https://hal.archives-ouvertes.fr/hal-01145072/document

A database of capture width ratio of wave energy converters

Electrical power is essential in commercial, economic and social investments especially in emergent countries. Hydropower energy has become one of the most suitable and efficient sources of renewable energy, though it has taken more than a century of experience to actually generate efficient electricity for supply. Nowadays, most rural areas in developed and developing countries use cheap and effective micro-hydropower plants for producing electricity. To achieve more efficiency, researchers are looking forward to using simple turbines for achieving good performance with minimum initial and running cost, for utilization especially in poor countries. This paper presents a review of low head micro-hydropower turbines; focusing on categories, performance, operation and cost.

Operation, performance and economic analysis of low head micro-hydropower turbines for rural and remote areas: A review

https://pure.tue.nl/ws/files/4005764/71509143323657.pdf

CFD analysis of cross-ventilation of a generic isolated building with asymmetric opening positions : impact of roof angle and opening location

In recent era, research and development activities in the field of renewable energy, especially wind and solar, have been considerably increased, due to the worldwide energy crisis and high global emission However, the available technical designs are not yet adequate to develop a reliable distributed wind energy converter for low wind speed conditions The Savonius rotor appears to be particularly promising for such conditions, but suffers from a low efficiency Till now, a number of experimentations have been carried out in the area of Savonius rotor to increase its efficiency These large-scale experimentations involve massive costs and hazards In this context, computational studies have shown a significant importance to carry out the research with large number of physical designs and parameters Over the past four decades, investigations have been carried out with various computational methodologies and turbulence models to optimize the different parameters and hence the efficiency of these rotors In the present paper, a detailed review of various computational methods addressing the influence of various operating parameters and augmentation techniques has been reported From this review study, it is observed that with the selection of a proper computational methodology, the design, performance, and efficiency of a Savonius rotor can be enhanced significantly

Review on the numerical investigations into the design and development of Savonius wind rotors

For the research and development (R&D) of wave energy converters (WECs), numerical wave tanks (NWTs) provide an excellent numerical tool, enabling a cost-effective testbed for WEC experimentation, analysis and optimisation. Different methods for simulating the fluid dynamics and fluid structure interaction (FSI) within the NWT have been developed over the years, with increasing levels of fidelity, and associated computational expense. In the past, the high computational requirements largely precluded Computational Fluid Dynamics (CFD) from being applied to WEC analysis. However, the continual improvement and availability of high performance computing has led to the steady increase of CFD-based NWTs (CNWT) for WEC experiments. No attempt has yet been undertaken to comprehensively review CNWT approaches for WECs. This paper fills this gap and presents a thorough review of high-fidelity numerical modelling of WECs using CNWTs. In addition to collating the published literature, this review tries to make a step towards a best practice guideline for the applications of CFD in the field of wave energy.

/pdf/high-fidelity-numerical-modelling-of-ocean-wave-energy-40v9cfko54.pdf

High-fidelity numerical modelling of ocean wave energy systems: A review of computational fluid dynamics-based numerical wave tanks

http://repository.usp.ac.fj/7187/1/Computational_studies_on_the_effect_of_geometric_parameters_on_the_performance_of_a_solar_chimney_power_plant.pdf

Computational studies on the effect of geometric parameters on the performance of a solar chimney power plant

Flow and performance characteristics of a direct drive turbine for wave power generation

Validation of a piston type wave-maker using Numerical Wave Tank

A general purpose viscous flow solver Ansys CFX was used to study a Savonius type wave energy converter in a 3D numerical viscous wave tank. This paper presents the results of a computational fluid dynamics (CFD) analysis of the effect of blade configuration on the performance of two Savonius rotors for wave energy extraction. A piston-type wave generator was incorporated in the computational domain to generate the desired incident waves. A complete OWC system with a 3-bladed Savonius rotor was modeled in a three dimensional numerical wave tank and the hydrodynamic conversion efficiency was estimated. The flow over the rotors was assumed to be two-dimensional (2D), viscous, turbulent and unsteady. The CFX code was used with a solver of the coupled conservation equations of mass, momentum and energy, with an implicit time scheme and with the adoption of the hexahedral mesh and the moving mesh techniques in areas of moving surfaces. Turbulence was modeled with the k-e model. The results indicated that the developed models are suitable to analyze the water flows both in the chamber and in the turbine. For the turbine, the numerical results of pressure and torque were compared for the two cases.

Performance analysis of a wave energy converter using numerical simulation technique

Wind tunnel testing of low-rise building models with flat, gabled and hip roof configurations was carried out in a boundary layer wind tunnel. All the models had the same mean height. For the gabled and the hip roofs, the pitch angles investigated were 15, 20, 30 and 45°. Pressure measurements were performed on all the walls and the roof of the building models facing a turbulent wind of 7 m/s and the values of pressure coefficient were calculated. It was found that the suction over the roof is significantly influenced by the roof configuration. The 45° gabled and hip building models performed the best under the same wind conditions. The peak suction over the roof reduces by 85 and 91%, respectively, compared to that over the flat roof. In addition to this, the hip roof models recorded less suction compared to their gabled counterparts. For the hip roof, the peak suction reduced by 42% compared to the gabled roof.

Deepak Prasad

Papers

Computational studies on the effect of geometric parameters on the performance of a solar chimney power plant

Flow and performance characteristics of a direct drive turbine for wave power generation

Validation of a piston type wave-maker using Numerical Wave Tank

Performance analysis of a wave energy converter using numerical simulation technique

Wind loads on low-rise building models with different roof configurations