Wind ripples with colored sand in a doughnut type circular wind duct

Yoshinori Kodama; Chiharu Koide

Presentation information

Oral

Symbol M (Multidisciplinary and Interdisciplinary) » M-IS Intersection

[M-IS07] geopark

Wed. May 25, 2016 9:00 AM - 10:30 AM 101A (1F)

Convener:*Takayuki Ogata(Faculty of Education, University of the Ryukyus), Takeyuki Ueki(Faculty of Risk and Crisis Management, Chiba Institute of Science), Tetsuya Waragai(Graduate School of Science and Engineering, Nihon University), Yoshihiro Hiramatsu(Faculty of Natural System, Institute of Science and Engineering, Kanazawa University), Takayuki Arima(Department of Tourism Management, Faculty of Economics, Teikyo University), Marekazu Ohno(Unzen Volcanic Area Geopark Promotion Office), Noritaka Matsubara(Graduate School of Regional Resource Management, University of Hyogo), Chair:Marekazu Ohno(Unzen Volcanic Area Geopark Promotion Office)

10:00 AM - 10:15 AM

[MIS07-05] Wind ripples with colored sand in a doughnut type circular wind duct

*Yoshinori Kodama¹, Chiharu Koide (1.Faculty of Regional Sciences, Tottori University)

Keywords:doughnut type circular wind duct, colored sand, wind ripple, secondaly flow, spatial sorting, circular wind tunnel

A doughnut type transparent circular wind duct experimental apparatus (width: 30 cm, inner diameter: 200 cm, depth: 50 cm) was made newly and colored sand according to grain sizes was installed. We performed wind ripple making experiments with 6.0 m/s wind and three issues came up: i) vent shape and position have clue to wind velocity distributions, ii) grain size mixture ratio, and iii) the secondary flow leads to spatial sorting of colored sand.