Experimental & Analytical Hydrodynamic Behavior Investigation of an Onshore OWC-WEC Imposed to Caspian Sea Wave Conditions 2 2 In this paper, the effect of the draft depth (as a dimensionless number) and characteristics of the incident wave on free surface oscillation, velocity, and the output power of an OWC has been analytically and experimentally investigated. Therefore, the governing equations of hydrodynamic performance inside the oscillating water column chamber were first presented by assuming a mathematical model based on the potential flow theory. Then, a 1:10 single chamber OWC has been experimentally investigated in a wave tank, by considering the Caspian Sea wave characteristics. Comparing the obtained results showed that there is a good agreement between the theoretical solution and experimental test data. According to the results, increasing the frequency of the incident wave increases the free surface oscillation outside the chamber, while the results inside the OWC are different. In other words, under these conditions, free-surface oscillations inside the OWC and subsequently, the velocity and flow rate of the orifice decrease. So, the power generated will decrease too. Also, the effects of draft depth have been theoretically and experimentally analyzed for three depths and turned out that increasing the depth of drafts from 5 to 25 cm and frequency from 32 to 42 rpm causes a decrease in power generation. 1 12 2020/06/28 1399/4/8 2020/09/12 1399/6/22 Behrad Alizadeh Kharkeshi Behrad Alizadeh Kharkeshi Sea-Based Energy Research Group, Babol Noshirvani University of Technology iran b.alizadeh@nit.ac.ir Rouzbeh Shafaghat Rouzbeh Shafaghat Sea-Based Energy Research Group, Babol Noshirvani University of Technology iran rshafaghat@nit.ac.ir Rezvan Alamian Rezvan Alamian Sea-Based Energy Research Group, Babol Noshirvani University of Technology iran ralamian@nit.ac.ir Amir Hossein Aghajani Afghan Amir Hossein Aghajani Afghan Sea-Based Energy Research Group, Babol Noshirvani University of Technology iran amirhosseinaghajani25@gmail.com OWC Device Wave Energy Caspian Sea Experimental Test Wave Effect LÓPEZ, I., ANDREU, J., CEBALLOS, S., DE ALEGRÍA, I. M. and KORTABARRIA, I.,(2013), Review of wave energy technologies and the necessary power-equipment, Renewable and sustainable energy reviews, 27, p. 413-434.##AMIRI, H. A., SHAFAGHAT, R., ALAMIAN, R., TAHERI, S. M. and SHADLOO, M. S.,(2019), Study of horizontal axis tidal turbine performance and investigation on the optimum fixed pitch angle using CFD, International Journal of Numerical Methods for Heat & Fluid Flow.##FALCÃO, A. F., HENRIQUES, J. C., GATO, L. M. and GOMES, R. P.,(2014), Air turbine choice and optimization for floating oscillating-water-column wave energy converter, Ocean Engineering, 75, p. 148-156.##ANTONIO, F. D. O.,(2010), Wave energy utilization: A review of the technologies, Renewable and sustainable energy reviews, 14(3), p. 899-918.##HEATH, T.,(2012), A review of oscillating water columns, Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences, 370(1959), p. 235-245.##GROVE-PALMER, C.,(1982), in Proceedings of the 2nd International Symposium on Wave Energy Utilization. p. 22-24.##FALCÃO, A. F. and HENRIQUES, J. C.,(2016), Oscillating-water-column wave energy converters and air turbines: A review, Renewable Energy, 85, p. 1391-1424.##WHITTAKER, T., MCILWAINE, S. and RAGHUNATHAN, S.,(1993), in Proceedings of First European Wave Energy Symposium. National Engineering Laboratory East Kilbride, p. 283-286.##SUZUKI, M., ARAKAWA, C. and TAKAHASHI, S.,(2004), in The Fourteenth International Offshore and Polar Engineering Conference. International Society of Offshore and Polar Engineers.##SHENG, W., ALCORN, R. and LEWIS, A.,(2013), On thermodynamics in the primary power conversion of oscillating water column wave energy converters, Journal of Renewable and Sustainable Energy, 5(2), p. 023105.