Thermal comfort, air quality and energy performance of buildings through CFD simulation and the modelling of indoor environments.
Whether you are designing a new building, looking to correct discomfort on an existing site or to validate an HVAC installation, we can help. EOLIOS sets out to answer every question raised by the thermal-airflow phenomena found in buildings: occupant comfort, air quality, stratification and condensation.
Our services rely on CFD simulation and indoor-environment modelling to quickly visualise flow velocity, temperature, humidity and air diffusion in any zone. Our studies analyse comfort, energy and air-quality issues in order to propose the best solutions.
Large volumes, air mixing and heat sources: a uniform indoor climate.
View this expertise →Open-plan offices, lobbies and public buildings: air diffusion, draughts and discomfort zones.
View this expertise →Control of humidity, condensation and comfort around the pools.
View this expertise →Thermal stratification and destratification of warehouses and large volumes.
View this expertise →Solar gains, greenhouse effect and stack effect of glazed spaces.
View this expertise →Controlled humidity and temperature for preventive conservation.
View this expertise →Comfort of spectators and athletes in large arenas.
View this expertise →Year-round temperature evolution and the building's energy demand.
View this expertise →Click a step to expand it: what we analyse, and what we deliver.
Every study follows a rigorous protocol, calibrated on real measurement campaigns and a hundred or so simulated sites.
Drawings, thermal loads, HVAC systems and measurement campaign.
3D geometry, mesh refined around critical zones.
Nominal, ramp-up and critical failures.
Server-side solving: transient and steady-state regimes.
Fields, bottlenecks and quantified recommendations.
A selection of the CFD studies carried out for project owners, architects and engineering offices.
Swimming poolAquatic centre — Hauts-de-Seine
LogisticsMedical supplies warehouse
ResortSharaan by Jean Nouvel
AuditoriumThermal comfort — Auditorium
AtriumClimate comfort — Glass atrium
SportMicroclimate — AccorHotels Arena
MuseumProtection of artworks
ColdCold room — Leipzig
DTSDynamic Thermal Simulation
In-depth articles and videos from our CFD software.

Wind and buoyancy to ventilate without consuming energy.
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The stack effect: density, gravity and air set in motion.
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Plume dispersion and control of the health risk (ICPE 2921).
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Simulation and modelling: excellent alternatives to physical testing.
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Technical papers, methods and fundamentals of HVAC engineering.
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Hot/cold aisles, chilled water, CRAC/CRAH and free cooling.
Learn more →Fast, accurate simulations from the most powerful CFD software.
At EOLIOS Ingénierie, we specialise in CFD simulation applied to HVAC engineering and the modelling of indoor environments. Based in France, with offices in London, Milan, Munich, Madrid, Warsaw, Casablanca and the USA, our firm supports project owners, architects and engineering offices in mastering thermal comfort, air quality and the energy performance of buildings.
CFD simulation makes it possible to visualise and analyse airflow, the distribution of temperature and humidity, stratification and discomfort zones with precision: occupant comfort, air diffusion, condensation, smoke control and natural ventilation. Coupled with dynamic thermal simulation, it assesses energy demand and optimises HVAC systems at both the design and renovation stages.
From swimming pools to large volumes, from museums to sports venues, every study is carried out by our doctor-engineers with a clear, actionable deliverable — to guarantee the comfort, energy efficiency and air quality of your buildings, in France and internationally.
Thermal-airflow comfort studies rely on the expertise of a team of doctor-engineers in fluid mechanics, recognised in their discipline. Specialists in CFD simulation and indoor-environment modelling, our engineers support project owners, architects and engineering offices at every stage of a project: design, regulatory validation, optimisation or renovation.
Originally founded in France, EOLIOS Ingénierie is today a benchmark consultancy in building thermal and airflow simulation, in Europe and worldwide. Present in Paris, London, Milan, Munich, Madrid, Warsaw, Casablanca and the United States, we work on all kinds of buildings — combining sharp scientific expertise, high-performance computing tools and a fine understanding of HVAC engineering.
Recognised scientific expertise, a lead doctor per discipline.
Pools, museums, lobbies, offices, warehouses: all kinds of environments.
Local support for your international projects.
The simplest thing is to talk it through together. Our engineers reply with an initial technical read.