, including pump selection, piping layout, filtration trains, heat exchangers, and storage-tank configuration. - CFD Simulation: Build and run high-fidelity Computational Fluid Dynamics models of oil and DI-water flow paths to optimize circulation rates, identify cavitation or turbulence risks, and ensure dielectric integrity under operational conditions. - Dielectric Fluid Management: Develop and maintain fluid-quality protocols including oil breakdown-voltage testing, moisture-content control, and particle filtration, consistent with high-voltage pulsed-power standards. - DI Water Conditioning: Design and oversee the mixed-resin-bed ion-exchange system to maintain DI-water resistivity, dissolved-gas content, and temperature within operational limits. - Thermal Analysis: Perform thermohydraulic analyses to quantify heat loads from repeated pulsed discharges and design cooling strategies that maintain fluid properties within required dielectric specifications. - P&ID and Documentation: Develop Piping and Instrumentation Diagrams (P&IDs), system schematics, bills of materials, and operational procedures for all fluid subsystems. - Commissioning and Troubleshooting: Support fabrication, testing, and commissioning of fluid systems on-site; diagnose and resolve operational anomalies during early shot campaigns. - Interdisciplinary Collaboration: Work closely with pulsed-power, high-voltage, structural, and vacuum engineering teams to ensure fluid-system integration with electrode geometry, transmission lines, and chamber design. ### **Minimum Qualifications** - B.Sc.or M.Sc. in Mechanical Engineering, Chemical Engineering, or Applied Physics with a strong fluid-mechanics concentration. - Demonstrated experience with commercial or open-source CFD tools such as ANSYS Fluent, ANSYS CFX, OpenFOAM, or COMSOL Multiphysics. - 2+ years designing or operating large-scale industrial fluid systems including pumps, filters, heat exchangers, and piping networks in energy, nuclear, defense, or high-voltage environments. - Familiarity with transformer oil or similar dielectric insulating fluids, including properties, degradation mechanisms, filtration, and electrical testing. - Strong command of convective and forced-flow heat transfer for system-level thermal management. ### **Preferred Qualifications** - Experience with deionized-water systems, ion-exchange resin beds, degassing, and resistivity monitoring in high-voltage or pulsed-power environments. - Knowledge of pulsed power, particle accelerators, fusion energy, or high-energy-density physics facilities. - Knowledge of ASME piping codes, industrial safety standards, and high-voltage facility regulations. - Proficiency in Python for post-processing simulation data and automating fluid-quality reporting. ### **What We Value** - Give a shit. Build things you're proud of. - Take responsibility. If something is broken and you can fix it, fix it. See things through. - Move fast. Make decisions, learn quickly, and keep moving forward. - Think bigger. Simplify relentlessly. Don't default to the safe answer. - Disagree and commit. The best idea wins. Once a decision is made, we move. - Desire to win. This is hard. Expect intensity. We are here to win. - Plan B is to make Plan A work. ### **Additional Requirements** This is not a remote position and will require relocation if not already local to the applicable Fuse facility. ### **Benefits** - Medical, dental, and vision coverage. - Relocation assistance for roles that require it. - Flexible time off. Take what you need, no accrual tracking. - 2 weeks of paid time off built into the end of each year, subject to team and business needs. - Supportive leave of absence policies. - Paid leave for new parents. ### ### **ITAR Requirements** To conform to U.S. Government technology export regulations, including the International Traffic in Arms Regulations (ITAR), you must be a U.S. citizen, lawful permanent resident of the U.S., protected individual as defined by 8 U.S.C. 1324b(a)(3), or eligible to obtain the required authorizations from the U.S. Department of State. ### **Equal Opportunity** Fuse is an Equal Opportunity Employer; employment with Fuse is governed on the basis of merit, competence, and qualifications and will not be influenced by race, color, religion, gender, national origin/ethnicity, veteran status, disability status, age, ancestry, immigration status, sexual orientation, gender identity, marital status, mental or physical disability, or any other legally protected status.