##EVANS, D.,(1982), Wave-power absorption by systems of oscillating surface pressure distributions, Journal of Fluid Mechanics, 114, p. 481-499.##WEHAUSEN, J. V. and LAITONE, E. V.,(1960), Encyclopedia of Physics, Vol. IX, Fluid Dynamics III, Springer-Verlag, Berlin.##SARMENTO, A. J. and FALCÃO, A. D. O.,(1985), Wave generation by an oscillating surface-pressure and its application in wave-energy extraction, Journal of Fluid Mechanics, 150, p. 467-485.##JEFFERYS, R. and WHITTAKER, T., (1986), in Hydrodynamics of Ocean Wave-Energy Utilization, Ed^Eds, Springer, p. 281-291.##WEBER, J. and THOMAS, G.,(2001), in The Eleventh International Offshore and Polar Engineering Conference. International Society of Offshore and Polar Engineers.##WANG, D., KATORY, M. and LI, Y.,(2002), Analytical and experimental investigation on the hydrodynamic performance of onshore wave-power devices, Ocean Engineering, 29(8), p. 871-885.##HONG, D., HONG, S. and HONG, S.,(2004), Numerical study on the reverse drift force of floating BBDB wave energy absorbers, Ocean Engineering, 31(10), p. 1257-1294.##SUROSO, A.,(2005), Hydraulic model test of wave energy conversion, Jurnal Mekanikal, (19), p. 84-94.##NAGATA, S., et al.,(2011), in Proceedings of the 9th European Wave and Tidal Energy Conference. p. 5-9.##ŞENTÜRK, U. and ÖZDAMAR, A.,(2012), Wave energy extraction by an oscillating water column with a gap on the fully submerged front wall, Applied Ocean Research, 37, p. 174-182.##MALARA, G. and ARENA, F.,(2013), Analytical modelling of an U-Oscillating Water Column and performance in random waves, Renewable Energy, 60, p. 116-126.##CASHMAN, D. P., O'SULLIVAN, D. L., EGAN, M. G. and HAYES, J. G.,(2009), in Proceedings of 8th European Wave and Tidal Energy Conference. p. 924-933.##KAMATH, A., BIHS, H. and ARNTSEN, Ø. A.,(2015), Numerical modeling of power take-off damping in an oscillating water column device, International Journal of Marine Energy, 10, p. 1-16.##NING, D.-Z., WANG, R.-Q., ZOU, Q.-P. and TENG, B.,(2016), An experimental investigation of hydrodynamics of a fixed OWC Wave Energy Converter, Applied energy, 168, p. 636-648.##CHANG, C.-Y., CHOU, F. N.-F., CHEN, Y.-Y., HSIEH, Y.-C. and CHANG, C.-T.,(2016), Analytical and experimental investigation of hydrodynamic performance and chamber optimization of oscillating water column system, Energy, 113, p. 597-614.##ÇELIK, A. and ALTUNKAYNAK, A.,(2018), Experimental and analytical investigation on chamber water surface fluctuations and motion behaviours of water column type wave energy converter, Ocean Engineering, 150, p. 209-220.##ALAMIAN, R., SHAFAGHAT, R., HOSSEINI, S. S. and ZAINALI, A.,(2017), Wave energy potential along the southern coast of the Caspian Sea, International Journal of Marine Energy, 19, p. 221-234.##ALAMIAN, R., SHAFAGHAT, R. and SAFAEI, M. R.,(2019), Multi-objective optimization of a pitch point absorber wave energy converter, Water, 11(5), p. 969.##ALAMIAN, R., SHAFAGHAT, R., MIRI, S. J., YAZDANSHENAS, N. and SHAKERI, M.,(2014), Evaluation of technologies for harvesting wave energy in Caspian Sea, Renewable and sustainable energy reviews, 32, p. 468-476.##DEAN, R. G. and DALRYMPLE, R. A.,(1991), Water wave mechanics for engineers and scientists, World Scientific Publishing Company, vol. 2.##SHALBY, M., WALKER, P. and DORRELL, D. G.,(2016), in 2016 IEEE International Conference on Renewable Energy Research and Applications (ICRERA). IEEE, p. 183-188.##SHALBY, M., WALKER, P. and DORRELL, D. G.,(2017), Modelling of the multi-chamber oscillating water column in regular waves at model scale, Energy Procedia, 136, p. 316-322.##EBRAHIMPOUR, M., SHAFAGHAT, R., ALAMIAN, R. and SAFDARI SHADLOO, M.,(2019), Numerical investigation of the savonius vertical axis wind turbine and evaluation of the effect of the overlap parameter in both horizontal and vertical directions on its performance, Symmetry, 11(6), p. 821.## ##

