STM JOURNALSScientific Technical Medical

Journal of

Offshore Structure &Technology

Jan - April 2014

(JoOST)

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Industrial Tribology Machine Dynamics & Maintenance

Engineering Centre (ITMMEC)

Indian Institute of Technology Delhi, India.

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Alternative Energy Technology Laboratory,

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Indian Institute of Technology, Chennai, India.

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Applied Chemistry, BIT Mesra,

Patna, India.

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Gargi Asha Jha

Nupur Anand

Priyanka Aswal

Sona Chahal

STM Journal (s) Advisory Board

Dr. Ashish RunthalaLecturer, Biological Sciences Group,

Birla Institute of Technology & Science, Pilani Rajasthan, India.

Dr. Baldev RajDistinguished Scientist & Director,

Indira Gandhi Centre for Atomic Research

(ICGAR)Kalpakkam, India.

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of Civil Engineering National Institute of Technology Trichy, India.

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Metallurgical and Materials Engineering National Institute of Technology,

Rourkela, India.

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AIIMS, New Delhi, India.

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Medicine, Maulana Azad Medical College, New Delhi, India.

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Pune, India.

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University, Baru Sahib, India.

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National Brain Research Centre, Manesar, India.

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Indian Institute of Technology Madras, India.

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Nurture Earth R&D Pvt LtdMIT Campus, Beed bypass road,

Aurangabad, India.

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Department of Applied Chemistry, BIT Mesra, Patna, India.

Dr. Priyavrat TharejaHead, Materials and Metallurgical

Engineering department, PEC University of Technology,

Chandigarh, India.

STM Journal (s) Advisory Board & Editorial Board

Dr. Upendra Singh YadavAssistant Professor , D.I.T University,

Dehradun, India.

Editorial Board

Dr. Ajaykumar Ramdas KambekarAssistant Professor , Department of Civil

Engineering, Sardar Patel College of Engineering, Mumbai , India.

Engr. Habib Zaman MemonLecturerInstitute Of Petroleum & N-Gas Mehran University of Engineering & Technology

Jamshoro, Pakistan.

Dr. N. VishwakarmaAssistant Professor,N.I.T ,Raipur, India.

Dr. Nisith Ranjan MandalDean, SA, Professor, Ocean Engineering &

Naval architecture, Indian Institute of Technology Kharagpur, W. B. , India.

Dr. M. ZeinoddiniAssociate Professor

KNT University of Technology,Tehran, Iran.

Dr. Anitha JosephProfessor, Department of Civil Engineering ,TKM College of

Engineering, Kerala, India.

Dr. Panneer SelvamAssociate Professor

Department of Ocean Engineering, IIT Madras, India.

Dr. Partha BhattacharyaAssociate Professor,Jadavpur University,

Kolkata, India.

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

Dr. RizwanAssistant Professor,Department Of Civil Engineering, Dr B R Ambedkar National

Institute Of Technology Jalandhar, Punjab, India.

Dr. Santosh G. ThampiProfessor, Dept.of Civil Engineering,

NIT Calicut, Kerala, India.

Dr. Sanjeev AnandAssistant Professor, School of Energy Management, Shri Mata Vaishno Devi

University, Jammu & Kashmir, India.

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

Director's Desk

STM JOURNALS

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

2. Integrated Production Modeling an Asset for Designing a Development Program of a Field: A Case Study Rano Soomro, Allah Dino Samoon 12

3. Vortex Shedding Characteristics of Tapered Cylinders at Turbulent WakeVahid Tamimi, Mostafa Zeinoddini, Arash Bakhtiari 25

ContentsJournal of Offshore Structure and Technology

JoOST (2014)© STM Journals 2014. All Rights Reserved

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 R

2*

1Civil and Transport Engineering, Norwegian University of Science Technology, Trondheim, Norway

2Department 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

JoOST (2014)© STM Journals 2014. All Rights Reserved

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

JoOST (2014)© STM Journals 2014. All Rights Reserved

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