Browsing by Author "Suvarna, P."

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    Effect of emerged coastal vegetation on wave attenuation using open source CFD tool: REEF3D
    (Springer, 2019) Hunasanahally Sathyanarayana, H.S.; Suvarna, P.; Abhijith, P.A.; Prabhu, A.S.; Umesh, U.; Kamath, A.
    Coastal vegetation is a soft solution for protecting the coast from the action of waves by attenuating the wave height and reducing the energy of the waves. Effect of wave height attenuation as a result of the presence of emerged coastal vegetation is studied numerically by resolving the Reynolds-averaged Navier–Stokes (RANS) equations. A three-dimensional numerical wave tank model is simulated using an open source computational fluid dynamics (CFD) software REEF3D, and wave attenuation due to emerged coastal vegetation is determined. An artificial, rigid, emerged vegetation for a length of 2m is developed in a numerical wave tank of REEF3D. The model is tested for regular waves of height 0.08, 0.12, and 0.16 m and wave periods of 1.8 and 2 s in a water depth of 0.40 and 0.45 m. The wave heights are measured at different locations along the vegetation meadow at 0.5 m intervals. The devolved numerical model is corroborated by comparing the obtained numerical results with the experimental results as reported by John et al. (Experimental investigation of wave attenuation through artificial vegetation meadow, ISH—HYDRO, [1]). The numerically obtained results are concurrent with the experimental results. © Springer Nature Singapore Pte Ltd. 2019.
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    Numerical investigation of wave interaction with pile breakwater
    (2018) Rao, P.S.B.; Mathew, S.E.; Suvarna, P.; Sathyanarayana, A.H.; Umesh, P.
    Pile breakwater consists of a number of piles spaced closely. It works similar to the offshore breakwater by attenuating the energy of the waves and it is due the turbulence caused because of wave-pile interaction. The efficiency of the pile breakwater of single row and two rows is investigated numerically. An open source Computational Fluid Dynamics (CFD) software REEF3D is used in the present study. Initially the grid convergence study is conducted in a rectangular wave flume with a two-dimensional setup and the results are evaluated by comparing the numerical wave profile with the theoretical profile in accordance with the adopted wave theory. The efficiency of the numerically modelled pile breakwater is investigated in terms of the transmission coefficient. The simulations carried out are in accordance with the physical model studies as reported by Subba Rao et al., (1999). The numerically obtained results are validated with the experimental data. The numerically obtained results for the pile breakwater has shown an average of 91.5% agreement with that of experimental results. � IEOM Society International.
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    Numerical investigation of wave interaction with pile breakwater
    (IEOM Society ieom-society@iieom.org, 2018) Rao, P.S.B.; Mathew, S.E.; Suvarna, P.; Hunasanahally Sathyanarayana, A.H.; Umesh, P.
    Pile breakwater consists of a number of piles spaced closely. It works similar to the offshore breakwater by attenuating the energy of the waves and it is due the turbulence caused because of wave-pile interaction. The efficiency of the pile breakwater of single row and two rows is investigated numerically. An open source Computational Fluid Dynamics (CFD) software REEF3D is used in the present study. Initially the grid convergence study is conducted in a rectangular wave flume with a two-dimensional setup and the results are evaluated by comparing the numerical wave profile with the theoretical profile in accordance with the adopted wave theory. The efficiency of the numerically modelled pile breakwater is investigated in terms of the transmission coefficient. The simulations carried out are in accordance with the physical model studies as reported by Subba Rao et al., (1999). The numerically obtained results are validated with the experimental data. The numerically obtained results for the pile breakwater has shown an average of 91.5% agreement with that of experimental results. © IEOM Society International.
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    Numerical investigation on wave transmission characteristics of perforated and non-perforated pile breakwater
    (2019) Rao, N.; Suryanarayana, Barimar, Rao, P.; Nayak, K.; Kishor, Pal, S.; Hunasanahally, Sathyanarayana, A.; Suvarna, P.; Umesh, P.
    Dock operations, harbouring and many other port activities demand tranquil water condition. This makes breakwater structures more than essential in coastal engineering applications. For zero wave action, rubble mound or vertical wall breakwaters are used, and for small docks and shores, piles can be used as efficient breakwaters. The permeability of pile breakwaters also aides in keeping the shores clean as there is water circulation and keeps the interferences caused due to littoral drift to the minimum. Numerical study on the single row pile breakwater is carried out using an open source computational fluid dynamics (CFD) software REEF3D. Interaction of waves with non-porous pile breakwater is simulated in a three-dimensional numerical wave tank using REEF3D and resulted transmission coefficient is validated using the physical model studies as reported by Subba Rao et al. (1999). Further, the efficiency of porous piles over non-porous piles is studied by simulating wave conditions by varying wave height, wave period, water depth and percentage porosity of the piles. It has been observed from the present study that porous piles are more efficient in wave attenuation compared to non-porous piles. The reason is that perforations increase turbulence during wave interaction which results in a better wave attenuation. � Published under licence by IOP Publishing Ltd.
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    Numerical investigation on wave transmission characteristics of perforated and non-perforated pile breakwater
    (Institute of Physics Publishing helen.craven@iop.org, 2019) Rao, N.; Rao, P.; Nayak, K.; Kishor Pal, S.; Hunasanahally Sathyanarayana, A.; Suvarna, P.; Umesh, U.
    Dock operations, harbouring and many other port activities demand tranquil water condition. This makes breakwater structures more than essential in coastal engineering applications. For zero wave action, rubble mound or vertical wall breakwaters are used, and for small docks and shores, piles can be used as efficient breakwaters. The permeability of pile breakwaters also aides in keeping the shores clean as there is water circulation and keeps the interferences caused due to littoral drift to the minimum. Numerical study on the single row pile breakwater is carried out using an open source computational fluid dynamics (CFD) software REEF3D. Interaction of waves with non-porous pile breakwater is simulated in a three-dimensional numerical wave tank using REEF3D and resulted transmission coefficient is validated using the physical model studies as reported by Subba Rao et al. (1999). Further, the efficiency of porous piles over non-porous piles is studied by simulating wave conditions by varying wave height, wave period, water depth and percentage porosity of the piles. It has been observed from the present study that porous piles are more efficient in wave attenuation compared to non-porous piles. The reason is that perforations increase turbulence during wave interaction which results in a better wave attenuation. © Published under licence by IOP Publishing Ltd.