JAN 2019, Luma Bendini

Wind climate assessment on urban area: a case study

For this case we performed 4 flow simulations (with a method capable of picturing the complex behavior of external flow in urban areas – high-fidelity), assessed metrological data and got analysis from a CFD specialist.

The Huddinge Case in Stockholm, Sweden

First thing first! If you don’t know what a Wind Study is and feel like you need an introduction, click here.

Lastly: prices are mentioned in the last paragraph.

The location

Site overview with the area of interest in red.

Wind forecast

Metrological data it’s important to acknowledge predominant winds in the area of interest and how often they behave in a certain speed range.

So, the table below shows average wind behavior in the area close to Storängshallen, Huddinge, municipality, during the year 2017. From the data acquired from Stockholm-Bromma, where the closest measuring station of the Swedish Meteorological and Hydrological Institute (SMHI) is located, it’s possible to see that South and West winds are predominant in the area.

HERE’S THE 1st CATCH: a good wind study will prioritize those directions - which Ingrid Cloud takes care for you. Of course, the more directions considered, the best you will be able to picture the scenario.

So for this case study, we will run 4 different simulations in the main wind directions (S, SW, NW, W) with the dominant inflow wind speed 2.5 m/s (S, W, NW) and 1.5 m/s (SW).

Source: Swedish Meteorological and Hydrological Institute (SMHI)

Wind Direction: South-West

The wind from South West creates interesting areas, where the wind is accelerated between buildings (Venturi Effects) but none of them affects the area close to the building of interest, because it’s protected by the neighboring houses.

The structures in front of the building of interest deviates the air as visualized with stream lines, representing the path of a wind particle.

Wind Direction: South

As indicated with arrows, the wind is split into two directions as it meets the building group. It flows alongside the periphery and does not find its way between the houses. The velocity in front of the building of interest on Centralvägen is about 3 m/s and is experienced as gentle breeze.

Wind Direction: North-West

The wind from North West creates interesting areas, where the wind is accelerated between buildings (Venturi Effects) but none of them affects the area close to the building of interest. Because it’s protected by the neighboring houses.

Note that the surrounding buildings have similar heights. So, when the air reaches the building of interest it simply blows over it.

Wind Direction: West

The wind from West behaves mostly the same as the North-West wind. Accelerating between buildings and creating the Venturi Effects. But none of them affects the area close to the building of interest.

It seems as that the gap in the building of interest is spot on. The air blows from west, hits building “west”, is directed to the courtyard, hits the wall again and is directed through the gap. There is recirculation (circulating flow) behind the building, but since the magnitude is very low, it won’t cause any problems.

Conclusion: The building is well sheltered

  • The building of interest is well sheltered by neighboring houses for the cases examined.
  • A quick recap of this wind assessment: the wind was analyzed on pedestrian level (2m/s) for 4 different and predominant wind directions.
  • For South-West, West and North-West directions the air is not noticeable, with speeds lowers than 1m/s.
  • From the South, the wind can blow with a velocity of 3 m/s on Centralvägen and is experienced as gentle breeze. The building is well sheltered by neighboring houses for the cases examined. The courtyard of the building of interest sheltered from wind.

How much does it cost?

Ingrid Cloud is a “do it by yourself” simulation tool where you can perform simulations and buy consultancy hours with our specialists. Simulation prices vary according to resolution level, starting at $124.

Drop me a message, to know how much a wind assessment like this one showed here would cost for your project: luma @ ingridcloud.com. Or sign up for a free simulations clicking here.