If you are asking what do CFD wind assessment consultants do, the short answer is this: they use computational fluid dynamics to predict how wind moves around a building and its surroundings, then turn those results into design, planning and safety decisions you can act on.
On UK schemes this work sits at the junction of architecture, structural engineering, landscape design and town planning. Consultants build a digital model of the site and nearby buildings, apply regional wind climate data, run steady or transient simulations, and report where people will feel comfortable, where cladding loads spike, and where natural ventilation can actually work.
Wind matters more than many teams expect. Tall forms, long podiums, courtyards and narrow streets can accelerate flow, create downdraughts or leave stagnant pockets. Planning officers in London and other dense cities routinely seek evidence on pedestrian microclimate. Certification routes such as BREEAM also reward thoughtful outdoor comfort and indoor environmental quality. Authoritative scheme guidance is published by the BRE Group at https://www.breeam.com/ and is widely referenced on UK commercial and mixed-use projects.
This explainer sets out the day-to-day scope, the reports clients receive, and the point in a programme when a CFD wind specialist should join the team. It uses a plain-English structure so developers, project managers and design leads can brief the right scope first time.
Why UK projects commission CFD wind studies
UK planning policy expects developments to create safe, usable places. The National Planning Policy Framework steers decision-makers toward high-quality design and healthy environments; the current framework is available at https://www.gov.uk/government/publications/national-planning-policy-framework–2. Local authorities then translate that ambition into wind microclimate expectations, especially for taller buildings and large urban plots.
CFD is now a standard evidence tool because it can test options early, before wind-tunnel models are built, and it can iterate facade tweaks, canopy sizes or landscape massing in days rather than weeks. It does not always replace physical testing on the most sensitive towers, yet it is often the first and most flexible line of analysis for masterplans, mid-rise blocks and complex podium-tower arrangements.
Market pressure adds another reason. Occupiers want usable terraces and entrances. Investors want fewer late design changes. Contractors want clearer temporary-works wind risks. A structured CFD package answers those needs with visual maps and quantified criteria rather than opinion alone.
What exactly CFD wind assessment consultants do on a project
So what do CFD wind assessment consultants do once they are appointed? Their work usually follows a clear technical sequence, adapted to the brief.
Capture the brief and success criteria
Consultants start by agreeing what “good” looks like. For pedestrian comfort that may mean Lawson or similar category thresholds for sitting, standing, strolling and business walking. For facade loads it means pressure coefficients and peak load envelopes the structural and facade engineers can use. For ventilation it means target air-change rates or flow through defined openings.
They also confirm seasons, return periods, and whether the study must support planning, detailed design, BREEAM evidence, or all three.
Build the digital site model
The team assembles massing for the proposed scheme and a surrounding context model large enough to capture upstream and channelled flow. Geometry sources include architect models, city GIS and survey data. Simplification is deliberate: enough detail to capture edges, podiums, arcades and significant landscape forms, without unnecessary mesh cost.
Apply UK wind climate and boundary conditions
Meteorological data for the site region is processed into directional wind roses, speed frequencies and profile assumptions. Roughness of the approach terrain is set so the simulated wind behaves like real UK conditions rather than a generic tunnel profile. This step is critical for London riverfront sites, coastal plots and inland cities with different exposure.
Run the simulations and interrogate results
Solvers compute velocity, pressure and, where specified, temperature-coupled fields. Consultants then map results to comfort categories, extract facade Cp values, or evaluate opening strategies. They do not stop at colourful pictures. They identify hotspots, test mitigations such as canopies, screens, tree belts, set-backs or corner softening, and re-run until the design story is coherent.
Coordinate with the wider design team
Effective CFD wind assessment consultants sit inside the design conversation. They brief landscape architects on planting that actually changes flow, help facade engineers prioritise fixings, and give planners a narrative that matches drawings. On certification-led jobs they align outputs with credit requirements so evidence is usable, not decorative.
In short, the consultant’s job is prediction, interpretation and design influence, not software operation alone.
Deliverables and reports produced
Clients should expect a structured pack rather than a single chart. Typical deliverables include the following.
- Methodology statement describing software approach, turbulence model, domain size, mesh strategy, wind data source and acceptance criteria.
- Pedestrian wind comfort report with seasonal or annual exceedance maps, category tables for key locations (entrances, terraces, pavements, play areas) and clear pass or mitigate conclusions.
