Numerical investigation of flow fields on buildings with gable roof having different roof and eave slopes

In this study, the three-dimensional flow fields in the steady state around the building models with gable roof where the roof pitch angle is 15°, 30° and 45°, and the eave pitch angle is 0°, 15°, 30°, 45° and 60° were computed for the 40000 value of the Reynolds number with Standard k-ε, RNG k-ε and Realizable k-ε turbulence models. The effect of the change in roof and eave slope angles on the flow field was investigated as calculated flow images, mean velocity and turbulence profiles around the models and mean pressure coefficient distributions on the model surfaces. In numerical solutions, wind angle of incidence is considered as 90°. Geometric changes in building models create differences in flow structures and surface pressure distributions. Differences in surface pressure distributions occur on the windward roof and eave surfaces. The most critical negative peak pressure coefficients are formed on the ridges of 15° inclined roofs. The difference between the peaks on the windward roof surfaces decreases as the angle of the eaves inclination increases. The numerical results calculated by three different turbulence models are close to each other.