Numerical Assessment of Tight-Fit Sleeve Clamp in the Repair Process of Cracked Submarine Pipelines 2 2 The present research addresses the crack arrest in the submarine pipeline under internal pressure, axial force, and bending moment. The main purpose of the research is to consider tight-fit sleeves as a solution to crack arrest. The stress intensity factor criteria are used to describe the crack behavior. It should be noted that the cracks examined here are inclined through-thickness cracks, which the ABAQUS commercial software used to simulate them. It's noteworthy that Mode I fracture is dealt with, and the other fracture modes are omitted. The results show that the tight-fit sleeves, preferentially arrest the inclined cracks; so that the amounts of the stress intensity factors decrease for all the cracks except for the circumferential cracks to the extent that they become closed. As a result, their growth stops in practice; however, it best reduces the stress intensity factors by up to 65.36% at the circumferential cracks, and their amounts remain non-negative. Tight-fit sleeves create a pressurized region around the inclined cracks. This causes that inclined cracks remain closed. 13 20 2020/06/282020/02/17 1398/11/28 2020/09/122020/09/16 1399/6/26 Seyed Mohammad Hossein Sharifi Seyed Mohammad Hossein Sharifi Department of Mechanical Engineering, Petroleum University of Technology iran sharifi@put.ac.ir Pedram Edalat Pedram Edalat Department of Mechanical Engineering, Petroleum University of Technology iran edalat@put.ac.ir Babak Najafi Babak Najafi Iranian Offshore Oil Company (IOOC) iran babak.najafi.s@gmail.com Masoud Bolfakeh Masoud Bolfakeh Petroleum University of Technology iran masoudbolfakeh@gmail.com Crack arrest Stress intensity factors Inclined cracks Tight-fit sleeve Submarine pipelines F. Van den Abeele and M. Di Biagio, "Design of crack arresters for ultra high grade gas transmission pipe-lines material selection, testing and modeling," Int. J. Sustain. Constr. Des., vol. 2, no. 2, pp. 296-306, 2011.##M. Ali Ghaffari and H. Hosseini-Toudeshky, "Fatigue Crack Propagation Analysis of Repaired Pipes With Composite Patch Under Cyclic Pressure," J. Press. Vessel Technol., vol. 135, no. 3, p. 031402, May 2013.##F. Benyahia, A. Albedah, and B. Bachir Bouiadjra, "Stress Intensity Factor for Repaired Circumferential Cracks in Pipe With Bonded Composite Wrap," J. Press. Vessel Technol., vol. 136, no. 4, p. 41201, Apr. 2014.##M. Meriem-Benziane, S. A. Abdul-Wahab, H. Zahloul, B. Babaziane, M. Hadj-Meliani, and G. Pluvinage, "Finite element analysis of the integrity of an API X65 pipeline with a longitudinal crack repaired with single-and double-bonded composites," Compos. Part B Eng., vol. 77, pp. 431-439, Aug. 2015.##A. Achour, A. Albedah, F. Benyahia, B. A. B. Bouiadjra, and D. Ouinas, "Analysis of Repaired Cracks With Bonded Composite Wrap in Pipes Under Bending," J. Press. Vessel Technol., vol. 138, no. 6, p. 060909, Jul. 2016.##H. Zarrinzadeh, M. Z. Kabir, and A. Deylami, "Experimental and numerical fatigue crack growth of an aluminium pipe repaired by composite patch," Eng. Struct., vol. 133, pp. 24-32, Feb. 2017.##G. Rashed, H. Eskandari, and A. Savari, "Investigating the Effectiveness of a Composite Patch on Repairing Pipes Subjected to Circumferential Cracks under Combined Loadings," Iran. J. Oil Gas Sci. Technol., vol. 8, no. 2, pp. 92-105, 2019.##T. L. Anderson, Fracture Mechanics: Fundamentals and Applications, 4th Editio. Boca Raton: CRC Press, 2017.##G. D. and T.Seelig, Fracture Mechanics: With an Introduction to Micromechanics. Berlin, Heidelberg: Springer Berlin Heidelberg, 2006.