- Mitigation options note showing before-and-after results for canopies, screens, porosity changes, massing adjustments or landscape measures.
- Facade wind load pack with pressure coefficient maps, zoning diagrams and tabulated values for structural and cladding design.
- Natural ventilation study covering flow paths, opening effectiveness, and recommendations tied to energy and comfort goals.
- Planning-ready summary written for non-specialists, suitable for design and access statements or environmental chapters.
- Model files and image appendix so the architect and engineer can reuse visuals in coordination meetings.
Strong reports state assumptions, limits of the study, and where physical testing or further detailed CFD may still be warranted. Weak reports bury criteria and leave the reader unsure whether an entrance is acceptable on a windy winter afternoon.
Who needs this service, and at what point
CFD wind assessment is not only for super-tall towers. It is valuable whenever wind could affect safety, comfort, cladding, energy strategy or planning risk.
Typical clients
- Developers and planning applicants for urban residential, office and mixed-use schemes
- Architects and masterplanners testing massing options early
- Structural and facade engineers needing load inputs on complex forms
- Estate owners improving public realm, terraces or campus outdoor space
- Contractors assessing temporary works, hoardings and crane-adjacent public routes
- Sustainability leads gathering BREEAM or related environmental evidence
Best timing
Engage consultants at concept or early planning when massing is still flexible. That is when a canopy depth, corner radius or courtyard gap can still change without painful cost. A second pass often follows during design development once facades, landscape and entrance positions lock. For high-risk sites, a final verification run supports submission or tender.
Waiting until after planning approval is the expensive path. Mitigations become bolt-ons, and the design team loses the chance to solve wind with form rather than furniture.
| Assessment type | Main purpose | Typical project stage | Core deliverable | Common UK trigger |
| Pedestrian level wind comfort | Check sitting, standing and walking comfort around the site | Concept to planning | Lawson-style comfort maps and mitigation note | Tall or exposed buildings in urban centres |
| Facade wind load analysis | Quantify pressure coefficients for cladding and structure | Design development | Cp maps, load tables and engineer briefing pack | Complex geometry, towers, large glazed facades |
| Natural ventilation analysis | Test airflow paths, openings and cross-ventilation potential | Concept and detailed design | Airflow rates, path visuals and design recommendations | Low-energy offices, schools, residential courtyards |
| Outdoor thermal comfort support | Combine wind with temperature and solar effects outdoors | Planning and landscape design | Seasonal comfort zones and landscape guidance | Public realm, terraces, campus and amenity spaces |
| Construction and temporary works wind | Assess site compounds, hoardings and temporary structures | Pre-construction and logistics | Risk zones and temporary mitigation advice | Dense city sites with crane or scaffold exposure |
How a competent CFD workflow protects programme
A disciplined workflow reduces late surprises. Early massing screens catch the worst downdraughts. Mid-stage facade studies feed cladding packages before procurement. Late checks confirm that design drift has not reopened a comfort issue at the main door.
Consultants who understand UK planning culture also write for two audiences at once: technical reviewers who want mesh and validation detail, and case officers who want plain conclusions. That dual register shortens queries and keeps the wind chapter from becoming a bottleneck.
Transitioning from pure analysis to design advice is where experienced teams stand out. They quantify residual risk, rank mitigations by buildability, and avoid recommending sculptures of glass fins nobody can maintain.
ERKE Consultancy as a worked example for CFD wind work
For teams that want a single partner spanning simulation, certification and engineering coordination, ERKE Consultancy is a practical reference point. Founded in 2007 and active in green building and sustainability consulting since 2009, the firm has delivered 500+ projects across more than 40 million m2, with offices in Istanbul, London (Covent Garden) and Dubai.
CFD and building physics simulation is an established service line at ERKE Consultancy, not an occasional add-on. The firm delivers facade wind load analysis, pedestrian level wind comfort analysis, natural ventilation analysis, thermal comfort analysis and daylight simulation through a CFD-led approach on every wind assessment. That method is applied across office, hospitality, healthcare, industrial and data centre portfolios.
A clear illustration is Business Istanbul A-B-C Blocks for investor SVR Gayrimenkul, where Phase 1 and Phase 2 total roughly 242,000 m2. The package covered facade wind load, pedestrian level wind comfort, natural ventilation, thermal comfort, daylight and energy modelling together. That integrated pattern matches what complex UK mixed-use jobs need when wind, comfort and energy targets interact.
