← All roles

CFD Multiphase & DEM Engineer

PhysicsX· Delivery
Apply on company site
Hybrid (London)Full-timePosted 6mo ago

About the role

PhysicsX is hiring a CFD Multiphase & DEM Engineer to build and automate high-fidelity multiphysics simulations, develop DEM models, and work with customers to solve complex engineering problems using CFD-DEM and AI-enabled workflows. The role is based in London with a hybrid office schedule and global travel.

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. Present results clearly, recommend actionable next steps, and balance accuracy with efficiency under real project deadlines.
  • Work at the intersection of CAE and data science to generate high-quality simulation datasets for training machine learning and deep learning surrogate models. Apply smart sampling strategies to capture the design space efficiently and reduce computational cost.
  • 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 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.

Qualifications

  • MEng, MSc, or PhD in mechanical, chemical, or process engineering
  • Python scripting and simulation automation
  • DoE, surrogate modelling, and design space exploration
  • Parametric CAD modelling (NX or CATIA advantageous)
  • Strong written and verbal communication with technical and non-technical audiences
  • Deep expertise in fluid mechanics, heat transfer, and multiphase modelling including particle-laden flows, fluidised beds, and coupled CFD-DEM
  • Proficiency in Star-CCM+, OpenFOAM, or Fluent
  • Experience with DEM codes such as EDEM, LIGGGHTS, or Rocky
  • On-site customer engagement experience is valuable (travel required)

Skills

Required:Multiphase CFDDEM modellingCoupled CFD–DEM workflowsHeat and mass transfer modellingCFD software proficiencyPython scripting and automationDoE / surrogate modellingCommunication
Nice to have:Reacting flows / phase-changeParametric CAD modelling

Benefits

  • Equity options
  • 10% employer pension contribution
  • Free office lunches
  • Enhanced parental leave (3 months paternity, 6 months maternity)
  • 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 and Season ticket loan
  • Octopus EV salary sacrifice
Last updated Sep 23, 2026. Interested? Apply on the company site.

About PhysicsX

Accelerating Industrial Innovation with AI

PhysicsX is deploying AI to transform how physical systems are engineered, embedding intelligence across the entire product lifecycle, from concepting and design to manufacturing and operations.

AIIndustrial InnovationDesignManufacturingOperationsAI ToolsProduct Lifecycle
Company profileWebsite

More open roles at PhysicsX