[Nyx Earth] Propulsion CFD Engineer Verified today

About the Role

You will lead computational fluid dynamics analysis of Nyx propulsion systems, delivering flow physics insight that drives component design, thruster performance, and vehicle-level integration.

CFD Analysis and Component Simulation

• Perform CFD simulations of propulsion components such as valves, regulators, orifices, injectors, and feed lines to characterize internal flow, pressure drop, and flow-induced loads.
• Support design trade studies by predicting component-level performance across the operating envelope in steady-state and transient conditions.
• Identify and help resolve flow anomalies such as cavitation, choking, or flow separation that affect component performance.

Plume Characterization and Thruster Performance

• Model thruster plume characterization from near-field continuum expansion through far-field rarefied flow, including relevant gas dynamics effects.
• Assess plume-induced thermal, contamination, and force/torque effects on adjacent subsystems and vehicle surfaces.
• Support thruster and nozzle design by predicting performance parameters such as thrust coefficient and specific impulse from CFD.

Cross-Functional Collaboration

• Work closely with propulsion design engineers and structural and thermal analysts to translate CFD results into actionable design inputs and margins.
• Communicate CFD findings and their implications clearly to multidisciplinary teams and program stakeholders.
• Support system-level trades on component sizing, thruster placement, and plume shielding for vehicle interfaces.

Model Validation, Tools and Documentation

• Validate and correlate CFD models against test data from cold-flow testing, hot-fire testing, and plume diagnostics to build and maintain model confidence.
• Maintain and improve CFD simulation workflows, meshing practices, and tools to improve turnaround time and consistency across the design office.
• Produce clear technical reports and analysis documentation supporting design reviews and certification.

What We Are Looking For

• M.S. or Ph.D. in aerospace or a related field, with 3 or more years of hands-on CFD experience relevant to propulsion or fluid dynamics.
• Proficiency with CFD software such as ANSYS Fluent, STAR-CCM+, OpenFOAM, or equivalent.
• Experience modeling compressible, multiphase, and/or rarefied gas flows relevant to propulsion valves and thruster plumes.
• Familiarity with plume characterization methods such as DSMC or continuum-rarefied coupling is a strong plus.
• Strong grounding in fluid mechanics, thermodynamics, and gas dynamics fundamentals.
• Experience correlating CFD predictions against test data.
• Familiarity with scripting or automation using Python or MATLAB for meshing, post-processing, or workflow automation.
• Fluent in English. German and French are an asset.

Skills and Behaviors

• A hands-on approach to problem-solving, combined with a collaborative mindset to work across multidisciplinary teams.
• Excellent organizational skills and ability to multitask.
• Capability of working autonomously whilst collaborating productively with remote teams.
• Positive and flexible attitude in a constantly evolving environment.
• Ability to communicate effectively with a wide variety of audiences.

Location

You will perform your duties principally at our premises in Bordeaux and may be required to travel from time to time to our premises in Munich.