CFD Multiphase & DEM Engineer

Location: London, United Kingdom; hybrid work with 2–3 days per week in the central office, plus global customer travel of up to 2–3 weeks per quarter.

Company

hirify.global is a physics AI company building simulation software for industrial engineering and manufacturing across aerospace and defence, automotive, semiconductors, materials, and energy and renewables.

What you will do

• Build complex multiphysics models from geometry cleanup and meshing through simulation, post-processing, and experimental-data validation across single-phase, multiphase, and coupled CFD-DEM regimes.
• Develop and validate DEM models for granular and particle-laden systems, including fluidised beds, pneumatic conveying, mills, aerosols, suspensions, and coating processes.
• Build parametric CAD models and automate simulation pipelines for design optimisation and design-of-experiments studies across large parameter spaces.
• Partner directly with customers, often on-site, to solve engineering challenges, present results, and recommend actionable next steps while balancing accuracy and efficiency.
• Generate simulation datasets for machine-learning and deep-learning surrogate models, applying smart sampling to reduce computational cost.
• Use Flux and on-premise HPC resources, improve simulation practices for physics-informed ML, lead projects, and mentor junior colleagues.

Requirements

• Expertise in fluid mechanics, heat transfer, and multiphase modelling, including particle-laden flows, fluidised beds, and coupled CFD-DEM.
• Experience with multiphase CFD approaches including VOF, Euler–Euler, Euler–Lagrange, or mixture models.
• Experience with DEM modelling using EDEM, Rocky, LIGGGHTS, or an equivalent tool, and with coupled CFD-DEM workflows for particle–fluid systems.
• Experience with heat and mass transfer modelling.
• Proficiency in at least one of Star-CCM+, OpenFOAM, or Fluent.
• MEng, MSc, or PhD in mechanical, chemical, or process engineering.
• Python scripting, simulation automation, DoE, surrogate modelling, and design-space exploration.
• Strong written and verbal communication with technical and non-technical audiences.

Nice to have

• Experience with reacting flows and phase-change processes.
• Parametric CAD modelling with NX or CATIA.
• Ability to quickly learn new programming languages.

Culture & Benefits

• Hybrid work combining time in the Shoreditch office with work-from-home days.
• Collaborative, high-caliber team of engineers, scientists, and operators with a flat structure.
• Equity options, a 10% employer pension contribution, private medical insurance, and enhanced parental leave.
• 25 days of annual leave plus public holidays, free office lunches, and personal-development support.
• Wellhub subscription, Employee Assistance Programme, eye tests, nursery scheme, Bike2Work scheme, season-ticket loan, and EV salary sacrifice.