Flow around a marine propulsor under crashback operating condition is computed using the large eddy simulation methodology. The incompressible NavierStokes equations are simulated in a rotating frame of reference that rotates with the propulsor. A nondissipative and robust finite volume method developed by Mahesh et al. (2004) is used on unstructured grids. The simulation yields good mean value...

Understanding how the shape and motion of an aquatic animal affects the performance of swimming requires knowledge of the fluid forces that generate thrust and drag. These forces are poorly understood for the large diversity of animals that swim at Reynolds numbers (Re) between 10(0) and 10(2). We experimentally tested quasi-steady and unsteady blade-element models of the hydrodynamics of undul...

The frontal thrust of the Oregon accretionary prism scrapes off about 2 km of incoming sedimentary section and underlies a fault-bend fold of the first ridge landward of the abyssal plain. Scarps with associated chemosynthetic biological communities at the surface and pore-water anomalies at depth indicate that the frontal thrust is tectonically and hydrologically active. At Site 891, near seis...

Results from numerical and coldow experimental investigations of aerodynamic thrust vectoring on a small-scale aerospike thruster are presented. Thrust vectoring was created by the injection of a secondary uid into the primary ow eld normal to the nozzle axis. The experimental aerospike nozzle was truncated at 57% of its full theoretical length. Data derived from coldow thrust vectoring tests w...

This work aims to apply Acoustic Emission monitor the drilling process in carbon fibre laminates. Continuous data is captured over entire of a through hole. The use continuous acoustic emission acquisition allows identification lower frequency periodic temporal features related cutting process. A new approach analysis presented that utilises an enveloping technique study these phenomena and sho...

Throughout the spring 2013 semester I continued to work on the frictional model for a rotating lifter system. The previous frictional model assumed friction to be a constant, which only showed to be valid for sufficiently small values of . Now it has been determined that friction is proportional to the velocity, which is valid through all angular displacements. Allowing the lifters to move thro...

Natural fiber reinforced composites are becoming popular in various industrial and commercial applications as structural components. Unlike conventional materials, machining of is critical due to its heterogeneous structure. Hence, it necessary understand the behaviour composites. Hybrid with banana fly ash filler polyester matrix were fabricated then evaluated for drilling performance. Drillin...

Dynamic mechanical analysis (DMA) and drilling performance of the polypropylene (PP) composites reinforced with different volume fractions (0, 10, 20, 30, 40 50 vol.%) untreated alkali treated novel Alstonia macrophylla (AS) fiber were investigated. DMA reports showed that vol.% loaded PP imparted good thermomechanical properties in terms storage modulus (E’), loss (E”) a remarkable 366% 331% i...