Senior Thermal CFD Engineer – Nuclear Microreactor Systems

Radiant; El Segundo (CA); On-site; USD 140,000 - 225,000; Full time

Benefits offered by this job

Stock options

Comprehensive medical benefits

One Medical memberships

Vision and dental coverage

Paid parental leave

Flexible PTO

Team events

HQ near Pacific Ocean

Job summary

Radiant in El Segundo, CA is seeking a Senior Thermal Modeling Engineer to design, develop, and implement CFD and thermal FEA simulations for the Kaleidos microreactor. You will ensure high fidelity, reliability, and safety across reactor systems, cooling, and shielding, with opportunities to advance analysis methods in an interdisciplinary setting.

The role emphasizes ownership of thermal analyses, development of automated workflows, and collaboration with engineering teams to drive milestones

Qualifications

• Bachelor’s degree in engineering, physics, or similar field from an accredited institution.
• 5+ years of relevant industry experience.
• 5+ years experience with STAR-CCM+, Ansys Fluent, or other commercial CFD code.
• Proficiency with CAD software (Siemens NX).
• Mastery of finite element and computational fluid dynamics modeling principles and methods.
• Experience communicating and distilling information with cross-functional teams.

Responsibilities

• Own and execute thermal CFD analysis to evaluate design and performance of Kaleidos reactor systems.
• Develop and implement solutions to model turbulent flow, heat transfer, and multi-physics interactions.
• Identify and implement CFD simulation best practices.
• Build automated workflows to expand simulation capabilities, accuracy, and efficiencies.
• Collaborate across teams and disciplines to support design of reduced order analysis methods.

Skills

STAR-CCM+

Ansys Fluent

CFD modeling

Finite element analysis

Heat transfer

Cross-functional comms

Education

Bachelor's degree in engineering or physics

Tools

Siemens NX

Job description

Radiant in El Segundo, CA is seeking a Senior Thermal Modeling Engineer to design, develop, and implement CFD and thermal FEA simulations for the Kaleidos microreactor. You will ensure high fidelity, reliability, and safety across reactor systems, cooling, and shielding, with opportunities to advance analysis methods in an interdisciplinary setting.

The role emphasizes ownership of thermal analyses, development of automated workflows, and collaboration with engineering teams to drive milestones