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.
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).
Source: Swedish Meteorological and Hydrological Institute (SMHI)
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.
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.
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.
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.
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.
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