Wind engineering improves infrastructure safety by identifying where wind forces, turbulence, and pressure loads create risks — before construction begins. It helps engineers and developers design structures that perform safely under real-world wind conditions, reducing the chance of structural failure, pedestrian hazards, and costly design revisions later in the project. Below, we answer the most common questions about what wind engineering does, when you need it, and how it works in practice.
How does wind engineering improve infrastructure safety?
Wind engineering improves infrastructure safety by analysing how wind interacts with buildings, bridges, and public spaces, then using those findings to inform structural and urban design decisions. Without this analysis, wind risks are often discovered too late — during construction or after a building is occupied — when changes are far more expensive.
At the structural level, wind engineering quantifies the forces acting on facades, roofs, and load-bearing elements. This allows structural engineers to design connections, cladding systems, and support structures that can handle peak wind loads without failure. For tall buildings in particular, wind-induced pressure differences across a facade can be significant, and getting these figures wrong has real consequences.
At street level, wind engineering identifies locations where downwash from tall buildings creates dangerous conditions for pedestrians. Areas near tower corners, building passages, and open plazas are especially vulnerable. According to the NEN 8100 standard used in the Netherlands, wind speeds exceeding 15 m/s at eye level — with an exceedance probability above 0.30% — are classified as genuinely dangerous and unacceptable. Identifying these zones early gives designers the room to adjust building geometry, add setbacks, or introduce windbreaks before the design is locked in.
The practical rule of thumb: a building that is more than twice the height of its immediate surroundings is significantly more likely to cause wind problems at ground level. Knowing this at the design stage, rather than after a permit is granted, changes what you can realistically do about it.
What types of infrastructure benefit most from wind engineering?
High-rise buildings, bridges, large public spaces, and transport infrastructure benefit most from wind engineering. These are structures where wind loads are large, wind-induced comfort problems are predictable, and the cost of getting it wrong — structurally or in terms of usability — is high.
Tall residential and commercial towers are the most obvious candidates. As building height increases, so do wind speeds and the complexity of airflow around the structure. Neighbouring buildings, street layouts, and nearby open water all influence how wind behaves at ground level and on the facade.
Bridges are another clear case. Long-span bridges are sensitive to dynamic wind effects — the Tacoma Narrows Bridge collapse in 1940 remains the most cited example of what happens when aerodynamic behaviour is underestimated. Modern bridge design routinely includes wind engineering assessments for this reason.
Beyond these, the following types of infrastructure regularly benefit from wind studies:
- Masterplan and area developments — where the combined effect of multiple new buildings on pedestrian comfort needs to be assessed
- Airports and transport hubs — where real-time wind data and localised wind maps support operational safety and passenger comfort
- Sports venues and stadiums — where roof structures and open stands create complex wind environments
- Tunnels, canopies, and covered walkways — where channelling effects can accelerate wind unexpectedly
- Urban plazas and public squares — where more than 25% open facade on the windward side significantly increases the risk of wind nuisance
How can wind engineering reduce construction costs?
Wind engineering reduces construction costs by catching wind-related design problems early, when changes are still cheap. A wind study carried out during the design phase costs a fraction of what structural modifications or facade redesigns cost once construction has started — or worse, once a building is occupied and complaints begin.
Consider what happens without a wind assessment. A high-rise tower is designed with a broad facade perpendicular to the prevailing wind direction. The building gets built. Pedestrians on the ground floor experience dangerous downdraft conditions. Fixing this after the fact might mean adding a canopy, a windscreen, or extensive planting — all of which are more expensive to retrofit than to design in from the start, and none of which are as effective as adjusting the building geometry early on.
Wind engineering also helps avoid over-engineering. When wind loads on facades and structures are calculated accurately, engineers do not need to apply conservative safety margins that drive up material costs. A wind engineering assessment gives you the actual numbers, not a worst-case guess.
The principle is straightforward: the earlier wind is considered in the design process, the more options you have and the less each option costs. Urban design decisions — street orientation, building clustering, height ratios between adjacent structures — are far easier to adjust at the masterplan stage than at the detailed design stage.
When is a wind engineering study legally required for infrastructure?
A wind engineering study is legally required when a permit authority specifies it as a condition of the planning application, or when a project falls within the scope of standards that mandate wind assessment. In the Netherlands, NEN 8100 is the applicable standard for pedestrian wind comfort; in the UK and internationally, the Lawson criteria are commonly used.
