High-Fidelity CFD
Physics-led simulation across the full spectrum—from incompressible internal flows to complex compressible, thermal and reacting flow problems.
RANS / LES / DNSMultiphaseCHT / FSIReacting flows
What we do
From complex physics to clear engineering decisions.
We combine scientific depth with practical implementation—helping engineering teams understand performance, reduce uncertainty and improve products before committing to hardware.
OpenFOAM Training
Your applications. Your workflows. Your OpenFOAM training. Courses are built around company-specific geometries, boundary conditions and development goals.
On-site or remoteOwn applicationsBeginner to expertSolver development
HPC & Software Stacks
Scale CFD without scaling complexity. We reduce turnaround time and manual overhead through cluster integration, parallel execution and reproducible environments.
MPISchedulersContainersAutomation
Simulation Architecture
System architecture and workflow design for efficient simulation processes—from geometry and meshing to orchestration, monitoring and post-processing.
Workflow designCI / CDData pipelinesDigital twins
Simulation capabilities
Flow physics, made visible.
Selected work across turbulence, thermal systems, multiphysics and industrial flow applications—presented in one consistent visual system.
Internal and external flows across a broad range of operating conditions.
Fidelity matched to dominant flow structures, accuracy requirements and compute budget.
Coupled fluid–solid temperature fields, thermal loads and conjugate heat transfer.
Interacting physical effects for flows that cannot be represented by a single-domain model.
Finite-rate chemistry and non-equilibrium models for demanding flow applications.
Parallel workflows built for robust execution from workstation to HPC cluster.
Who we work with
Built for teams with demanding simulation questions.
Support can start with a single model, strengthen an existing CFD group or establish a complete internal simulation capability.
Engineering departments
Reliable simulation evidence for product and design decisions.
Research & development
Advanced numerical methods for questions beyond standard workflows.
CFD teams
Specialist support for modelling, automation and solver development.
Growing capabilities
Architecture, training and infrastructure for building CFD in-house.
How we work
A direct path from question to improvement.
No black-box simulations. Every project is structured around the decision you need to make and the evidence required to make it confidently.
Define
Frame the engineering question, success criteria and necessary fidelity.
Model
Create a robust numerical setup and verify the relevant physics.
Understand
Translate flow-field data into mechanisms and actionable insight.
Improve
Evaluate design changes and deliver a reproducible workflow.
About hexatransition GmbH
Dr.-Ing. Gabriel Axtmann
CEO & Founder
Gabriel Axtmann combines research in numerical fluid mechanics with practical expertise in OpenFOAM, fluid–structure interaction, scientific Python and CFD-related HPC. Based in Stuttgart, hexatransition GmbH treats simulation, software and compute infrastructure as one engineering system—so results remain understandable, scalable and reproducible.
Physics firstFidelity follows the engineering question.
Open workflowsTransparent methods instead of black boxes.
Built to transferKnowledge and workflows stay usable in your team.
Start a project
Tell us about your simulation challenge.
A short description is enough to start. We will clarify the physics, required fidelity and the most efficient path forward.