M. Abbaspour; A.R. Radmanesh; M.R. Soltani
Volume 4, Issue 2 , June 2014, , Pages 89-100
Abstract
To indicate the best airfoil profile for different sections of a blade, five airfoils; included S8xx, FFA and AH series was studied. Among the most popular wind power blades for this application were selected, in order to find the optimum performance. Nowadays, modern wind turbines are using blades with ...
Read More
To indicate the best airfoil profile for different sections of a blade, five airfoils; included S8xx, FFA and AH series was studied. Among the most popular wind power blades for this application were selected, in order to find the optimum performance. Nowadays, modern wind turbines are using blades with multi airfoils at different sections. SST-K-ω model with different wind speed at large scale profile applied to simulation of horizontal axis wind turbines (HAWT). The aerodynamic simulation was accomplished using Computational Fluid Dynamic (CFD) method based on the finite volume method. The governing equations apply in this simulation are the Unsteady Reynolds Averaged Navies Stocks (URANS) equations. The aerodynamic coefficients of lift and drag were calculated at different angles of attack and different wind speeds. The results are validated by Eppler code, Xfoil and experimental data of the U.S National Renewable Energy Laboratory (NREL). The results show that S818 profile is the best profile in terms of gaining the highest lift coefficient with the lowest angel of attack at the root of the blades. The results also indicated that the selected model can predicted the exact geometry with a high precision.
A. H. Javid; M. Abbaspour; S. A. Mirbagheri; H. JanfeshanAraghi
Volume 2, Issue 2 , June 2012, , Pages 141-148
Abstract
The study of wave and its propagation on the water surface is among significant phenomena in designing quay, marine and water structures. Therefore, in order to design structures which are exposed to direct wave forces, it is necessary to study and simulate water surface height and the wave ...
Read More
The study of wave and its propagation on the water surface is among significant phenomena in designing quay, marine and water structures. Therefore, in order to design structures which are exposed to direct wave forces, it is necessary to study and simulate water surface height and the wave forces on the structures body in different boundary conditions. In this study, the propagation of static sinusoidal wave in deep water environment with complex boundary conditions are simulated by using Smoothed Particle Hydrodynamics (SPH) technique. The governing equations are programmed using VISUAL FORTRAN6.5 and the solution results are visualized using TECPLOT. After determining the suitable number of particles for simulation, the duration of sinusoidal wave oscillation are measured by simulation and are compared with analytical solution. After ensuring the accuracy and veracity of proposed SPH method in simulation of static sinusoidal wave motion on the deep water surface, the simulation are carried out in more complex boundary conditions which there are no analytical solutions.