In this paper, an advanced boundary element method (BEM) with thin-body capabilities is applied to model multiple cells of ®ber-reinforced composites with the consideration of the interphases. E€ects of the multiple-cell models, as compared to the unit-cell model, in determining the e€ective material constants in the transverse plane, are studied. In this BEM approach, the interphases are model...

Despite the significant number of boundary element method (BEM) solutions of time-dependent problems, certain concerns still need to be addressed. Foremost among these is the impact of different time discretization schemes on the accuracy of BEM modeling. Although very accurate for steady-state problems, the boundary element methods more often than not are computationally challenged when applie...

Curved tip extensions are among the rotor innovation concepts that can contribute to higher performance and lower cost of horizontal axis wind turbines. One key drivers exploit their advantages is use accurate efficient computational aerodynamic models during design stage. The present work gives an overview different state-of-the-art models. following tools were employed, in descending order co...

Three dimensional image reconstruction for multi-modality optical spectroscopy systems needs computationally efficient forward solvers with minimum meshing complexity, while allowing the flexibility to apply spatial constraints. Existing models based on the finite element method (FEM) require full 3D volume meshing to incorporate constraints related to anatomical structure via techniques such a...

The excessive burning of the fossil fuels has excessively changed global temperature in last few decades. warming caused due to initiated a need increasing use renewal energy sources. wind is one renewable sources that can mitigate dependency on fuels. For locations with low-to-medium speeds (less than 7 m/s), main problem starting turbine. To start stationary turbine, not only it necessary ove...

An experimental and numerical investigation about the pitch imbalance effect on a wind turbine model is performed. The characterization of power losses loads generated small-scale validation an analytical framework for performance unbalanced rotors are proposed. Starting from optimal collective assessment (performed to identify condition with maximum coefficient), just one blade was systematica...

A blade element momentum theory propeller model is coupled with a commercial RANS solver. This allows the fully appended self propulsion of the autonomous underwater vehicle Autosub 3 to be considered. The quasi-steady propeller model has been developed to allow for circumferential and radial variations in axial and tangential inflow. The non-uniform inflow is due to control surface deflections...

In this chapter we investigate local errors and condition numbers in the BEM. The results of these investigations are important in guiding adaptive meshing strategies and solvability of linear systems in BEM. We show that the local error for the BEM with constant or linear elements decreases quadratically with the boundary element mesh size. We also investigate better ways of treating boundary ...