The Neil Ashton Podcast

Why leave NVIDIA to join Mistral?
In this episode, Neil Ashton explains his move to Mistral as VP of Computational Engineering, where he will work alongside Johannes Brandstetter on AI for engineering, physics foundation models and large language models.
Neil reflects on the career decisions that took him from Manchester and Formula 1 to Oxford, NASA collaborations, AWS and NVIDIA. He shares what he learned from moving between academia and industry, how open datasets became central to his work, and why the chance to keep learning and build something new made Mistral an exciting next step.
For students, researchers and engineers considering a change, the episode also offers a personal perspective on developing a specialism, keeping an academic mindset in industry, and staying open to opportunities without needing to plan your entire career in advance.
Topics include:
Getting a first break in Formula 1
Switching between academia and industry
Learning HPC, cloud computing and product engineering
Machine learning, open datasets and scientific collaboration
NVIDIA's hardware, software and partnership ecosystem
Why Mistral, and working with Johannes Brandstetter
Career advice: expertise, continual learning and embracing change
Podcast archive: https://neilashton.co.uk/podcasts/
Chapters:
00:00 Podcast intro
00:39 From NVIDIA to Mistral
01:46 My new role: physics AI and LLMs
03:18 Starting out in engineering and motorsport
06:26 A PhD and finding a specialism
08:38 Getting a first break in Formula 1
09:52 Returning to academia
11:57 Oxford, HPC and NASA
15:21 Consulting, Formula 1 and the connection to AWS
19:39 Leaving Oxford and joining AWS
21:06 Product engineering, ML and open datasets
23:29 What I learned at NVIDIA
26:39 Why Mistral felt like the next step
29:51 Career advice: stay open to change
31:28 Becoming known for a specialism
32:41 Podcast plans and closing thoughts
Paper mentioned:
Fluid Intelligence: A Forward Look on AI Foundation Models in Computational Fluid Dynamics
Neil Ashton, Johannes Brandstetter and Siddhartha Mishra
https://arxiv.org/abs/2511.20455
These are personal reflections on my own career and experience.

Should you still study engineering when AI can already write code, analyse data and automate parts of an engineer's job?

In this solo episode, Neil Ashton gives his view on engineering education and careers in the age of AI. His answer is yes—but the skill set is changing. Neil explains why engineering fundamentals still matter, where AI can act as an enabler, what students and early-career engineers should learn now, and why soft skills, projects and internships may become even more important.

Topics include:

- Why demand for engineers is likely to remain strong
- The engineering tasks most likely to change
- AI as an enabler for coding, CAD, CAE and automation
- Why domain knowledge is still essential for checking AI's work
- What practical AI fluency means beyond using a chat interface
- Advice for undergraduate, postgraduate and PhD students
- How projects, internships and soft skills can help you stand out

Podcast archive: https://neilashton.co.uk/podcasts/

Chapters:

00:00 Podcast intro
00:39 The career question in the age of AI
03:20 Why engineering demand is still growing
04:43 Which engineering tasks AI will change
05:21 AI as an engineering enabler
09:18 Why fundamentals and domain expertise still matter
11:59 AI fluency and the hiring market
16:41 Advice for students and researchers
20:05 What engineers should study now
22:11 Standing out: soft skills, projects and internships
25:41 Is engineering still worth it?

Resource mentioned:

- World Economic Forum, Future of Jobs Report 2025 — Skills outlook: https://www.weforum.org/publications/the-future-of-jobs-report-2025/in-full/3-skills-outlook/

Please note that this episode expresses my personal opinion and does not represent the views of NVIDIA.

Hydrogen combustion, high-fidelity CFD and the future of aircraft propulsion are the focus of this conversation with Dr. Daniel Mira, Head of the Propulsion Technologies Group at the Barcelona Supercomputing Center. Neil and Dani discuss why reacting flows are so difficult to simulate, how hydrogen changes combustion and aircraft design, the limits of RANS, LES and DNS, GPU-native solvers, coding agents and AI surrogate models.

Full episode, corrected transcript and resources:
https://neilashton.co.uk/podcasts/s4-e6-daniel-mira-on-hydrogen-combustion-modelling-and-future-propulsion/

Topics

Why reacting flows are so computationally difficult
Hydrogen versus hydrocarbon combustion
When hydrogen could reach commercial aviation
How engines and aircraft must be redesigned
Industrial trust in high-fidelity combustion CFD
RANS, LES and DNS for reacting flows
Chemistry, load balancing and computational cost
Wall modelling in combustion LES
GPU acceleration and solver redesign
Coding agents for scientific software
AI surrogate models and digital engineering workflows

Selected resources

Daniel Mira and the Propulsion Technologies Group
https://ptg.bsc.es/?p=44

Propulsion Technologies Group — research lines
https://ptg.bsc.es/research-lines/