##M. C. Walters, G. H. Paulino, and R. H. Dodds, "Interaction integral procedures for 3-D curved cracks including surface tractions," Engineering Fracture Mechanics, vol. 72, no. 11. pp. 1635-1663, 2005.##C. F. Shih, B. Moran, and T. Nakamura, "Energy release rate along a three-dimensional crack front in a thermally stressed body," International Journal of Fracture, vol. 30, no. 2. pp. 79-102, 1986.##D. Bowness and M. M. K. Lee, "The development of an accurate model for the fatigue assessment of doubly curved cracks in tubular joints," International Journal of Fracture, vol. 73, no. 2. pp. 129-147, 1995.##C. F. Shih and R. J. Asaro, "Elastic-plastic analysis of cracks on bimaterial interfaces: part I-small scale yielding," J. Appl. Mech., vol. 55, pp. 299-316, 1988.##ABAQUS Version 6.14-1, "Dassault Systémes Simulia Corp," Providence, RI. 2014.##R. S. Barsoum, "On the use of isoparametric finite elements in linear fracture mechanics," Int. J. Numer. Methods Eng., vol. 10, no. 1, pp. 25-37, Nov. 1976.##J. E. Akin, "The generation of elements with singularities," Int. J. Numer. Methods Eng., vol. 10, no. 6, pp. 1249-1259, 1976.##E. E. Gdoutos, Solid mechanics and its applications, 2nd editio. Springer, 1996.## ##

Progressive Collapse Analysis of a Composite Ship Hull Girder under Vertical Bending using Finite Element Method 2 2 This paper presents the collapse behaviour of a composite ship hull girder under vertical bending. Finite element method is used to provide valuable information regarding moment-curvature relationships and progressive failure characteristics of the composite ship hull girder. The analysis is carried out using ANSYS 12.0 finite element software. The response of the structure to the incrementally-increased sagging and hogging bending moments has been implemented and studied. 21 32 2020/06/282020/02/172019/11/5 1398/8/14 2020/09/122020/09/162020/09/29 1399/7/8 Sepideh Jafarzadeh Sepideh Jafarzadeh Department of Maritime Engineering, Amirkabir University of Technology iran sepideh.jafarzadeh@ntnu.no Mohammad Reza Khedmati Mohammad Reza Khedmati Department of Maritime Engineering, Amirkabir University of Technology iran khedmati@aut.ac.ir Composite ship hull girder Vertical bending Progressive failure Ultimate strength Finite Element Method (FEM)‎. Caldwell, J.B., (1965), Ultimate longitudinal strength. Trans RINA; 207:411-430.##Smith, C.S., (1977), Influence of local compressive failure on ultimate longitudinal strength of a ship's hull. In: Proc Int Symp on Practical Design in Shipbuilding, Tokyo, Japan, p. 73-9.##Khedmati, M.R., (2005), Simulation of average stress average strain relationship of ship unstiffened /stiffened plates subject to in plane compression. Scientia Iranica; 12 (4): 359-367.##Mackney, M.D.A., Rose, C.T.F., (1999), Preliminary ship design using one-and two-dimensional models. Marine Technology; 36(2):102-111.##Naar, H., Varsta, P., Kujala, P., (2004), A theory of coupled beams for strength assessment of passenger ships. Marine Structures; 17(8):590-611.##Chen, N.Z., Sun, H.H., Guedes Soares, C., (2003), Reliability analysis of a ship hull in composite material. Composite Structures; 62(1):59-66.##Chen, N.Z., Guedes Soares, C., (2007), Longitudinal strength analysis of ship hulls of composite materials under sagging moments. Composite Structures; 77(1):36-44.##Chen, N.Z., Guedes Soares, C., (2007), Reliability analysis of ship hulls made of composite materials under sagging moments. Journal of Marine Science and Technology; 12(4):263-271.##Chen, N.Z., Guedes Soares, C., (2008), Ultimate longitudinal strength of ship hulls of composite materials. Journal of Ship Research; 52(3):184-193.##Morshedsolouk, F., Khedmati, M.R., (2016), Ultimate strength of composite ships' hull girders in the presence of composite superstructures. Thin-Walled Structures; 102:122-138.