Abstract

Turbulent free surface flows are encountered in many hydraulic and water resources engineering problems. In this work, the CFD code Fluent is used to study the meshing effect on the hydrodynamic structure around water Darrieus rotor. This code is based on solving steady Navier-Stokes equations by a finite volume discretization model. The numerical approach used is the multi reference frame (MRF) model. The validation of our computer model is done by the comparison with experimental anterior results.

Highlights

  • Hydro-kinetic turbine electricity generation is mainly aimed for rural use at sites remote from existing electricity grids

  • Vertical turbines generally used for small scale power generation and these are less expensive anad required less maintenance compared to horizontal axis water turbines

  • The single streamtube model [2], the multiple streamtubes model [3], the double-multiple streamtubes (DMS) model [4, 5] are all derived from the actuator disk theory introduced by Glauert for horizontal axis wind turbines [6]

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Summary

Introduction

Hydro-kinetic turbine electricity generation is mainly aimed for rural use at sites remote from existing electricity grids. The unsteady effects can be taken into account with different empirical models which introduce a delay in the blade response [7] These simplified models have been applied with success to Darrieus wind turbines. RANS models have been compared with experimental power, torque, blade loadings or velocity fields In this application, we have conducted a numerical investigation of Darrieus rotor for low-head hydropower generation. The computer results consist on presentation of the velocity field, the velocity magnitude, the static pressure, the dynamic pressure, the turbulent kinetic energy, the dissipation rate of turbulent kinetic energy, the turbulent viscosity and the magnitude vorticity These results offer local information about the flow around the turbine inside the duct and improve that the axial velocity value is more effective with refinement of the mesh.

Meshing
Numerical Approach
Geometry System and Boundary Conditions
Numerical Results
Velocity Fields
Static Pressure
Dynamic Pressure Figures 9 and 10 illustrate the distribution of the dynamic
Turbulent Viscosity
Magnitude Vorticity
Comparison with Experimental Results
Conclusions
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