BSC — Combustion research
https://www.bsc.es/research-development/research-areas/engineering-simulations/combustion

Center of Excellence in Combustion (CoEC)
https://coec-project.eu/

High-fidelity simulations of the mixing and combustion of a technically premixed hydrogen flame
https://upcommons.upc.edu/entities/publication/08a27c10-cb13-4357-a3ab-8e9ec1d706cc

Chapters

00:00 Podcast intro
00:39 Introducing Daniel Mira
03:00 Conversation begins
04:55 Why combustion CFD is so hard
10:23 Daniel’s path into hydrogen and jet-engine combustion
12:48 Hydrogen versus hydrocarbon combustion
17:58 Industrial adoption of hydrogen
20:54 Gas turbines, aviation and fuel infrastructure
25:35 How jet engines must change
30:43 Redesigning the whole aircraft
34:46 What will trigger commercial adoption?
37:27 Why aerospace projects take a decade
42:14 RANS, LES and DNS for reacting flows
44:31 Replacing expensive tests with high-fidelity CFD
46:01 The biggest accuracy gaps in combustion LES
49:26 Where the computational cost goes
52:06 Chemistry, species and source-term bottlenecks
55:35 Wall modelling in combustion LES
59:49 GPUs, algorithms and solver redesign
01:08:52 Can coding agents accelerate combustion CFD?
01:12:27 AI surrogate models for combustion
01:24:20 Closing thoughts

Differentiable physics, neural emulators and foundation models for PDEs are the focus of this conversation with Professor Nils Thuerey, head of the Physics-based Simulation group at TUM. Neil and Nils discuss PhiFlow, PICT, Tadpole, scalable 3D transformers, online synthetic data, open datasets, world models and agents that call physics simulators.

Full episode, corrected transcript and resources:
https://neilashton.co.uk/podcasts/s4-e5-prof-nils-thuerey-on-differentiable-physics-and-foundation-models/

Topics

Differentiable physics and physics-based deep learning
PhiFlow and differentiable simulation across ML frameworks
When neural emulators can outperform their training data
Foundation models for PDEs and synthetic online training
Scalable 3D transformers and high-resolution simulations
LES, temporal data and correlated CFD datasets
Open-source tools, startups and physics-aware world models
AI agents that call physics simulators

Papers

Neural Emulator Superiority: When Machine Learning for PDEs Surpasses its Training Data
https://arxiv.org/abs/2510.23111

Tadpole: Autoencoders as Foundation Models for 3D PDEs with Online Learning
https://arxiv.org/abs/2605.15284

P3D: Scalable Neural Surrogates for High-Resolution 3D Physics Simulations with Global Context
https://arxiv.org/abs/2509.10186

PICT — A Differentiable, GPU-Accelerated Multi-Block PISO Solver for Simulation-Coupled Learning Tasks in Fluid Dynamics
https://arxiv.org/abs/2505.16992

PhiFlow: Differentiable Simulations for PyTorch, TensorFlow and JAX
https://proceedings.mlr.press/v235/holl24a.html

Physics-based Deep Learning
https://arxiv.org/abs/2109.05237

Learning to Control PDEs with Differentiable Physics
https://arxiv.org/abs/2001.07457

Solver-in-the-Loop: Learning from Differentiable Physics to Interact with Iterative PDE-Solvers
https://arxiv.org/abs/2007.00016

tempoGAN: A Temporally Coherent, Volumetric GAN for Super-resolution Fluid Flow
https://arxiv.org/abs/1801.09710

Deep Learning Methods for Reynolds-Averaged Navier-Stokes Simulations of Airfoil Flows
https://arxiv.org/abs/1810.08217

WeatherBench: A Benchmark Dataset for Data-Driven Weather Forecasting
https://arxiv.org/abs/2002.00469

SuperWing: A Comprehensive Transonic Wing Dataset for Data-Driven Aerodynamic Design
https://arxiv.org/abs/2512.14397

Links

Nils Thuerey and the Physics-based Simulation group
https://ge.in.tum.de/about/n-thuerey/

Chapters

00:00 Podcast intro
00:39 Introducing Prof. Nils Thuerey
04:13 Conversation begins
05:13 From Computational Numerics to Graphics and Visual Effects
07:17 Physics-Based Deep Learning Before ChatGPT
10:01 CNNs, Graphics and the Move into Engineering Applications
12:37 PhiFlow and Differentiable Physics
14:13 Can Neural Emulators Surpass Their Training Data?
18:00 The Promise and Limits of Foundation Models for PDEs
20:43 Tadpole and Synthetic Online Pre-Training
24:07 From Canonical PDEs to Navier-Stokes and Industrial CFD
26:35 What Do Foundation Models Actually Learn?
28:36 PDE Pre-Training vs. Millions of CFD Simulations
33:08 Scaling 3D Transformers and Training Infrastructure
35:58 Generating and Training on Data in Real Time
38:00 LES, Temporal Data and Turbulence
42:15 Overfitting and Correlated Simulation Data
44:27 Bringing Differentiable Solvers Back into the Loop
45:31 WeatherBench, APEBench and the Value of Benchmarks
47:09 SuperWing, Open Datasets and Commercial Data
51:31 Open Source, Commercial Models and a Technical Oscar
56:17 Academia, Startups and Industry
01:00:55 What Will Change Over the Next Five Years?
01:02:07 World Models and the Need for Physics
01:08:19 Agents, Tool Use and Calling Physics Simulators
01:11:22 Career Advice for AI and Simulation
01:13:54 Closing Thoughts

