Senior Thermofluids Analyst at Rocket Lab USA

Senior Thermofluids Analyst Rocket Lab's integrated analysis team contributes to the operation and development of Neutron & Electron by using modelling and simulation to solve challenging problems involving dynamics, fluid flow, and thermodynamics. As a Thermofluids Analyst II in Rocket Lab's Thermofluids Analysis team you will contribute to the analysis, design validation, and improvements of Rocket Lab's launch vehicles. Day‑to‑Day Responsibilities Day to day, you will be expected to conduct concept development, perform trade studies, run simulations, and evaluate performance around Neutron's pressurisation, propellant management, and reaction control systems. You will be responsible for evaluating system sizing, propellant depletion, slosh, propellant loading & conditioning, and CONOPS across all flight phases (Ascent, Descent, On‑Orbit). Key Responsibilities Perform, validate, and document CFD analyses of launch vehicle fluid systems (compressible/incompressible flow, two‑phase, aerodynamics, choked flow) Conduct heat transfer simulations including integrated thermal analyses (ITAs), component thermal analyses, aeroheating thermal response, and TPS specification Perform thermofluid analyses of launch vehicle systems including model development, numerical analysis, material selection, and performance optimization studies Collaborate with design and test engineers to iterate design concepts, determine test requirements, and demonstrate positive margins Process and interpret ground test and flight data to verify MPE bounds, detect anomalies, resolve sensor issues, and determine root causes using physical principles Conduct peer reviews, document methodologies, and produce test levels (Acceptance, Proto‑qualification, Qualification) using approved margining approaches Support subsystem testing through test‑analysis correlation, pre/post‑test reports, and standardization of analysis procedures per industry best practice Develop propellant dynamics models (temperature, gas rejection, control strategies) and contribute to automation of test and flight data review processes Qualifications A degree in Mechanical, Aerospace Engineering or similar field 5+ years industry experience, ideally from the Aerospace, Automotive or Marine industries Strong understanding of physical principles (heat transfer, electronics, internal flow, aerodynamics, etc.) Fluid engineering experience around pressure loss, valves and sensors Demonstrated experience with one or more industry standard CFD packages: Fluent, CFX, STAR‑CCM+ Experience in Python and associated scientific packages: numpy, pandas, scipy, matplotlib Demonstrated thermal modelling of components, networks and lump masses Experience with experimental test methods, sensor selection and data post‑processing/ interpretation (thermocouples, pressure transducers, accelerometers, strain gauges, microphones etc.) The ability to work to deadlines within a high‑pressure environment Proven communication skills and the ability to build strong working relationships with colleagues and engineering professionals Nice to Have Experience with dynamic thermofluid systems: Propellant Dynamics (slosh, flow instabilities, Pogo) Propellant level sensing and control strategies Pumps, pressurisation systems and cryogenics experience Thermodynamics of 2‑phase, cryogenics or refrigeration systems Compressible gas modelling of pressure vessels, pressurisation systems and piping Knowledge around space thermal environments and modelling for both orbital and ascent environments Thermal protection system design, specification and implementation Knowledge of HVAC system design and/or analysis Experience with one or more industry standard thermal modelling packages: Thermal Desktop, THERMICA, NX SST Familiarity using Solidworks CAD and PDM packages (or comparable industry standard packages) with emphasis on model interrogation and defeaturing for subsequent analyses Experience in Python package development and modelling (git, CI, deployment) Familiarity with industry standards (e.g., MIL‑STD‑1540, GSFC‑STD‑7000, ECSS‑E‑HB‑32, NASA‑STD‑5001) Important Information For candidates seeking to work in US offices only: To conform to U.S. Government space technology export regulations, including the International Traffic in Arms Regulations (ITAR), Rocket Lab Employees must be a U.S. citizen, lawful U.S. permanent resident (i.e., current Green Card holder), or lawfully admitted into the U.S. as a refugee or granted asylum, or be eligible to obtain the required authorizations from the U.S. Department of State and/or the U.S. Department of Commerce, as applicable. Rocket Lab provides equal employment opportunities to all employees and applicants for employment and prohibits discrimination and harassment of any type without regard to race, color, religion, age, sex, national origin, disability status, genetics, protected veteran status, sexual orientation, gender identity or expression or any other characteristic protected by federal, state, or local laws. Applicants requiring a reasonable accommodation for the application/interview process for a job in the United States should contact Giulia Johnson at [email protected]. This dedicated resource is intended solely to assist job seekers with disabilities whose disability prevents them from being able to apply/interview. For candidates seeking to work in New Zealand offices only: For security reasons, background checks will be undertaken prior to any employment offers being made to an applicant. These checks will include nationality checks as it is a requirement of this position that you be eligible to access equipment and data regulated by the United States' International Traffic in Arms Regulations. Under these Regulations, you may be ineligible for this role if you do not hold citizenship of Australia, Japan, New Zealand, Switzerland, the European Union, or a country that is part of NATO, or if you hold ineligible dual citizenship or nationality. #J-18808-Ljbffr