Senior AI / Simulation Engineer - Fire and Explosion

The UL Solutions Research and Development team and Modeling and Simulation team is seeking a Simulation Engineer with a strong CFD, fire dynamics and thermal sciences background to support fire and explosion hazard modeling. This role applies advanced computational fluid dynamics, heat transfer, and combustion modeling to evaluate battery fires, gas explosions, and performance-based fire safety designs.The engineer will primarily work with Flame Acceleration Simulator (FLACS) for deflagration explosion and gas dispersion analysis and Fire Dynamics Simulator (FDS), fire dynamics, smoke, and thermal impact modeling. The position supports large-scale battery fire testing, performance-based design (PBD), code compliance, and customer-facing engineering projects within the energy and built-environment sectors.This role is intended for engineers trained in thermal-fluid sciences or CFD, who wish to specialize in fire and explosion safety engineering.A global leader in applied safety science, UL Solutions (NYSE: ULS) transforms safety, security and sustainability challenges into opportunities for customers in more than 110 countries. UL Solutions delivers testing, inspection and certification services, together with software products and advisory offerings, that support our customers’ product innovation and business growth. The UL Mark serves as a recognized symbol of trust in our customers’ products and reflects an unwavering commitment to advancing our safety mission. We help our customers innovate, launch new products and services, navigate global markets and complex supply chains, and grow sustainably and responsibly into the future. Our science is your advantage.Bachelor’s or Master’s degree in Mechanical Engineering / Chemical Engineering/ Thermal Sciences/ Combustion, Fire Protection Engineering, or CFD-related disciplines3–5 years of experience in CFD, thermal-fluid simulation, fire modeling, or related applied simulation workHands-on experience or project exposure to: Fire Dynamics Simulator (FDS) andFLACS or similar explosion / gas dispersion toolsComputer Aided Design (CAD) software (e.g. Inventor, SolidWorks)Ability to apply engineering judgment and first principles when building simulation modelsExcellent technical writing and verbal communication skillsComfortable working independently on defined tasks within a structured engineering frameworkExposure to battery energy storage systems (BESS/ESS) or lithium-ion thermal runaway (nice to have)Familiarity with large-scale fire testing or fire test data interpretation (nice to have)Awareness of performance-based fire engineering concepts (nice to have)Basic knowledge of relevant standards (e.g., NFPA 855, NFPA 68/69, IFC, international fire codes) (nice to have)Experience with other CFD tools (ANSYS Fluent, OpenFOAM, CFX)Experience with Python workflow automation (nice to have)Interest in research, model validation, and advanced simulation methodologiesWhat you’ll experience working for ULS UL Solutions has been pioneering change since 1894 and we’re still leading the way. From day one, we’ve blazed a trail protecting the planet and everyone on it. Our teams have influenced billions of products, plus services, software offerings and more. We break things, burn things and blow things up. All in the name of safety science. That’s where you come in — because none of it could happen without you. It takes passion to protect people, problem-solving to safeguard personal data and conviction to make the world a more sustainable place. It takes bold ideas and brilliant minds to build a better world for future generations across the globe. This is more than a job. It’s a calling. A passion to use our expertise and play our part in creating a more secure, sustainable world today — and tomorrow. As a member of our safety science community, you’ll use your ideas, your energy and your ambition to innovate, challenge and ultimately, help create a safer world. Everyone here is unique. But we’re also a global community, working together to help create a safer world. Join UL Solutions and you can connect with the brightest minds in the business, all bringing their distinct perspectives and diverse backgrounds together to deliver real change. Empowering our customers to keep the world safe means thinking ahead. It means investing in training and empowering our people to learn and innovate. At UL Solutions, we help build a better future — one where everyone benefits. Join UL Solutions to be at the center of safety. To learn more about us and the work we do, visit UL.comTotal Rewards: We understand compensation is an important factor as you consider the next step in your career. The estimated salary range for this position is $100,000 to $130,000 USD and is based on multiple factors, including job-related knowledge/skills, experience, geographical location, as well as other factors. This position is eligible for annual bonus compensation with a target payout of 10% of the base salary. This position also provides health benefits such as medical, dental and vision; wellness benefits such as mental and financial health; and retirement savings (401K) commensurate with the standard rewards offered in each individual location or country. We also provide full-time employees with paid time off including vacation (15 days), holiday and personal days (totaling 12 days) and sick time off (72 hours).#LI-SG2#LI-Hybrid Develop and execute CFD-based fire and explosion simulations using: FLACS for gas dispersion, flame acceleration, and vented/unvented deflagration analysisFDS for gas dispersion, fire dynamics, smoke movement, heat transfer, and plume behaviorModel ESS/BESS fire and explosion scenarios, including: Battery off-gas release and dispersionIgnition and overpressure developmentLarge-scale enclosure and outdoor fire scenariosApply strong fundamentals in heat transfer (convection, conduction, radiation), fluid flow and turbulence, combustion, and fire dynamicsAnalyze simulation outputs such as: Temperature fields, heat fluxes, and thermal exposureOverpressure and impulseGas concentration and visibilitySupport performance-based fire and explosion safety design (PBD) aligned with applicable codes and standardsInterpret simulation results in the context of code intent, safety objectives, and risk reduction strategiesAssist in defining credible worst-case and design fire/explosion scenariosPerform pre-processing, solver execution, and post-processing of CFD simulationsSupport verification and validation (V&V) through comparison with: Large-scale ESS fire test dataLiterature and experimental benchmarksPrepare clear, defensible technical reports for internal review and external customersWork under guidance of senior fire and explosion engineers while progressively taking ownership of tasksCollaborate with multidisciplinary teams across CFD, testing, certification, and researchMaintain high-quality documentation and adherence to established modeling workflowsActively develop expertise by reviewing technical literature and internal best practicesPosting Date: 2026-07-13