Computational Fluid Dynamics (CFD) Mesh Independency Study of A Straight Blade Horizontal Axis Tidal Turbine

This paper numerically investigates a 3D mesh independency study of a straight blade horizontal axis tidal turbine modelled using Computational Fluid Dynamics (CFD). The solution was produced by employing two turbulence models, the standard k-&amp;epsilon; model and Shear Stress Transport (SST) in ANSYS CFX. Three parameters were investigated: mesh resolution, turbulence model, and power coefficient in the initial CFD, analysis. It was found that the mesh resolution and the turbulence model affect the power coefficient results. The power coefficients obtained from the standard k-&amp;epsilon; model are 15% to 20% lower than the accuracy of the SST model. It can also be demonstrated that the torque coefficient increases with the increasing Tip Speed Ratio (TSR), but drops drastically after TSR = 5 and k-&amp;epsilon; model failing to capture the non-linearity in the torque coefficient with the increasing TSR.</jats:p

Combination of OHA Therapy in Type 2 Diabetes Mellitus

O.H.A. are the most common form of treatment of Type2 D.M. worldwide. When used judiciously they are important agents in the management of the most common form of diabetes. For economic, logistic and general effectiveness, oral agents are a dependable means of treating a large population of diabetics worldwide when used correctly

A computational design method for bio-mimicked horizontal axis tidal turbines

Purpose The purpose of this paper is to conduct a comparative analysis between a straight blade (SB) and a curved caudal-fin tidal turbine blade (CB) and to examine the aspects relating to geometry, turbulence modelling, non-dimensional forces lift and power coefficients. Design/methodology/approach The comparison utilises results obtained from a default horizontal axis tidal turbine with turbine models available from the literature. A computational design method was then developed and implemented for “horizontal axis tidal turbine blade”. Computational fluid dynamics (CFD) results for the blade design are presented in terms of lift coefficient distribution at mid-height blades, power coefficients and blade surface pressure distributions. Moving the CB back towards the SB ensures that the total blade height stays constant for all geometries. A 3D mesh independency study of a “straight blade horizontal axis tidal turbine blade” modelled using CFD was carried out. The grid convergence study was produced by employing two turbulence models, the standard k-ε model and shear stress transport (SST) in ANSYS CFX. Three parameters were investigated: mesh resolution, turbulence model, and power coefficient in the initial CFD, analysis. Findings It was found that the mesh resolution and the turbulence model affect the power coefficient results. The power coefficients obtained from the standard k-ε model are 15 to 20 per cent lower than the accuracy of the SST model. Further analysis was performed on both the designed blades using ANSYS CFX and SST turbulence model. The variation in pressure distributions yields to the varying lift coefficient distribution across blade spans. The lift coefficient reached its peak between 0.75 and 0.8 of the blade span where the total lift accelerates with increasing pressure before drastically dropping down at 0.9 onwards due to the escalating rotational velocity of the blades. Originality/value The work presents a computational design methodological approach that is entirely original. While this numerical method has proven to be accurate and robust for many traditional tidal turbines, it has now been verified further for CB tidal turbines

Mergers and aquisitions in India:motives,barriers and outcomes

This paper examines the various factors that need to be accounted for while analysing a company undertaking a merger or an acquisition. From the motives behind the decisions to enter into a Merger or Acquisition to the barriers it faces during the process to the immediate as well as future outcomes have been projected in this research. Four case studies have been analysed showing the overall picture of the deal, the cases were: The TataCorus acquisition, The BhartiAirtel and Zain acquisition, The Tata Motors and Jaguar Land Rover acquisition and The Jet Airways attempted acquisition of Air Sahara. The analysis was broken into two components: qualitative and quantitative. For the qualitative component I have used SWOT analysis to describe the companies and then used the Ansoff’s matrix to depict the various motives to engage in mergers. The quantitative component is analysed by using financial ratios such as Return on assets, Return on equity, Profit margin, Debt equity, Price earning, Earnings Per Share, Market Price and Interest coverage along with a share price analysis against the BSE and an event study showing if there is any abnormal returns that occur on or around the announcement date of the acquisition. Through the analysis I found that most companies have a common motive to engage in mergers and acquisitions which is the market development strategy to expand globally through cross border Mergers and Acquisitions, to create global brand names or to take advantage of low cost operations. Also it was seen that in the barriers faced by the company there were counter bids from potential acquirers along with government refusal, integration problems and cultural differences. The outcomes depends on how the company has funded the Merger/Acquisition, i.e. whether it was an all-cash deal or was through loans raised, which affect the financials of the company increasing its debt or lowering its equity and also affects the profit earning capacity of the Merged/Acquired company it was also observed that there were abnormal returns on and around the announcement date and this was shown to be negative for the acquiring company

Performance and Microarchitectural Analysis for Image Quality Assessment

This thesis presents performance analysis for five matured Image Quality Assessment algorithms: VSNR, MAD, MSSIM, BLIINDS, and VIF, using the VTune ... from Intel. The main performance parameter considered is execution time. First, we conduct Hotspot Analysis to find the most time consuming sections for the five algorithms. Second, we perform Microarchitecural Analysis to analyze the behavior of the algorithms for Intel's Sandy Bridge microarchitecture to find architectural bottlenecks. Existing research for improving the performance of IQA algorithms is based on advanced signal processing techniques. Our research focuses on the interaction of IQA algorithms with the underlying hardware and architectural resources. We propose techniques to improve performance using coding techniques that exploit the hardware resources and consequently improve the execution time and computational performance. Along with software tuning methods, we also propose a generic custom IQA hardware engine based on the microarchitectural analysis and the behavior of these five IQA algorithms with the underlying microarchitectural resources.School of Electrical & Computer Engineerin