8 research outputs found
A STUDY ON SERVICE QUALITY WITH REFERENCE TO VK HONDA
No full text<p>A service is something that the public needs, such as transport, communications facilities, hospitals, or energy supplies, which are provided in a planned and organized way by the government or an official body.</p>
An immersed boundary method based on domain decomposition
No full textA novel immersed boundary method based on a domain decomposition approach is proposed in the context of a finite element discretisation method. It is applicable to incompressible flows past rigid, deforming, or moving bodies. In this method, unlike most immersed boundary methods, strong boundary conditions are imposed in the regions of the computational domain that are occupied by the structure. In order to achieve this, the proposed formulation decomposes the computational domain by splitting the finite element test functions into solid and fluid parts. In the continuous Galerkin formulation, this produces a smeared representation of the fluid-structure interface. The absence of an immersed boundary forcing term implies that the method itself has no influence on the CFL stability criterion. Furthermore, the stiffness matrix in the momentum equation is sparser than compared with other forcing immersed boundary methods, and symmetry and positive-definiteness of the Laplacian operator in the pressure equation is preserved. As shown in this paper, stability and accurate imposition of boundary conditions make the method promising for high Reynolds number flows. The method is applied to the simulations of two-dimensional laminar flow over stationary and moving cylinders, as well as a moderately high Reynolds number flow past an aerofoil. Good results are obtained when compared with those from previous experimental and numerical studies.Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.Wind Energ
Propagation of premixed flames in confined channels
No full textThe propagation of premixed flames in confined channels is investigated. In the unconfined case, the structure of the flame and the flame speed for the adiabatic planar flame have been numerically obtained and confirmed with the existing theory. It is seen that in the unconfined case, the flame propagates in nearly isobaric conditions with a constant flame speed whereas in the confined case there is pressure buildup which affects the flame speed. In the confined case, the time evolution of the flame is solved to obtain properties like the mass burning rate, pressure and flame location as a function of time, velocity field in the channel and propagation speed. Also the temperature and concentration profiles are obtained which give an insight in to the thickness of the flame region as the flame propagates through the entire channel. Effect of the Lewis number on the time taken for the flame to propagate the channel is examined. A non-linear analytical model that treats the flame as a discontinuity is also used to compare with the obtained numerical solution. This model requires only solving the hydrodynamic equations along with the Hugoniot jump relations across the flame front. The main difference between the numerical and the analytical solution is that the numerical solution takes into consideration a finite rate chemistry whereas in the analytical solution the reaction rate modeled as a delta function. Differences between the analytical and the numerical solution are compared.Item withdrawn by Mark Zulauf ([email protected]) on 2013-04-22T20:51:45Z
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Study of a passive pitching rotor using blade element momentum theory coupled to a rigid-body model
No full textMisaligned wind turbine rotors experience uneven loads because of two effects: dissymmetry of lift, and skewed wake effect. Rotor-crafts that have a similar problem introduce various mechanisms to combat this - one of them is to add a δ3-hinge. The hinge provides the blade with an additional degree of freedom to relieve the unbalanced loads; in theory, it is a self-correcting mechanism. In this work, we couple a blade element momentum (BEM) approach for the aerodynamics to a rigid-body model that simulates the hinge rotation. The results from BEM are used to identify the working mechanisms of the hinged rotor and highlight the strengths and weaknesses of such a rotor. Wind Energ
Immersed boundary methods and their applicability in wind energy
No full textAirborne wind energy systems often use kites made of thin membranes to save material costs and increase mobility. However, this design choice increases the complexity of the aeroelastic behaviour of the system and demands high-fidelity tools. On the aerodynamic side of the multi-physics problem, it is quite challenging to create a high quality body conforming grid due to the complexity of the geometry and the degree of deformation it undergoes. Immersed boundary methods (IBMs) are quite popular in fluid-structure interaction (FSI) problems that involve arbitrarily deforming bodies with complex geometries and are more tolerant to deformations compared to mesh deforming methods like ALE. This paper will look at some of the popular IBMs, outline criteria to evaluate their applicability, and discuss the limitations they have in fulfilling those in problems involving thin membranes.Wind Energ
International Journal of Mathematical Combinatorics, Vol.4A
No full textThe International J.Mathematical Combinatorics (ISSN 1937-1055) is a fully refereed international journal, sponsored by the MADIS of Chinese Academy of Sciences and published in USA quarterly comprising 460 pages approx. per volume, which publishes original research papers and survey articles in all aspects of Smarandache multi-spaces, Smarandache geometries, mathematical combinatorics, non-euclidean geometry and topology and their applications to other sciences
Safety and Pharmacological Profile of Pattai Vallathagi
No full textINTRODUCTION: The current research was on Pattai Vallathagi to evaluate the safety and pharmacological activity in animal models. The drug Pattai vallathagi was indicated for Kuttam, Kiranthi,Kodiya Viranangal which was selected from the siddha literature“Siddha anuboga vaithiya navaneetha thirattu (part 10)” First edition-2010, pg.no:1581 authored by Hakkim P. Mohammed Abdulla sayub. The literary evidence of the drug Pattai Vallathagi strongly support that it possesses anti-inflammatory,analgesic and anti-histamine activities for that purpose. It has been selected for this study. All the ingredients were identified and authenticated by the experts.The test drug was prepared by the given procedure. The chemical analysis was done at Bio-chemistry lab, NIS. The Chemical analysis of the drug Pattai Vallathagi revealed the presence of Sulphate,Calcium, Iron, Potassium,Alkaloid, Tannin, which provided the key ingredients present in the drug thus it accounts the efficacy of the drug. The ICP-OES and HR SEM analysis was done at SAIF, IIT Madras. The ICP-OES study revealed that the heavy metals like As, Pb, Cd were found below detection limit in the test drug. Calcium,Potassium,Phosphorus,Sodium,Sulphur were present In HR SEM analysis the particle size of Pattai Vallathagi was 1.2-2.4μ Preclinical evaluation of acute and sub-acute toxicity study was carried out in K.K College of Pharmacy, Gerugambakkam and sub-chronic toxicity study of the drug was carried out in animal house, NIS, Chennai. The above studies showed that the drug Pattai Vallathagi was safe in animal models and may be tried for further studies to establish the clinical use. AIM AND OBJECTIVES : The aim of the study is to evaluate the Safety and Pharmacological profile of the test drug “PATTAI VALLATHAGI’’ in animal models . The following methodology was adopted to evaluate the safety and pharmacological activities of the test drug. Review of various information (Siddha and modern) relevant to the study. Preparation of the drug as per classical Siddha literature. Analytical study of the prepared drug : Physico chemical and phytochemical analysis, Chemical analysis to evaluate acidic and basic radicals, Heavy metal analysis, Elemental analysis, Analysis of Particle size. Screening the toxicity studys in animal models : Acute oral toxicity study (OECD – 423 Guideline), Repeated dose 28 days oral toxicity study (OECD – 407 Guideline) , Repeated dose 90 days oral toxicity study (OECD – 408 Guideline) . Evaluation of pharmacological activities in Wister albino rat and mice and guinea pig : Anti- inflammatory (Cotton pellet induced granuloma method), Analgesic (Eddy‟s hot plate method) , Anti-histamine (ileum cut terminal method). CONCLUSION : From the literature evidence, Physico chemical analysis, chemical analysis, Toxicological evaluation and Pharmacological studies, the author concludes that the drug Pattai vallathagi is safe and it has significant effect in anti-inflammatory, analgisic and anti - histamine activities It is concluded that the drug Pattai vallathagi can be used in the management of skin diseases which is cost effective and easy to prepare