In practice, municipalities increasingly require a wind study for:
- High-rise buildings above a certain height threshold (this varies by municipality)
- Large-scale area developments or masterplans where multiple new buildings are introduced
- Projects near sensitive locations such as schools, hospitals, or busy public spaces
- Buildings in exposed locations — near open water, on elevated ground, or at the edge of existing urban fabric
Beyond legal requirements, many developers and architects commission wind studies voluntarily. A wind assessment carried out before submission strengthens the permit application and reduces the risk of objections or conditions being imposed mid-process. It also gives the design team actionable data to work with, rather than waiting for a regulator to flag a problem.
If you are unsure whether your project requires a formal wind study, the safest approach is to ask early. A preliminary desk study or expert opinion can clarify what is needed before you commit to a full assessment. You can find an overview of available assessment types at actiflow.com.
What’s the difference between wind comfort and wind load assessments?
Wind comfort assessments evaluate how wind conditions affect people at street level — whether a space is safe and comfortable to walk through, sit in, or use. Wind load assessments calculate the forces that wind exerts on a building’s structure and facade — the data structural engineers need to design safe, code-compliant buildings. These are two distinct studies that answer different questions.
A wind comfort assessment typically measures the exceedance probability of wind speeds at pedestrian height (1.75 m). Under NEN 8100, this produces a classification from A (comfortable for all activities) to E (unacceptable for any activity). The output tells you whether a plaza, entrance, or outdoor seating area is suitable for its intended use, and what design changes could improve conditions.
A wind load assessment focuses on the structural implications of wind. It calculates pressure and suction forces on facades, roofs, and structural elements, typically in line with Eurocode EN 1991-1-4. These figures feed directly into structural calculations and are often required for cladding contractors, facade engineers, and building permit applications.
The two assessments use similar underlying data — wind speed, direction, and the geometry of the building and its surroundings — but they serve different purposes and produce different outputs. On complex projects, both are needed. A tower might pass its structural wind load calculations with no issues while still generating dangerous downdraft conditions at the base that make the entrance unusable in winter.
How does CFD simulation work in wind engineering for infrastructure?
CFD (Computational Fluid Dynamics) simulation works by building a detailed 3D model of a building or urban area, dividing the surrounding air volume into millions of small cells, and solving the equations of fluid motion across those cells to calculate wind speed, pressure, and turbulence at every point. The result is a complete picture of how wind behaves around a structure under defined conditions.
The process follows three main steps:
- 3D model construction — The building and its surroundings are modelled using geodata sources such as 3DBAG, AHN, and local city models. Existing and permitted buildings are included. Details smaller than one metre are typically omitted because they have negligible effect on the results. A buffer zone of at least 250 metres surrounds the core area to ensure wind enters the model correctly.
- Mesh generation — The air volume is divided into computational cells. Cell sizes vary from around 0.25 m near building surfaces to several metres at the outer boundary. For large urban studies, meshes can exceed 500 million cells. Finer cells near walls capture the velocity gradient in the atmospheric boundary layer accurately.
- Simulation and post-processing — The solver calculates flow for each wind direction, typically using a steady-state approach. Results are then processed into colour-coded maps showing wind speed, pressure, or comfort classification across the area. These maps are directly usable in design reviews, client presentations, and permit applications.
CFD is particularly well suited to large-scale infrastructure and urban assessments where physical wind tunnel testing is not practical. For CFD simulations at city scale, the computational demands are substantial — a city-wide study can require thousands of CPU cores and terabytes of RAM for post-processing. For individual buildings or smaller masterplans, wind tunnel testing remains a reliable alternative, especially where facade pressure data is needed for structural calculations.
How Actiflow helps with wind engineering for infrastructure
We are a specialist fluid dynamics consultancy with over 21 years of experience in wind engineering for buildings, area developments, and infrastructure. Our team works with real estate developers, architects, structural engineers, and municipalities across the Netherlands, Belgium, the UK, Gibraltar, and beyond.
Here is what we bring to your project:
- Full range of assessment types — from a quick expert opinion in the early design phase to a full CFD assessment or wind tunnel test for permit applications, covering both NEN 8100 (Netherlands) and Lawson criteria (international projects)
- Large-scale urban experience — including city-wide wind studies such as the comprehensive assessment we carried out for the city of Rotterdam, covering an area with a mesh of over 583 million cells
- Clear, visual output — colour-coded maps and graphics that you can share directly with clients, planners, and permit authorities without needing to translate the technical findings
- Speed and flexibility — for regular clients, we set everything aside to start the next day if needed; our internal process automation keeps turnaround times short without compromising quality
- Regulatory knowledge — we know the specific requirements of municipalities and permit authorities, and we advise you on which study is needed for which situation, so you do not commission more than necessary
- A single point of contact — from intake to final report, one engineer stays close to your project and keeps you informed throughout
Curious how we can help with wind engineering for your infrastructure project? Contact us — we are happy to discuss your project and help you find the right engineering solution. You can also learn more about our team and background on our about us page.
