Characteristics of Pedestrian Level Wind Environment in Twisted Wind Flows around a Row of Buildings

摘要

The influence of twisted wind flows on pedestrian-level wind environments was evaluated by testing 9 models of a row of buildings in a boundary layer wind tunnel by the use of two twisted (TWP) and a conventional (CWP) wind profiles. The mean wind speeds at 10 mm height were measured by the use of Irwin sensors and expressed as the normalized mean wind speed ratio (K). The calculated K values in building gaps (K_(gap)) were smaller for twisted wind flows than for CWP. Moreover, dissimilar K_(gap) values found in two gaps of building rows for twisted wind flows compared to equal values in CWP. This dissimilarity increased with gap widths and decreased building heights. Despite these differences, calculated K_(gap) values confirmed that the twisted wind flows generated alike flow regimes such as in CWP for similar gap widths. Based on the results of the study presented, it is recommended (1) to locate recreational areas near the most shielded building gap and (2) to construct buildings with sufficient separation distances to avoid occurring of interaction flow regime inside building gaps.