Wind Load & Pedestrian Comfort

One model had to answer two different wind questions.

The facade needed an extreme pressure envelope for building-envelope development. People at entrances, passages, vehicle routes, and terraces needed a probability-based picture of everyday exposure.

The useful result came from a chain of decisions, not one contour.

Climate, geometry, numerical resolution, and exposure were kept connected so each output could be traced back to a documented assumption.

1. Represent the urban context

   What changes the wind before it reaches the site?

   Nearby buildings were retained where they could shield the development, accelerate flow through passages, or alter the wake.

   Output · One mesh-ready model for the project and its relevant surroundings.

2. Separate the climate by direction

   Is one wind speed enough?

   No. Wind frequency and power information were used to derive a mean speed for north, northeast, east, southeast, south, southwest, west, and northwest.

   Output · Eight climate conditions instead of one generic site input.

3. Create the extreme design cases

   How should rare wind events enter the model?

   A Rayleigh method converted each directional climate into a documented 50-year design speed. Applied values ranged from 20.00 to 28.10 m/s at 10 m.

   Output · A direction-specific extreme input for every compass case.

4. Resolve the places where gradients matter

   Where can the mesh change the answer?

   Approximately 40 million tetrahedral cells were concentrated near facades, edges, the ground, and occupied zones, with a coarser outer domain.

   Output · Practical domain size with local resolution around design-critical geometry.

5. Envelope facade pressure

   Which direction governs each surface?

   The highest positive pressure and most severe suction were selected independently at every facade zone across all eight simulations.

   Output · A zone-by-zone pressure schedule from −1.40 to +0.90 kPa.

6. Convert velocity into annual exposure

   How often does local acceleration matter?

   Local mean velocity in each comfort zone was combined with directional wind frequency and the source study's 6 m/s discomfort threshold.

   Output · Equivalent uncomfortable days per year for 17 zones on five horizontal planes.

7. Prioritize by consequence

   Where should design effort go first?

   The exposed JKLMN entrance and the repeated ground-level corridors ranked above naturally protected upper terraces.

   Output · A mitigation sequence tied to entrances, circulation, and occupied edges.

The governing direction changed from zone to zone.

A single windward-versus-leeward diagram would have hidden the real load pattern. Corners, roof edges, returns, and recesses moved the controlling case around the development.

The entrance carried almost seven times the exposure of the best terraces.

The same development produced sharply different outcomes. Ground-level entrances and passages concentrated flow, while upper terraces benefited from shielding and local geometry.

Interrupt the wind corridors without creating a new one.

The source study pointed to porous, staggered, and planted interventions rather than one solid barrier. The goal is to reduce local acceleration while preserving access, visibility, and useful shielding.

The study found the priorities. A validated update would close the design loop.

The portfolio edition preserves the original calculations and makes their limits explicit. A current design-stage study should now test sensitivity, compliance, and the proposed mitigation.