Addressing wind comfort in an urban area using an immersed boundary framework
Artikel i vetenskaplig tidskrift, 2023

Considering wind, air and heat comfort in designing new urban areas is still a challenge for city planners. Urban heat islands, or the phenomena of locally increased temperatures in urban areas compared to their rural surroundings, are becoming increasingly problematic with global warming and the rise of urbanization. Therefore, new areas must be planned considering appropriate ventilation to mitigate these high-temperature regions and cooling strategies, such as green infrastructures, must be considered. Typically, most of the comfort criteria are evaluated and assessed in the final stages of urban planning when further strategic interventions are no longer possible. Here, a numerical framework is tested that urban planners can use as a future tool to analyze complex fluid dynamics and heat transfer in the early stages of urban planning. The framework solves the RANS equations using an immersed boundary approach to discretize the complex urban topography in a cartesian octree grid. The grid is automatically generated, eliminating the complex pre-processing of urban topographies and making the framework accessible to all users. The results are validated against experimental data from wind tunnel measurements of wind-driven ventilation in street canyons. After validation, we will apply the numerical framework to estimate the wind comfort in an idealized urban area. Finally, guidelines will be provided on the choice of minimum grid sizes required to capture the relevant flow structures inside a canyon accurately.

Street Canyons

Immersed Boundary

Urban climate



Patricia Vanky

Chalmers, Mekanik och maritima vetenskaper, Strömningslära

Andreas Mark

Stiftelsen Fraunhofer-Chalmers Centrum för Industrimatematik

Franziska Hunger

Stiftelsen Fraunhofer-Chalmers Centrum för Industrimatematik

Marie Haeger-Eugensson


Göteborgs universitet

Joaquim Tarraso

Chalmers, Arkitektur och samhällsbyggnadsteknik, Stadsbyggnad

Marco Adelfio

Chalmers, Arkitektur och samhällsbyggnadsteknik, Stadsbyggnad

Angela Sasic Kalagasidis

Chalmers, Arkitektur och samhällsbyggnadsteknik, Byggnadsteknologi

Gaetano Sardina

Chalmers, Mekanik och maritima vetenskaper, Strömningslära

Technische Mechanik

0232-3869 (ISSN) 21999244 (eISSN)

Vol. 43 1 151-161

UEQ - simuleringar, visualiseringar och utvärderingar av framtida hållbara stadsmiljöer

Formas (2019-01885), 2020-01-01 -- 2023-12-31.

Digital Twin Cities Centre

VINNOVA (2019-00041), 2020-02-29 -- 2024-12-31.


Hållbar utveckling


Annan samhällsbyggnadsteknik

Strömningsmekanik och akustik



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