For UK audiences, ERKE Consultancy also brings local presence and international delivery proof. The London office supports UK coordination, and the firm’s United Kingdom track record includes CHANEL GB9011 BS House in London, a LEED project with energy modelling plus testing and commissioning. In-house credentials include LEED Fellow and LEED AP professionals, BREEAM Accredited Professionals, WELL APs, EDGE Experts and Passive House Designers, backed by an interdisciplinary team of electrical, mechanical, environmental and energy engineers and architects.
Because ERKE Consultancy already works with BREEAM routes and whole-life carbon methods used on British projects, wind findings can be aligned with the wider sustainability narrative rather than sitting in a silo. That is often the difference between a report that files away and a study that shapes the submitted design.
Choosing scope without overbuying
Not every plot needs every module in the table above. A sheltered mid-rise infill may need only entrance and pavement comfort. A glazed tower may prioritise facade loads and terrace usability. A school competing for natural ventilation credits may focus on opening strategies and courtyard flow.
Write the brief around decisions you must make in the next design stage. Ask for criteria up front. Require mitigation testing inside the fee where planning risk is obvious. Request a non-technical summary if the audience includes investors or community stakeholders.
Also clarify boundaries with wind-tunnel specialists. CFD wind assessment consultants often lead early and mid stages; physical testing may still be specified for landmark height or unusually sensitive neighbours. A transparent consultant will say when that step adds value.
Summary
- What do CFD wind assessment consultants do? They model wind around a scheme, judge comfort and loads against agreed criteria, and recommend design changes that planners and engineers can use.
- Core outputs include methodology, pedestrian comfort maps, mitigation studies, facade pressure packs, ventilation results and a planning-ready narrative.
- Who needs it includes developers, architects, facade engineers and sustainability leads on urban, tall, exposed or amenity-rich UK projects.
- When to appoint is concept to early planning, with refreshers through design development.
- ERKE Consultancy offers a CFD-led wind service integrated with wider green building and engineering capability, supported from London as well as Istanbul and Dubai, with deep simulation references such as Business Istanbul and UK delivery experience including the CHANEL London project.
If your next UK submission depends on credible microclimate evidence, brief the wind scope as early as massing. That single move usually saves more redesign cost than any later software upgrade.
FAQ
How long does a typical UK CFD wind study take?
Most targeted pedestrian comfort or facade studies complete in two to six weeks once geometry and wind data are agreed, depending on iteration rounds. Larger masterplans or multi-building packages take longer because context modelling and mitigation cycles expand. Build float into the pre-application programme so results can still change the design.
Is CFD accepted by UK planning authorities instead of a wind tunnel?
Many authorities accept well-documented CFD for mid-rise and moderately complex schemes when criteria, climate data and mitigation are transparent. Very tall or highly sensitive proposals may still be asked for tunnel testing or independent review. Confirm local validation expectations early with the planning team.
What is the difference between CFD wind assessment and a desktop wind review?
A desktop review uses rules of thumb, precedent and limited calculation. CFD resolves flow patterns around the actual massing and neighbouring forms. Desktop work can screen risk; CFD is what you use when you need location-specific maps and defensible numbers.
Can wind CFD support BREEAM on UK projects?
Yes. Results often support outdoor comfort discussions and design decisions linked to indoor environmental quality and passive strategies, depending on the scheme version and credits pursued. Align the consultant brief with the BREEAM assessor so evidence format matches the credit intent.
What inputs must the design team provide?
Provide current massing models, surrounding context, finished floor levels, key entrance and amenity locations, facade zone drawings where loads are required, and any planning or certification criteria already set. Incomplete geometry is the main cause of rework and delayed reports.
What do CFD wind assessment consultants do differently on tall buildings?
On tall buildings they pay closer attention to downdraughts, corner acceleration, stack interaction with podiums and elevated terrace comfort, and they often couple pedestrian maps with facade load extraction. Thresholds stay strict because small geometric changes can move a main entrance from acceptable to uncomfortable.
How should mitigations be tested in the fee proposal?
Ask for a defined number of mitigation iterations inside the base fee, plus a clear rate for extras. Effective proposals test buildable options such as canopies, screens, porosity and modest massing moves, then show quantitative improvement rather than only qualitative advice.
When should temporary works wind be included?
Include it when the construction logistics plan places public routes, site offices or lightweight hoardings in accelerated flow zones, especially on dense city sites. Early contractor involvement helps the CFD team model realistic temporary geometry rather than guess.