##Morshedsolouk, F., Khedmati, M.R., (2011), An extension of coupled beam method and its application to study ship's hull-superstructure interaction problems. Latin American Journal of Solids and Structure; 8(3):265-290.##Zhang, X., Huang, L., Zhu, L., Tang, Y., and Wang, A., (2017), Ultimate longitudinal strength of composite ship hulls. Curved and Layered Structures; 4(1):158-166.##Swanson Analysis Systems Inc., ANSYS user's manual (Version 12.0). Houston.##Hughes, O.F., Paik, J.K., (2010), Ship Structural Analysis and Design. The Society of Naval Architects and Marine Engineers (SNAME), USA.##Jafarzadeh, S., (2011), Modelling and evaluation of ultimate strength of composite ships using finite element method. MSc Thesis (supervised by Dr. Mohammad Reza Khedmati), Amirkabir University of Technology, Tehran, Iran.## ##

Numerical modeling of sediment transport patterns under the effects of waves and tidal currents at Pars port complex inlet 2 2 This study aimed to investigate the sedimentation mechanism at Pars port complex inlet (petrochemical and services ports in Iran) under the effects of wind-waves and tidal currents and to provide solutions to reduce sedimentation by changing the port plan. For this purpose, at first, the modeling of changes in water level and tidal currents in the area was conducted. The results for the currents and waves were evaluated and validated using the measured field data. The one-dimensional sediment transport potential was calculated by about 33,000 cubic meters per year. The analysis of two-dimensional sediment transport phenomena within the ports and inlets showed that tidal currents patterns that are parallel to the coast and the waves in the region are the most important factors in sedimentation. Accordingly, to minimize sedimentation and to investigate the effect of the geometric shape of the port, three configurations were proposed for ports, and the patterns of sedimentation were evaluated in the new arrangements. 33 40 2020/06/282020/02/172019/11/52020/05/25 1399/3/5 2020/09/122020/09/162020/09/292020/11/25 1399/9/5 Ali Zeinabi Ali Zeinabi Persian Gulf University iran alizeyzar@yahoo.com Ahmadreza Kohansal Ahmadreza Kohansal Persian Gulf University iran kohansal@pgu.ac.ir Sediment Transport Waves Tidal Currents Geometry Shape of Ports Pars Ports Amromin, E., Kovinskaya, S., (2003), Numerical simulation of sediment transport in harbors, Ocean engineering, 30: 1869-1885.##Babu, M.T., Vethamony, P., Desa, E., (2005), Modelling tide-driven currents and residual eddies in the Gulf of Kachchh and their seasonal variability: A marine environmental planning perspective, Ecological modelling, 184: 299-312.##Yüksek, Ö., (1995), Effects of breakwater parameters on shoaling of fishery harbors, Journal of waterway, port, coastal, and ocean engineering, 121: 13-22.##Yin J, Falconer RA, Chen Y, Probert SD, (2000), Water and sediment movements in harbors, Applied energy, 67: 341-352.##Van Maren, D.S., Winterwerp, J.C., Sas, M., Vanlede, J., (2009), The effect of dock length on harbor siltation, Continental Shelf Research, 29: 1410-1425,.##Panigrahi, J.K., Ananth, P.N., Umesh, P.A., (2009), Coastal morphological modeling to assess the dynamics of Arklow Bank, Ireland, International Journal of Sediment Research, 24: 299-314.##Leite, L.M., Dias, J.M., Carvalho, J.M.B., Klein, A.H.F., (2011), Hydrodynamic study of bay beaches-a case study of Itapocorói Bay, Brazil. Journal of Coastal Research, 1086-1090.##Nakagawa, Y., Nadaoka, K., Yagi, H., Ariji, R., Yoneyama, H., Shirai. K., (2012), Field measurement and modeling of near-bed sediment transport processes with fluid mud layer in Tokyo Bay, Ocean Dynamics, 62: 1535-1544.##Google In. c., (2015), Satellite imagery from Google Pro,.##Smagorinsky, J., (1963), General circulation experiments with the primitive equations: I. the basic experiment, Monthly weather review, 91: 99-164.