An example of visualization of the kinematic structure around a single building
The method of flow visualization with smoke allowed us to check the complexity of flow around an isolated building in a full-scale experiment. In the upstream zone the well established „horseshoe“ vortex could be verified. Also the frontal separation point was clearly documented. Whether the flow reattaches to the sidewalls depends on the length of the building. Of special interest was the downstream region. In this region strong interaction of the different vortex structures was observed. The rising spiral vortices, which originated at the lateral edges, are important. Also an occasional breakdown and fast reorganization of the vortex is an interesting fact.
This simple flow visualization experiment agrees well with the extensive laboratory experiments and topological criteria developed and used by Hunt (1978).
KeywordsVortex Smoke Vortex Structure Flow Visualization Separation Point
Unable to display preview. Download preview PDF.
- Castro, I., Robins, A., 1977: The flow around a surface — mounted cube in uniform and turbulent streams.J. Fluid Mech. 79, 307–321.Google Scholar
- Halitsky, J., 1968: Gas difusion near buildings. In:Meteorology and Atomic Energy (Slade, D. H., ed.). U.S.A.E.C., 221 pp.Google Scholar
- Hunt, J. C. R., 1971: The effect of singel buildings and structures. Phil. Trans. Roy. Soc. of London, A 269, 457–467.Google Scholar
- Hunt, J. C. R., Abell, C. J., Peterka, J. A., Woo, H., 1978: Kinematical studies of the flow around free or surface — mounted obstacles; applying topology to flow visualization.J. Fluid Mech. 86, 179–200.Google Scholar
- Merony, R. N., 1982: Turbulent diffusion near buildings. InEngineering Meteorology (Plate, E., ed.). Amsterdam: Elsevier, 481 pp.Google Scholar
- Ogawa, Y., Oikawa, S., 1982: A field investigation of flow and diffusion around a model cube.Atmos. Environ. 16, 207–222.Google Scholar
- Ogawa, Y., Oikawa, S., Kehara, K., 1983: Field and Wind tunnel study of the flow and diffusion around a model cube — 1. Flow measurements.Atmos. Environ. 17, 1145–1159.Google Scholar