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EFFECTS OF REGULARLY SQUARE RIBS ROUGHNESS ON TURBULENT FLOW STRUCTURE IN CASES TWO AND THREEDIMENSIONAL ROUGHNESS IN AN OPEN CHANNEL

., Sukarno and Hendratta, Lianny and Mangangka, Isri R. and Supit, Cindy Jeane and Ohmoto, Terunori (2014) EFFECTS OF REGULARLY SQUARE RIBS ROUGHNESS ON TURBULENT FLOW STRUCTURE IN CASES TWO AND THREEDIMENSIONAL ROUGHNESS IN AN OPEN CHANNEL. In: The International Conference on Environmentally Friendly Civil Engineering Construction and Materials (EFCECM 2014), Manado - Indonesia, 13-14 November, Manado.

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          Abstract

          Effects of regularly arrayed of square roughness on turbulent characteristics in an open channel have been investigated with a completely rough bed surface with uniform stainless square ribs, where the roughness heights, k = 10mm, longitudinal spacing, � = 4cm and transverse spacing, � = 1cm. Detailed spatial measurements of streamwise and vertical velocity fluctuations were conducted using Particle Image Velocimetry (PIV) in a vertical plane along the completely rough bed surface. Experimental results indicated that the maximum values of vertical and longitudinal distribution of main flow velocity showed that two-dimensional roughness is greater than three-dimensional roughness, also showed that the maximum values of Reynold shrear stress two-dimensional roughness have occurred at the front of the roughness elements, however the maximum values of Reynold shrear stress in case of three-dimensional roughness have occurred at the behind of the roughness elements, it was evident that twodimensional roughness has two-directions of flow velocity i.e. on the x-axis and w-axis directions and three-dimensional roughness has three-direction of flow velocity on the xaxis, w-axis and v-axis directions, respectively. It was described that three-dimensional roughness has barrier to flow bigger than twodimensional roughness elements, although distribution of horizontal velocity, v-direction of this experiments yet explained.

          Item Type: Conference or Workshop Item (Paper)
          Subjects: T Technology > TA Engineering (General). Civil engineering (General)
          Divisions: UNSPECIFIED
          Depositing User: Mr. Benhard W. Tampangela, ST
          Date Deposited: 07 Sep 2017 13:40
          Last Modified: 19 Sep 2017 11:03
          URI: http://repo.unsrat.ac.id/id/eprint/1701

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