##https://doi.org/10.1175/1520-0493(1963)0912.3.CO;2##Manual, S.P., (1984), Coastal Engineering Research Center. Department of the Army, Waterways Experiment Station, 1.##MIKE21Flow Model FM, (2012), Spectral Wave Module, User Guide, DHI Software.##Booij, N., Haagsma, I.J.G., Holthuijsen, L.H., Kieftenburg, A.T.M.M., Ris, R.C., Van Der Westhuysen, A.J., Zijlema, M., (2004), SWaN cycle III version 40.41 user manual. Delft University of Technology, 115.##Battjes, J.A., Janssen, J.P.F.M., (1978), Energy loss and set-up due to breaking of random waves, Coastal Engineering Proceedings, 1.##Kamphuis, J.W., (1991), Alongshore sediment transport rate, Journal of Waterway, Port, Coastal, and Ocean Engineering, 117: 624-640.##Engelund, F., Hansen, E., (1967), A monograph on sediment transport in alluvial channels, Teknik Forlag, Copenhagen, 293-306.## ##

Investigation of Available Configurations for Flexible Risers in Shallow Water 2 2 Flexible risers have been used widely in recent years for floating structure in shallow and deep water. Flexible risers have various configurations and each configuration has its specific charectresitics that helps the riser to solve the problems that exist in shallow and deep water. Selecting and designing the best configuration for flexible risers in shallow water, like deep water, present many challenges, some of these challenges can be addressed: high vessel displacement compared to the water depth, minimum riser clearance with the seabed or sea surface or the vessel keel, bending radius limitation and etc. The aim of this paper is to investigate the traditional configurations like lazy wave and pliant wave and to compare them with a new configuration like weight added wave for the riser with 15 inches internal diameter in 45m water depth connected to a turret moored floating storage unit. It is concluded that the traditional configuration can not solve the sea surface clearance problem when the riser is empty condition, in this condition the weight of riser is decreased and the buoyancy force is become higher than riser weight and lift the riser up and the riser become flooded on the sea surface. To preventing the riser from flooding on the sea surface it’s needed to use configuration with added mass. Also concluded that using added mass in touch down zone (TDZ) reduces the tension in PLEM connection point about 89% . Also concluded that the minimum bending radius for weight added wave configuration is increased about 29% in compared with traditional configurations. 41 50 2020/06/282020/02/172019/11/52020/05/252020/06/10 1399/3/21 2020/09/122020/09/162020/09/292020/11/252020/12/23 1399/10/3 Seyed Mohammad Hossein Sharifi Seyed Mohammad Hossein Sharifi Faculty of Mechanical Engineering, Petroleum University of Technology iran sharifi@put.ac.ir Nima Pirali Nima Pirali Petroleum University of Technology, Abadan, Iran iran n.pirali@mnc.put.ac.ir Babak Najafi Babak Najafi Iranian offshore oil co. (I.O.O.C.) iran babak.najafi.s@gmail.com Flexible riser Configurations Shallow water FSU Z. Tan, C. Loper, Y. Hou, and T. Sheldrake, "Application of Flexible Risers in Shallow Water: Weight Added Wave Configuration," ASME 2009 28th Int. Conf. Ocean. Offshore Arct. Eng., pp. 373-380, 2009.##H. T. Kim and O. M. O'Reilly, "Instability of catenary-type flexible risers conveying fluid in subsea environments," Ocean Eng., vol. 173, pp. 98-115, 2019.##sadjad karegar, "MASTER ' S THESIS Flexible Riser Global Analysis for Very Shallow Water," 2013.##F. Gray, "Flexible and Rigid Pipe Solutions in the Development of Ultra-Deepwater Fields," 22nd Int. Conf. Offshore Mech. Arct. Eng., pp. 1-15, 2016.##Y. Zhang, "A Study For Worst Periods And Load Cases Selection In Dynamic Analysis Of Flexible Riser," pp. 1-8, 2017.