Abstract
The present paper reports a thorough comparison of the turbulent flow characteristics exhibited by a cubic surface-mounted obstacle and a simple geometric variant (gable roof of 30° roof pitch). The measurements supporting this study were obtained by the use of a 2D-DPIV system. Significant differences in the large-scale vortical structures and turbulent kinetic energy fields implied drastic consequences with respect to the advective and turbulent dispersive characteristics of the flow at roof and ground levels.
This is a preview of subscription content, log in via an institution to check access.
Similar content being viewed by others
Notes
A reviewer noted that the location of the maximum of q over the gable roof seen in Fig. 6 concurs with his observations of the full-scale consequences (roof tiles blown off by a wind gust) of a serious storm that occurred last year in the area of his residence.
References
Adrian RJ, Christensen KT, Liu Z-C (2000) Analysis and interpretation of instantaneous turbulent velocity fields. Exp Fluids 29:275–290
Baur T, Köngeter J (1999) PIV with high temporal resolution for the determination of local pressure reductions from coherent vortices. In: Proc 3rd Int Worksh on Particle Image Velocimetry, California, 16–18 September, pp 101–106
Brücker C (1995) Digital-particle-image-velocimetry (DPIV) in a scanning light-sheet: 3D starting flow around a short cylinder. Exp Fluids 19:255–263
Castro IP, Robins AG (1977) The flow around a surface-mounted cube in uniform and turbulent streams. J Fluid Mech 79:307–335
Cermak JE (1975) Applications of fluid mechanics to wind engineering—a Freeman Scholar lecture. J Fluids Eng 97:9–38
Dubief Y, Delcayre F (2000) On coherent-vortex identification in turbulence. J Turbulence 1, pap 011
Freek C, Raposo JMF, Sousa JMM, Hentschel W, Merzkirch W (1998) On the accuracy of a DIC-PIV system based on massive sampling. In: Proc 9th Int Symp on Applications of Laser Techniques to Fluid Mechanics, Lisbon, Portugal, 13–16 July, pap 13.1
Freek C, Sousa JMM, Hentschel W, Merzkirch W (1997) Digital image compression PIV: a tool for IC-engine research. In: Proc 7th Int Conf on Laser Anemometry Advances and Applications, Karlsruhe, Germany, 8–12 September, pp 455–464
Freek C, Sousa JMM, Hentschel W, Merzkirch W (1999) On the accuracy of a MJPEG-based digital image compression PIV system. Exp Fluids 27:310–320
Holmes JD (1981) Wind pressures and forces on tropical houses. Wind Eng Rep 4/81, James Cook University, Townsville, Australia
Hunt JCR, Abell CJ, Peterka JA, Woo H (1978) Kinematical studies of the flows around free or surface-mounted obstacles: applying topology to flow visualization. J Fluid Mech 86:179–200
Hunt JCR, Wray AA, Moin P (1988) Eddies, stream, and convergence zones in turbulent flows. Report CTR-S88, Center for Turbulence Research
Kanda M, Maruta E (1993) Characteristics of fluctuating wind pressure on long low-rise buildings with gable roofs. J Wind Eng Ind Aerod 50:173–182
Martinuzzi R, Tropea C (1993) The flow around surface-mounted, prismatic obstacles placed in a fully developed channel flow. J Fluids Eng 115:85–92
Natarajan V, Chyu MK (1994) Effect of flow angle-of-attack on the local heat/mass transfer from a wall-mounted cube. J Fluids Eng 116:552–560
Oikawa S, Meng Y (1997) A field study of diffusion around a model cube in a suburban area. Bound-Lay Meteorol 84:399–410
Peterka JA, Hosoya N, Dodge S, Cochran L, Cermak JE (1998) Area-average peak pressures in a gable roof vortex region. J Wind Eng Ind Aerod 77–78:205–215
Rafailidis S (1997) Influence of building areal density and roof shape on the wind characteristics above a town. Bound-Lay Meteorol 85:255–271
Raffel M, Willert C, Kompenhans J (1998) Particle image velocimetry: a practical guide. Springer, Berlin Heidelberg New York
Robinson O, Rockwell D (1993) Construction of three-dimensional images of flow structure via particle tracking techniques. Exp Fluids 14:257–270
Saathoff P, Stathopoulos T, Wu H (1998) The influence of freestream turbulence on near-field dilution of exhaust from building vents. J Wind Eng Ind Aerod 77–78:741–752
Schofield WH, Logan E (1990) Turbulent shear flow over surface mounted obstacles. J Fluids Eng 112:376–385
Sousa JMM (2002) Turbulent flow around a surface-mounted obstacle using 2D-3C DPIV. Exp Fluids 33:854–862
Sousa JMM, Freek C, Pereira JCF (2000) PIV measurements of turbulence statistics in the three-dimensional flow over a surface-mounted obstacle. In: Adrian RJ, Durăo DFG, Durst F, Heitor MV, Maeda M, Whitelaw JH (eds) Laser techniques applied to fluid mechanics. Springer, Berlin Heidelberg New York, pp 157–176
Stathopoulos T, Wank K, Wu H (2001) Wind pressure provisions for gable roofs of intermediate roof slope. Wind Struct 4:119–130
Westerweel J (1993) Digital particle image velocimetry: theory and application. PhD Thesis, Delft University of Technology
Westerweel J (1994) Efficient detection of spurious vectors in particle image velocimetry data. Exp Fluids 16:236–247
Westerweel J (1995) Noise reduction by discrete image shifting in DPIV. In: Crowder J (ed) Flow visualization VII. Begell House, New York, pp 688–694
Xu YL, Reardon GF (1998) Variations of wind pressure on hip roofs with roof pitch. J Wind Eng Ind Aerod 73:267–284
Yanta WJ, Smith RA (1973) Measurements of turbulent-transport properties with a laser Doppler velocimeter. In: Proc 11th Aerospace Sci Meet, Washington, DC, AIAA pap 73–169
Author information
Authors and Affiliations
Corresponding author
Rights and permissions
About this article
Cite this article
Sousa, J.M.M., Pereira, J.C.F. DPIV study of the effect of a gable roof on the flow structure around a surface-mounted cubic obstacle. Exp Fluids 37, 409–418 (2004). https://doi.org/10.1007/s00348-004-0830-2
Received:
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.1007/s00348-004-0830-2