Abstract
We investigate the velocity profiles over roughness elements, which are spheres or hemispheres sticked densely on the surface of the wind-tunnel bed, and the forces exerted on them, which can be calculated by measuring the surface-pressure distributions. On the other hand, the existing critical shear stresses or tractive forces depend on not only the time-mean but also the instantaneous values of the boundary shear stress. But there are little reports on the probability density distribution of hydrodynamic forces on roughness wall. The temporal distribution of the drag forces exerted on densely placed spherical roughness elements is investigated experimentally.
| Original language | English |
|---|---|
| Pages (from-to) | 47-54 |
| Number of pages | 8 |
| Journal | Doboku Gakkai Rombun-Hokokushu/Proceedings of the Japan Society of Civil Engineers |
| Issue number | 399 pt 2-10 |
| Publication status | Published - 1988 Nov |
| Externally published | Yes |
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ASJC Scopus subject areas
- Engineering(all)
Cite this
Experimental study on velocity profiles over the bed roughened with spheres or hemispheres and fluid forces exerted on them. / Kikkawa, Hideo; Uematsu, Ryuji; Jyo, Mamoru; Sekine, Masato.
In: Doboku Gakkai Rombun-Hokokushu/Proceedings of the Japan Society of Civil Engineers, No. 399 pt 2-10, 11.1988, p. 47-54.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Experimental study on velocity profiles over the bed roughened with spheres or hemispheres and fluid forces exerted on them
AU - Kikkawa, Hideo
AU - Uematsu, Ryuji
AU - Jyo, Mamoru
AU - Sekine, Masato
PY - 1988/11
Y1 - 1988/11
N2 - We investigate the velocity profiles over roughness elements, which are spheres or hemispheres sticked densely on the surface of the wind-tunnel bed, and the forces exerted on them, which can be calculated by measuring the surface-pressure distributions. On the other hand, the existing critical shear stresses or tractive forces depend on not only the time-mean but also the instantaneous values of the boundary shear stress. But there are little reports on the probability density distribution of hydrodynamic forces on roughness wall. The temporal distribution of the drag forces exerted on densely placed spherical roughness elements is investigated experimentally.
AB - We investigate the velocity profiles over roughness elements, which are spheres or hemispheres sticked densely on the surface of the wind-tunnel bed, and the forces exerted on them, which can be calculated by measuring the surface-pressure distributions. On the other hand, the existing critical shear stresses or tractive forces depend on not only the time-mean but also the instantaneous values of the boundary shear stress. But there are little reports on the probability density distribution of hydrodynamic forces on roughness wall. The temporal distribution of the drag forces exerted on densely placed spherical roughness elements is investigated experimentally.
UR - http://www.scopus.com/inward/record.url?scp=0024106036&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=0024106036&partnerID=8YFLogxK
M3 - Article
SP - 47
EP - 54
JO - Doboku Gakkai Rombun-Hokokushu/Proceedings of the Japan Society of Civil Engineers
JF - Doboku Gakkai Rombun-Hokokushu/Proceedings of the Japan Society of Civil Engineers
SN - 0289-7806
IS - 399 pt 2-10
ER -