International Journal of Structural Mechanics and Finite Elements
http://mechanical.journalspub.info/index.php?journal=JSMFE
International Journal Structural Mechanics and Finite Elements publish refereed papers in highest quality reflecting the interest of scholars in the academic and industrial research and development. Papers are sought especially keeping in mind that theoretical knowledge is as important as experimental research. The journal includes type of papers that fall under the scope of structural mechanics and finite elements.en-USInternational Journal of Structural Mechanics and Finite ElementsDesign Optimization of Water Injection Module of Topside Facility of an FPSO
http://mechanical.journalspub.info/index.php?journal=JSMFE&page=article&op=view&path%5B%5D=611
Analysis, design and construction of offshores structures are the most challenging tasks in the field of ocean engineering. This work presents a method of designing topside facility of an FPSO by considering all possible environmental loading along with the loading during transportation, lifting and placing. Of all the loads wave loading is the most prominent which has been estimated using a 3D computational fluid dynamics code based on finite volume method (FVM) and volume of fluid (VOF). Other major inputs such as wind load, live loads, equipment loads and loads during transportation have been estimated using rules of various classification societies combined with structural analysis using FEM. Estimated loads having been compared with analytical methods. Structural analysis yielded the dimensions of the bracings of the topside members as the design output. The calculated utilization ratios were well within the acceptable results.Vishnuraj KS. JanardhananT. N. Sandeep2018-05-172018-05-1741Numerical Study on the Effect of Ball Baffles in Reducing Sloshing Loads in Ship Tanks
http://mechanical.journalspub.info/index.php?journal=JSMFE&page=article&op=view&path%5B%5D=612
Sloshing is the free surface motion of a liquid in a partially filled container under periodic motion. Liquid sloshing will result in dynamic pressure on the walls of the container causing large deformations to the tank as well as the supporting structures and carrier. This dynamic pressure on the tank walls due to slosh waves are conventionally mitigated in the tanks of very large crude oil carrier (VLCC) ships by means of inbuilt horizontal and vertical baffles which are designed to withstand the worst sea state. However, same designs are adopted even for calm sea states with heavy baffle arrangements increasing the weight of the total structure. Hence, it is essential to introduce an alternative arrangement of baffles in ship tankers which could be altered with varying sea states. The necessity to introduce an effective sloshing reducing baffle which is not of an inbuilt type, is discussed in this study and a suitableness of a ball shaped floating baffle arrangement hereafter referred to as ‘Ball Baffles’ is studied using RANSE based Computational Fluid Dynamics (CFD) simulations. A CFD simulation gives more or less a realistic picture of the physical phenomenon of sloshing in the inner portion of the tanks. The structural deformations of the tank and pressure on the tank walls are also studied with and without ball baffles.Jithu SygalS. Janardhanan2018-05-172018-05-1741Analysis of Fixed Offshore Platform Deck using Acceleration - Deflection Resonance Method
http://mechanical.journalspub.info/index.php?journal=JSMFE&page=article&op=view&path%5B%5D=551
Steel plate is commonly used as the flooring plate for fixed offshore platform Deck and there are several existing methods for analyzing the steel plate. In this research acceleration-displacement resonance method is developed for analyzing plate. The plate is first analyzed considering arbitrary uniformly distributed and point load with an all-round simply support. The method involves transformation of bi-harmonic equation into acceleration- deflection ratio ( R_xx). From the study, the maximum deflection and maximum bending moment of simply supported plate of the deck subjected to uniform load were obtained to be 0.0040629 (qa^4)/D and 0.0483qa^2 . Considering Simply supported plate of the deck subjected to point load, the maximum deflection obtained was 0.00114 (Pa^2)/D , maximum moment given as 0.4628P and twisting moment obtained as zero. The study has shown that, the solutions of this method are exact and the method can be readily applied on plate problems involving offshore platform, aerospace, building, naval structures and roads.Temple NwoforI. Etafo2018-06-142018-06-1441A Detailed Step-By-Step Procedure on Finding the Square Root of a 4 × 4 Positive Definite Symmetric Matrix for Engineering Applications
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The main focus of this study is to present a detailed step by step procedure to determine the square root of a symmetric positive definite non-singular matrix. The procedure involved four steps which are Gram–Schmidt orthogonalization, Schur form, U matrix, and square root of matrix, which are discussed in this study. Few examples are solved to learn and practice. Necessary checks were performed, and the results show that the square root matrix is correct.KNV CHANDRASEKHAR2018-07-082018-07-0841Prediction of Hydro-dynamic Force Coefficients and Shedding Frequency during Vortex Shedding Behind a Stationary Cylinder
http://mechanical.journalspub.info/index.php?journal=JSMFE&page=article&op=view&path%5B%5D=656
Vibration of slender cylinders caused by the shedding of vortices at the wake, known as vortex induced vibrations (VIV) is a topic of great research interest, since the phenomenon can reduce the fatigue life of marine risers, which are subjected to complex flow conditions in ocean environment. This paper studies in detail the accuracy with which hydrodynamic forces are predicted by different turbulence models such as k–ε and k– ω-shear stress transport (SST) turbulence models. Numerical simulations have been carried out in commercial solver ANSYS FLUENT. Present study compares the results of numerical simulations of flow around a stationary cylinder at Re= 1000. It has been evidently proved from this study, mesh size and skewness not only of the near body elements, but also of those in the far flow field influences the shedding phenomenon, especially the shedding frequency.Chandran VidyaSheeja JanardhananSekar M2018-07-252018-07-2541