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Dhiman Chatterjee
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Dhiman Chatterjee
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Dhiman Chatterjee
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Chatterjee, Dhiman
Chatterjee, D.
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3 results
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- PublicationNumerical study of turbulent flow over an S-shaped hydrofoil(01-09-2008)
;Kumar, T. Micha PremIn this paper, a numerical study of turbulent flow over the S-shaped hydrofoil at 0° angle of attack has been reported. Here, the flow takes place over concave and convex surfaces and is accompanied by the favourable and adverse pressure gradients and flow separation. Modelling such a flow poses a formidable challenge. In the present work four turbulence models, namely, k-ε- realizable, k-ω shear stress transport, v'2-f, and the Reynolds stress model (RSM) were examined. Simulations were performed on a structured grid using finite-volume method formulation. Commercial software was used for grid generation and numerical simulation. A comparison of the experimental data of Madhusudan et al. (Fluid Dyn. Res., 1994, 14(5), 241-258) and numerical predictions were made, and the suitability of turbulence models was ascertained for both the mean and turbulent quantities. It was seen that v'2-fworks better for predicting the mean quantities and the RSM for turbulent quantities. © IMechE 2008. - PublicationNumerical prediction of the performance of axial-flow hydrokinetic turbine(01-12-2013)
;Chandras, Pavan ;Sharma, LaveenaThe present work is focused on the numerical prediction of the performance of axial flow hydrokinetic turbine under practical conditions. The models are designed to produce an electrical power output of 200 W at an incoming water speed of 1 m/s. Three different models of three-bladed turbine, based on swept direction, are designed to study the effect of geometry on the turbine performance while operating under identical conditions. Numerical simulations indicate that a peak turbine power of 480 W at a tip speed ratio of 3.5 is obtained for unswept bladed turbine with sharp trailing edge. Results suggest that forward and backward swept blades perform better than the unswept blade for blunt trailing edge. Simulations are carried out for different nose profiles for hub. It is found that a turbine experiences lesser thrust force with an ellipsoidal nose having ratio of major axis to minor axis of 4. In order to capture a real life scenario effectively, the effect of turbine location inside the water, particularly with respect to the free surface is investigated further. The safe depth for turbine installation is found to be at least 1.4 m from the free surface. - PublicationNumerical prediction and optimization of the performance of axial-flow hydrokinetic turbine in an array(01-01-2019)
;Sharma, LaveenaArray of hydrokinetic turbines can be used to produce power from flowing rivers akin to the wind turbine farms. However, arriving at optimum configuration (location and number) of turbines through experimental or numerical routes is not easy. Hence in the present work, attempts have been made to utilize computationally less intensive model-based multivariate optimization techniques coupled with some numerical simulations to arrive at suitable turbine configurations in an array. In this work, we have modeled the complex functions, such as turbine power, non-linear interaction of turbines with wakes of preceding turbines and the area utilized by the turbines, by means of simplified mathematical treatment of response surface methodology. The present work has identified three turbine array geometries as potential configurations and based on numerical simulations and optimization techniques has arrived at pareto-domain and has ranked these pareto-solutions. Further simulations were carried out for the best configurations and the numerical results were compared with the optimization results as a part of the validation of the latter. Flow physics was analyzed and final recommendation of turbine array configuration is made.