Journal of offshore structure and technology (vol1, issue1) by STM Journals Publication

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Offshore Structure & Technology Jan - April 2014

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Dr. Rakesh Kumar

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Prof. Sundara Ramaprabhu

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Dr. Upendra Singh Yadav

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Editorial Board

Dr. Ajaykumar Ramdas Kambekar Assistant Professor , Department of Civil Engineering, Sardar Patel College of Engineering, Mumbai , India.

Dr. Anitha Joseph Professor, Department of Civil Engineering ,TKM College of Engineering, Kerala, India.

Engr. Habib Zaman MemonLecturer Institute Of Petroleum & N-Gas Mehran University of Engineering & Technology Jamshoro, Pakistan.

Dr. M. Zeinoddini Associate Professor KNT University of Technology, Tehran, Iran.

Dr. N. Vishwakarma Assistant Professor,N.I.T ,Raipur, India.

Dr. Nisith Ranjan Mandal Dean, SA, Professor, Ocean Engineering & Naval architecture, Indian Institute of Technology Kharagpur, W. B. , India.

Dr. Panneer Selvam Associate Professor Department of Ocean Engineering, IIT Madras, India.

Dr. Partha Bhattacharya Associate Professor,Jadavpur University, Kolkata, India.

Mr. Rano Soomro Lecturer, Institute of Petroleum and Natural Gas Engineering Mehran UET Jamshoro, Sindh, Pakistan.

Dr. Rizwan Assistant Professor,Department Of Civil Engineering, Dr B R Ambedkar National Institute Of Technology Jalandhar, Punjab, India.

Dr. Santosh G. Thampi Professor, Dept.of Civil Engineering, NIT Calicut, Kerala, India.

Dr. Sanjeev Anand Assistant Professor, School of Energy Management, Shri Mata Vaishno Devi University, Jammu & Kashmir, India.

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STM JOURNALS

I take the privilege to present the print version for the [Volume 1 Issue (1) ] of Journal of Offshore Structure and Technology. The intension of JoOST is to create an atmosphere that stimulates creativeness, research and growth in the area of Offshore Structure and Technology. The development and growth of the mankind is the consequence of brilliant Research done by eminent Scientists and Engineers in every field. JoOST provides an outlet for Research findings and reviews in areas of Offshore Structure and Technology found to be relevant for National and International recent developments & research initiative. The aim and scope of the Journal is to provide an academic medium and an important reference for the advancement and dissemination of Research results that support high level learning, teaching and research in the domain of Offshore Structure and Technology. Finally, and Authors for their continued support and invaluable contributions and suggestions in the form of authoring I express my sincere gratitude and thanks to our Editorial/ Reviewer board write ups/ reviewing and providing constructive comments for the advancement of the journals. With regards to their due continuous support and co-operation, we have been able to publish quality Research/Reviews findings for our customers base. I hope you will enjoy reading this issue and we welcome your feedback on any aspect of the Journal.

Dr. Archana Mehrotra Director STM Journals

Journal of Offshore Structure and Technology

Contents

1. Hydrodynamic Analysis of Deep Drafted Column Structured (DDCS) Floater for an Offshore Wind Turbine Mayilvahanan A.C, Panneer Selvam R

2. Integrated Production Modeling an Asset for Designing a Development Program of a Field: A Case Study Rano Soomro, Allah Dino Samoon

3. Vortex Shedding Characteristics of Tapered Cylinders at Turbulent Wake Vahid Tamimi, Mostafa Zeinoddini, Arash Bakhtiari

Journal of Offshore Structure and Technology Volume 1, Issue 1 www.stmjournals.com

Hydrodynamic Analysis of Deep Drafted Column Structured (DDCS) Floater for an Offshore Wind Turbine Mayilvahanan A.C1, Panneer Selvam R2* 1

Civil and Transport Engineering, Norwegian University of Science Technology, Trondheim, Norway 2 Department of Ocean Engineering, Indian Institute of Technology, Chennai, India

Abstract Power generation from offshore wind turbines is widely seen as a main source of sustainable energy supply in coming decades. As wind speed increases rapidly with distance from the coast, potential sites for extracting the offshore wind energy for the use of coastal community exist in many places. In shallow water, fixed structures like tripods, jackets, and truss-type towers, monopiles and gravity base are functionally and economically feasible for depths up to 60 m. In deep waters, a floating substructure is found to be more economical than a bottom fixed structures. The present study focuses on hydrodynamic behavior of Deep Drafted Column Structured (DDCS) type floater with different aspect ratios for its suitability to support an offshore wind turbine. The responses are obtained in the frequency domain for two cases in three different sea states: the complete system under wave loading only and the complete system under wave and wind loading.

Keywords: wind turbines, DDCS, hydrodynamic, wind energy, water depth

Journal of Offshore Structure and Technology Volume 1, Issue 1 www.stmjournals.com

Integrated Production Modeling an Asset for Designing a Development Program of a Field: A Case Study Rano Soomro*, Allah Dino Samoon Mehran University of Engineering and Technology Abstract Current challenging scenario of environment and technologies causing Oil/Gas industry to focus on designing the development program of a field that is only possible with the help of Integrated Production modeling accurately. Managing the reservoirs through correct modeling can lead to best destinations. IPM provides key understanding of field from reservoir to separator conditions. It can provide best communication between wellbore and surface facilities Hence it can provide best economical visualization of an Oil/Gas field. The compilation is comprised of usage of IPM to design a development program of a field using real field data in order to find best way to produce well economically. Here we have focused on data obtained from a condensate field having PVT, well test, well logs and production history to design a field development program including the transfer of the size and function of the bare model sensitivity analysis, which provides a variety of media stored in the pressure distribution profiles based on both the production and its position through IPM Software. Our focusing criteria were to gather data from a field, summarized it through best methods, run different iterative methods to correct some problems in the field and summarize it. Hence this activity enabled us to come with awareness of different problems effecting overall well performance and their solutions. We have done our best to utilize our skills to design a field development program using software skills.

Keywords: Production, reservoir simulation, sensitivity analysis

Journal of Offshore Structure and Technology Volume 1, Issue 1 www.stmjournals.com

Vortex Shedding Characteristics of Tapered Cylinders at Turbulent Wake Vahid Tamimi*, Mostafa Zeinoddini, Arash Bakhtiari Department of Civil Engineering, K.N.Toosi University of Technology, Tehran, Iran Abstract The physics of flow regime around a tapered cylinder is strongly three-dimensional (3D) and complex. These pose numerical difficulties in capturing the vortex shedding phenomena in the wake of cylinder. This paper discusses the main characteristics of vortex shedding behind a fixed linearly tapered circular cylinder at relatively high Reynolds numbers. A computational fluid dynamics model is employed to solve the 3D incompressible transient Navier-Stokes governing equations. The numerical model is first calibrated/validated against available experimental and Direct Numerical Simulations data for vortex shedding past circular cylinders from other researchers. The calibrated model is then employed to explore vortex shedding characteristics behind a stationary and mildly tapered cylinder. A range of Reynolds number up to 29,000 is considered. The model is able, reasonably well, to simulate key physical vortex shedding characteristics for tapered cylinders. Phenomena such as variation of the shedding frequency along the cylinder span or cellular vortex shedding, vortex dislocations or vortex splitting, oblique vortex shedding, streamwise or longitudinal vortices and the variation of the vorticity patterns along the tapered cylinder are discussed. Lift and drag force coefficients of the tapered cylinder are also presented.

Keywords: Tapered cylinder, cellular and oblique vortex shedding, vortex dislocations, lift and drag forces