RANS uncertainty, data-driven turbulence modeling and AI for Science are the focus of this conversation with Professor Paola Cinnella, Professor of Fluid Mechanics at Sorbonne University and Director of SCAI. Neil and Paola discuss high-order methods, dense gases, Bayesian uncertainty, AirfRANS, surrogate modeling, scientific publishing and education in the AI era.

Full episode, corrected transcript and resources:
https://neilashton.co.uk/podcasts/s4-e4-prof-paola-cinnella-on-ai-for-science-and-fluid-mechanics/

Topics

Fluid mechanics, CFD and high-order schemes
Dense gases, real-gas effects and expansion shockwaves
Uncertainty quantification and Bayesian methods
RANS turbulence-model uncertainty
AirfRANS and CFD datasets for machine learning
Turbulence modeling vs. surrogate modeling
Scientific publishing and ML-for-CFD standards
SCAI and AI for Science
Education, ChatGPT and centaur scientists

Papers

Quantification of model uncertainty in RANS simulations: A review — Heng Xiao, Paola Cinnella
https://doi.org/10.1016/j.paerosci.2018.10.001

Discovery of Algebraic Reynolds-Stress Models Using Sparse Symbolic Regression — Martin Schmelzer, Richard P. Dwight, Paola Cinnella
https://doi.org/10.1007/s10494-019-00089-x

Bayesian estimates of parameter variability in the k-epsilon turbulence model — W.N. Edeling, P. Cinnella, R.P. Dwight, H. Bijl
https://doi.org/10.1016/j.jcp.2013.10.027

AirfRANS: High Fidelity Computational Fluid Dynamics Dataset for Approximating Reynolds-Averaged Navier-Stokes Solutions
https://arxiv.org/abs/2212.07564

Data-driven turbulence modeling — Paola Cinnella
https://arxiv.org/abs/2404.09074

Direct numerical simulations of supersonic turbulent channel flows of dense gases — Luca Sciacovelli, Paola Cinnella, Xavier Gloerfelt
https://doi.org/10.1017/jfm.2017.237

Links

Paola Cinnella named Director of SCAI
https://scai.sorbonne-universite.fr/news/paola-cinnella-new-director

SCAI
https://scai.sorbonne-universite.fr/

Paola Cinnella — HAL publications
https://cv.hal.science/paola-cinnella

Paola Cinnella — Google Scholar
https://scholar.google.com/citations?hl=fr&user=wBRA0JAAAAAJ

ERCOFTAC SIG 54 — Machine Learning for Fluid Dynamics
https://www.ercoftac.org/special_interest_groups/54-machine-learning-for-fluid-dynamics/master-of-science-internships/

Chapters

00:00 Podcast intro
00:39 Introducing Prof. Paola Cinnella
03:28 Conversation begins
03:56 How Paola Found Fluid Mechanics
07:09 Moving from Italy to France
08:37 High-Order Schemes and Compressible Flows
09:30 Building an Academic Career
12:06 Dense Gases and Uncertainty Quantification
15:16 Expansion Shockwaves and Real-Gas Effects
19:17 Returning to Paris and Academic Mobility
24:52 Academia, Passion and Persistence
27:51 Bayesian Methods and Turbulence Uncertainty
30:47 Learning Statistics Across Disciplines
33:07 LearnFluidS, AirfRANS and CFD Datasets
36:33 Skepticism and Physics in ML Turbulence Modeling
40:41 Could ML Lead to a Universal Turbulence Model?
42:59 Turbulence Models, Surrogate Models and RANS
45:03 Why LES Alone Cannot Solve Optimization
47:15 Multi-Fidelity Modeling
49:08 What Computers & Fluids Looks for in ML-for-CFD Papers
54:05 CFD Metrics vs. Machine-Learning Metrics
57:13 Overselling, Publication Pressure and Quality
01:02:22 SCAI and AI for Science
01:06:07 Cross-Disciplinary AI for Science
01:09:26 Education in the AI Era
01:12:44 Critical Thinking and AI Outputs
01:18:15 AI as a Companion, Not a Replacement
01:21:42 AlphaFold and the Future of Discovery
01:23:43 Training Centaur Scientists
01:25:11 Closing Thoughts