< Back to Blog

January 2019

,

Luma Bendini

Wind climate assessment on an urban area: a case study

The Huddinge Case in Stockholm, Sweden

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

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

1area-of-interest-logo-1

Wind forecast

Meteorological data is important to assess predominant winds in the area of interest and how often they behave at a certain speed range.

So, the table below shows average wind behaviour 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 southern and westerly winds are predominant in the area.

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

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

chart 

Source: Swedish Meteorological and Hydrological Institute (SMHI)

 

Wind Direction: Southwest

The wind from southwest creates interesting areas where the wind is accelerated between buildings (Venturi Effect), but none of them affect the area close to the building of interest because it’s protected by the neighbouring houses.

The structures in front of the building of interest deviate the air as visualised with streamlines, representing the path of the wind particles.

3slicesouthwest-logo-1

4streamlinessouthwest-logo

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 a gentle breeze.

5slicesouth-logo

6streamlinessouth-logo

 

Wind Direction: Northwest

The wind from the northwest direction creates interesting areas where the wind is accelerated between the buildings (Venturi Effect) but none of them affect the area close to the building of interest because it’s protected by the neighbouring houses.

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

7slicenorthwest-logo-1

8streamlinesnorthwest-logo

 

Wind Direction: West

The wind from the west behaves mostly the same as the northwest wind, accelerating between buildings and creating the Venturi Effect. But none of them affect the area close to the building of interest.

It seems as though the gap in the building of interest is spot on. The air blows from the west, hits the building, 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.

9slicewest-logo

10streamlineswest-logo

How much does it cost?

Ingrid Cloud is a do-it-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 USD.

Send us a message to know how much a wind assessment like this one showed here would cost for your project. 

Conclusion: The building is well-sheltered

  • The building of interest is well-sheltered by neighbouring houses for the cases examined.
  • A quick recap of this wind assessment: the wind was analysed at pedestrian level (2m/s) for 4 different and predominant wind directions.
  • For southwest, west and northwest directions, the air is not noticeable with speeds lower than 1m/s.
  • From the south, the wind can blow with a velocity of 3 m/s at Centralvägen and is experienced as a gentle breeze. The building is well-sheltered by neighbouring houses for the cases examined. The courtyard of the building of interest is sheltered from the wind.

Useful links: