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About the Role

PhysicsX is building an AI-driven simulation software stack for engineering and hardware innovation. We empower engineers to push boundaries by enabling high-fidelity, multi-physics simulation through AI inference across the entire engineering lifecycle.

Responsibilities

• Independently build complex multi-physics models, from geometry clean-up and meshing through to simulation, post-processing, and integration of experimental data for validation, spanning single-phase, multiphase, and coupled CFD-DEM regimes.
• Develop and validate DEM models of granular and particle-laden systems, including fluidised beds, pneumatic conveying, mills, aerosols, suspensions and coating processes, applying appropriate contact models, size distributions, and coupling strategies.
• Build robust parametric CAD models coupled with simulation pipeline automation to execute advanced design optimisation and DoE studies across large parameter spaces.
• Partner with customers to address complex engineering challenges through advanced simulation and AI solutions, presenting results clearly and recommending actionable next steps.
• Work at the intersection of CAE and data science to generate high-quality simulation datasets for training machine learning and deep learning surrogate models.
• Leverage Flux (our cloud platform) and on-premise HPC resources to accelerate high-fidelity modelling, going beyond standard setup practices to achieve genuine performance gains at scale.
• Continuously improve engineering best practices, adapting simulation model setups and outputs to support the development of deep learning surrogates and physics-informed ML models.
• Combine project leadership with a commitment to mentoring junior colleagues, contributing to a culture of collaboration, rigour, and shared growth.
• Travel globally (North America, Europe, Asia, Oceania) up to 2–3 weeks per quarter to work on-site with customers building solutions together.

Requirements

• Deep expertise in fluid mechanics, heat transfer, and multiphase modelling, including particle-laden flows, fluidised beds, and coupled CFD-DEM.
• Highly proficient in at least one of Star-CCM+, OpenFOAM, or Fluent.
• Experienced with DEM codes such as EDEM, LIGGGHTS, or Rocky.
• Adept at automating tools to create scalable optimisation workflows.
• Experience in parametric CAD modelling (NX or CATIA) is an advantage.
• Coding in Python (or the ability to pick up new programming languages quickly) is an advantage.
• Strong written and verbal communication with technical and non-technical audiences.

Skills

• Multiphase CFD: VOF, Euler–Euler, Euler–Lagrange, or mixture models
• DEM modelling: EDEM, Rocky, LIGGGHTS, or equivalent
• Coupled CFD–DEM workflows for particle–fluid systems
• Heat and mass transfer modelling
• Reacting flows and phase-change processes (advantageous)
• Star-CCM+, OpenFOAM, or Fluent proficiency
• Python scripting and simulation automation
• DoE, surrogate modelling, and design space exploration
• Parametric CAD modelling (NX or CATIA advantageous)

Location

• London

Work Type

• Hybrid
• Onsite

Experience Level

• 3–5 years of industry experience (post-MEng, MSc, or PhD) in a commercial, non-research environment

Education Level

• MEng, MSc, or PhD in mechanical, chemical, or process engineering

Benefits

• Equity options
• 10% employer pension contribution
• Free office lunches
• Enhanced parental leave (3 months full pay paternity and 6 months full pay maternity leave)
• YellowNest nursery scheme
• 25 days of Annual Leave (+ Public Holidays)
• Private medical insurance (100% employee cover)
• Wellhub Subscription
• Eye tests
• Personal development support
• Employee Assistance Programme (EAP)
• Bike2Work scheme
• Season ticket loan
• Octopus EV salary sacrifice

About the Company

• 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.
• Our customers include leading innovators in Aerospace & Defense, Materials, Energy, Semiconductors, and Automotive.

Equal Opportunity

• 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.