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Benjamin Torner, Duc Viet Duong and Frank-Hendrik Wurm
The correct computation of flows over rough surfaces in technical systems, such as in turbomachines, is a significant issue for proper simulations of their performance data. Once the flow over rough surfaces is adequately computed in these machines, simu...
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Stephen C. Medeiros
Mangroves are a natural feature that enhance the resilience of natural and built coastal environments worldwide. They mitigate the impacts of hurricanes by dissipating energy from storm surges and waves, as well as reducing wind speeds. To incorporate ma...
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Yong Luo, Yakun Wang, Heng Guo, Xiaobo Liu, Yihui Luo and Yanan Liu
Accurate determination of the surface roughness is of significant importance in estimating the mechanical and hydraulic behaviors of rock joints. The correlation between joint roughness coefficient (JRC) and various statistical roughness parameters calcu...
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Soonseok Song, Yigit Kemal Demirel, Claire De Marco Muscat-Fenech, Tonio Sant, Diego Villa, Tahsin Tezdogan and Atilla Incecik
Research into the effects of hull roughness on ship resistance and propulsion is well established, however, the effect of heterogeneous hull roughness is not yet fully understood. In this study, Computational Fluid Dynamics (CFD) simulations were conduct...
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Clémentine Chirol, Carl L. Amos, Hachem Kassem, Alice Lefebvre, Georg Umgiesser and Andrea Cucco
Estimates of bed roughness used for predictions of sediment transport are usually derived either from simple scalars of the physical roughness (i.e., ripple height or grain size) or from the hydrodynamic roughness length (Zo) based upon velocity gradient...
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Ruslan Djajadi
Pág. pp. 113 - 118
This paper reviews the applicability of nine selected expressions in determining the equivalent value of the Manning coefficient of roughness. For this purpose, a prismatic 4m-long and 0.05m-wide trapezoidal-shape channel was constructed, namely the homo...
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A. BIROL KARA,AHSHA TRIBBLE,PAUL H. RUSCHER
This paper is concerned with the sensitivity of the forecasts obtained from the "Florida State University Atmospheric Boundary Layer (FSU1DPBL) Model" when solely considering a variation in the roughness length parameter. The model is mainly used to e...
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Yan Chen, Chunxiang Gao and Wuli Chu
In order to prolong the service life of multistage axial compressors, it is increasingly important to study the influence of blade surface roughness on the compressor performance. In this paper, a five-stage axial compressor of a real aero-engine was sel...
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Xiaoke He, Yingchong Zhang, Chuan Wang, Congcong Zhang, Li Cheng, Kun Chen and Bo Hu
The numerical method on a double-channel sewage pump was studied, while the corresponding experimental result was also provided. On this basis, the influence of wall roughness on the pump performance was deeply studied. The results showed that there was ...
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Mohamed Soliman, Mohamed M. Morsy and Hany G. Radwan
Floods are one of the most dangerous water-related risks. Numerous sources of uncertainty affect flood modeling. High-resolution land-cover maps along with appropriate Manning?s roughness values are the most significant parameters for building an accurat...
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Qingxia Zhang, Jilin Hou, Zhongdong Duan, Lukasz Jankowski and Xiaoyang Hu
Road roughness is an important factor in road network maintenance and ride quality. This paper proposes a road-roughness estimation method using the frequency response function (FRF) of a vehicle. First, based on the motion equation of the vehicle and th...
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Yu Zheng, Piaopiao Gao, Lianqiong Jiang, Xiaochao Kai and Ji?an Duan
The side wall profile roughness of the silicon waveguide prepared by electron beam lithography and reactive ion etching is extracted by using the boundary tracing method. The maximum, minimum, and average roughness values are extracted from the side wall...
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Wei Cui, Wenxue Chen, Xiangpeng Mu, Qilin Xiong, Junqiang Li, Xiaochen Li, Zhe Liu and Zheqi Zhang
The roughness of the aqueduct in the Middle Route of the South-to-North Water Diversion Project has increased due to factors such as the natural aging of concrete and biological attachment. To increase the flow capacity of the project, a roughness reduct...
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Orhan Gülcan, Kadir Günaydin and Alican Çelik
The present study focuses on producibility and surface roughness characteristics of airfoil geometries and their effect on aerodynamic performance for different velocities, surface roughness values and angles of attack. Two different tray orientations (a...
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Suresh Kumar Thappeta, Peter Fiener and Venu Chandra
Accurate estimation of head loss introduced via randomly placed roughness elements found in natural or constructed streams (e.g., fish passages) is essential in order to estimate flow variables in mountain streams, understand formation of niches for aqua...
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Saman Fattahi, Takuya Okamoto and Sharifu Ura
In smart manufacturing, human-cyber-physical systems host digital twins and IoT-based networks. The networks weave manufacturing enablers such as CNC machine tools, robots, CAD/CAM systems, process planning systems, enterprise resource planning systems, ...
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Rahma Yanda, Morihiro Harada, Ichiro Tamagawa
Pág. 64 - 76
The dependence of flow velocity distribution near the bed on the roughness geometry has led to various approaches for estimating the velocity. Themodels proposed bypreviousstudies aremostlybased on segmented velocityprofiles(e.g., a linear distribution w...
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Pramote Koowattanasuchat, Numpon Mahayotsanun, Sedthawatt Sucharitpwatskul, Sasawat Mahabunphachai and Kuniaki Dohda
In heat exchange applications, the heat transfer efficiency could be improved by surface modifications. Shot peening was one of the cost-effective methods to provide different surface roughness. The objectives of this study were (1) to investigate the in...
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A'rasy Fahruddin
Pág. 55 - 60
This research concerned the standard value of surface roughness on Computer Numerical Control (CNC) to obtain fine pipe cutting result and is more useful for company to simply recognize the appropriate standard gap in designing. Standard design used is 3...
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Tânia Soares, Carlos Fernandes, Cláudia Barbosa, Mário A. P. Vaz, Tiago Reis and Maria Helena Figueiral
Polyetheretherketone is a high-performance thermoplastic polymer that can be used in 3D printing by fused deposition modeling, and is a promising material for dental applications. Some printing parameters are sensitive and can influence the properties of...
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