Senior CFD Engineer - Multiphase

ABOUT US PhysicsX is a deep-tech company with roots in numerical physics and Formula One, dedicated to accelerating hardware innovation at the speed of software. We are building an AI-driven simulation software stack for engineering and manufacturing across advanced industries. By enabling high-fidelity, multi-physics simulation through AI inference across the entire engineering lifecycle, PhysicsX unlocks new levels of optimization and automation in design, manufacturing, and operations — empowering engineers to push the boundaries of possibility. Our customers include leading innovators in Aerospace & Defense, Materials, Energy, Semiconductors, and Automotive. WHO WE’RE LOOKING FOR As a Senior CFD Engineer (Delivery), you are a problem solver and a builder, who is passionate about creating practical solutions that enable customers to make better engineering decisions. You are someone who can grasp and apply advanced engineering concepts across multiple industries, and you excel at working directly with customers (often directly on-site) to build CAE models that are integrated into AI-tools that are both useful and used.  We're building our Singapore presence from the ground up. This is a rare opportunity to join at the founding stage of a regional team, with the autonomy to help define what this team becomes. You bring deep expertise in fluid mechanics, heat transfer, and multiphase modelling, with a solid ability to apply fundamental knowledge to real-world phenomena across a wide range of engineering applications. Highly proficient in at least one of Star-CCM+, OpenFOAM, or Fluent and adept at automating these tools to create scalable optimisation workflows that drive impactful results. Experience in parametric CAD modelling (NX or CATIA) and coding in Python/Java, (or the ability to quickly learn programming languages), is an advantage. With 3-5 years of industry experience (post Masters or PhD) in a commercial, non-research environment, you’re ready to hit the ground running. You’re confident setting up CFD simulations independently, interpreting complex results with depth, and making informed decisions based on solid engineering judgement. THIS ROLE In this role, you’ll work closely with our Data Scientists, Machine Learning Engineers, and customers to understand and define the engineering challenges we are solving. You’ll play a crucial role in delivering high-fidelity simulations by: * Independently building complex multi-physics models from geometry clean-up and meshing, to simulating and post-processing complex real-world phenomena, integrating experimental data for model validation. * Building robust parametric CAD models (NX or CATIA) coupled with simulation pipeline automation, for executing advanced design optimization and DoE studies. * Partner with customers to address their most complex engineering challenges through advanced CAE & AI solutions; present results clearly, recommend actionable next steps, and balance accuracy with efficiency under tight deadlines. * Working at the intersection of CAE and Data Science to generate high-quality simulation datasets for training Machine/Deep Learning models. Leveraging data sampling techniques to efficiently capture the design space, reduce computational cost, and enhance model accuracy. * Accelerate high-fidelity modelling by using Flux (our cloud platform) and on-premise HPC resources, going beyond smart meshing and model setup to achieve real performance gains. * Continuously improving engineering best practices, adapting CFD model setups and outputs to support the development of Deep Learning surrogates. * Combining project leadership with a strong commitment to mentoring junior colleagues, contributing to a culture of collaboration, growth, and shared success. * Traveling globally (North America, Europe, Asia, Oceania) up to 2–3 weeks per quarter to work side-by-side with customers in building solutions on-site. As the role evolves, there are exciting opportunities for growth as an Individual Contributor (IC) or a Team Lead (TL), especially if you’re driven to take ownership of more complex projects and lead the direction of future solutions.   We value diversity and are committed to equal employment opportunity regardless of sex, race, religion, ethnicity, nationality, disability, age, sexual orientation or gender identity. We strongly encourage individuals from groups traditionally underrepresented in tech to apply. To help make a change, we sponsor bright women from disadvantaged backgrounds through their university degrees in science and mathematics.    We collect diversity and inclusion data solely for the purpose of monitoring the effectiveness of our equal opportunities policies and ensuring compliance with UK employment and equality legislation. This information is confidential, used only in aggregate form, and will not influence the outcome of your application.

Orbital is an AI-first industrial company building hardware from the atoms up. Our goal is to lead an industrial renaissance to advance critical technologies and secure our planet for generations to come. We’re starting with critical hardware for AI data centers to make them more performant and sustainable. Every Orbital product is invented with our AI platform — uniting AI-automated hardware engineering with AI-designed material science to achieve breakthrough real-world performance. We have an ambitious mission and need excellent people in all our teams - AI research, operations, advanced materials, mechanical engineering, chemical engineering and manufacturing. Working at Orbital means working in tightly integrated, vertically integrated teams. We’re looking for people who have a love of physical technology, curiosity in AI and a desire to learn. ROLE OVERVIEW Orbital is seeking a highly skilled and innovative Senior Mechanical Engineer to design and optimize advanced Modular Data Centers. This is a Senior role within the MDC function that combines strategic input and involves hands-on participation in cutting-edge research, including design and layout of mechanical systems for data center equipment and actively participating in and conducting lab experiments to verify the validity and performance of our modular data centers. KEY RESPONSIBILITIES A lead role within Orbital for Modular Data Center design, manufacturing and deployment. As a subject matter expert, you’ll interface with existing and potential clients configuring modular deployments to best suit their needs and suggest improvements. Design for Modular Data Centers * Selection of coils, heat exchangers, chillers, compressors, pumps and other supporting components * Working with key stakeholders to recommend designs for performance, manufacturability, and ease of deployment * Compare the impact on overall efficiency of the data center of different refrigerants for the ambient design condition * Select compressors, expansion valves, and other supporting systems Coordination, Review and Approval of Technical Reports and Documentation * Review internal engineering work as well as external contractors such as CFD and FEA analysis * As the team continues to grow, this role will be responsible for the direction of intermediate engineers, drafters and designers from various disciplines that will be added to the MDC team. Miscellaneous * Participate in the evaluation and selection of potential contract manufacturers * Assist in supporting internal and external manufacturing operations including integrating feedback from various stakeholders to continuously improve our modular products * Lead role in bringing new and innovative ways to design and manufacture products WHAT WE’RE LOOKING FOR * Professional engineering designation with 7+ years of experience in the design, selection, and/or manufacturing of mechanical and electrical systems for data centers, HVAC, and large-scale cooling applications * Deep understanding of modular data center architecture — including mechanical/electrical subsystems, applicable codes, data center tiers, and best practices for efficiency and reliability * Expertise in chiller and refrigeration system selection, design and optimization * Experience with simulation tools (e.g. CFD, FEA) for thermal and fluid dynamics, and hands-on lab experience designing and executing experiments to validate mechanical system performance * Ability to interpret experimental data and translate findings into actionable design improvements WHY JOIN ORBITAL? * Competitive salary and equity package - the ability to own part of Orbital as we grow * Flexible and generous paid time off * Excellent health, dental and vision insurance plan * Regular company off-sites to the USA and beyond * The experience of working in a cutting-edge organisation dedicated to a better future Orbital is an equal opportunity employer. We celebrate diversity and are committed to creating an inclusive environment for all employees.