##D. H. A. Berton, "Challenges And Soloution For Deepwater Flexible Risers In The Asian Regions," petromin Deep. subsea Technol. Conf, vol. 5, 2007.##X. Li, H. Ji, B. Zhang, T. Liu, and W. Ye, "Design of Flexible Riser for FPSO in South China Sea," Isope-2016, pp. 109-116, 2016.##N. Ismail, R. Nielsen, M. Kanarellis, and W. Corporation, "Design Considerations for Selection of Flexible Riser Configuration," vol. 42, no. 2, pp. 1-14, 1992.##D. Hanonge and A. Luppi, "Challenges of flexible Riser Systems in Shallow Waters," Proc. Annu. Offshore Technol. Conf., vol. 2, no. May, pp. 1101-1114, 2010.##Y. Hou, J. Yuan, Z. Tan, and J. Witz, "Application of an Enhanced Lazy Wave Flexible Riser System in Extreme Shallow Water With an External Turret Moored FPSO," Proc. Annu. Offshore Technol. Conf., vol. 2019-May, pp. 1-8, 2019.##A. Gurung, P. Viana, A. O'Brien, and A. Rimmer, "Use of Stabilisation Chains to Optimise Lazy Wave Flexible Risers in Harsh Environments," Soc. Pet. Eng. - SPE Offshore Eur. Conf. Exhib. OE 2015, 2015.##"API Spec 17J Specification for Unbonded Flexible Pipe," 1997.##"API Spec 17B Recommended practice for flexible pipe," 1998.##Orcina, "OrcaFlex Manual Version 9.7a." .##K. Jiang, Y. Lu, and Y. Bai, "A theoretical method to estimate the fatigue life of tensile armors of flexible pipes," Proc. Int. Conf. Offshore Mech. Arct. Eng. - OMAE, vol. 5, pp. 1-11, 2018.##"ISO 13628-11 Petroleum and natural gas industrie Design and operation of subsea production systems- Flexible pipe systems for subsea and marine applications."##Y. Zhang, Z. Tan, and Y. Hou, "Design Analysis OF a Weight Added Wave Configuration OF a Flexible Riser In Shallow Water," OMAE2010-20360, pp. 1-8, 2017.## ##

Evaluation of environmental parameters in Floatover installation in mating stage using Design of Experiment methods 2 2 This paper appraises the environmental parameters affecting the Floatover installation method. While this method demands extensive logistics, hardware, and planning from the first stage till the last, Environmental parameters are the main sources of creating external forces. Comprehension of the environmental features and their influence plays a significant role. In this paper, the application of the Design of experiments (DoE) in the offshore installation is examined. This methodology involves the mathematical procedures of designing experiments that allow a precise and effective evaluation of response features using the least number of analyses. By using response surface methodology and Taguchi design, which are methods of DoE, the significance of each parameter is assessed and a function is developed that holds the response with respect to the input environmental parameters. The magnitude of the impact forces acting on the leg mating unit is chosen as the response. Hydrodynamic time domain analysis based on these methods was done. This study was performed for a semi heavy weight topside and a typical T-shaped barge with six degrees of freedom for the Persian Gulf region. 51 61 2020/06/282020/02/172019/11/52020/05/252020/06/102020/06/30 1399/4/10 2020/09/122020/09/162020/09/292020/11/252020/12/232020/12/23 1399/10/3 Erfan Arabshahy Erfan Arabshahy Islamic Azad University, Science and Research Branch, Tehran iran erfanarabshahy@gmail.com Mohammad Kasaeyan Mohammad Kasaeyan Islamic Azad University, Science and Research Branch, Tehran iran kasaeyan.m@gmail.com Naser Shabakhty Naser Shabakhty Iran University of Science and Technology iran shabakhty@iust.ac.ir Floatover Offshore Installation Design of Experiments Response Surface Methodology Taguchi Method Leg Mating Unit JUNG, J.-J., LEE, W.-S., SHIN, H.-S. and KIM, Y.-H., (2009), Evaluating the Impact Load On the Offshore Platform During Float-over Topside Installation, The Nineteenth International Offshore and Polar Engineering Conference, Japan, 2009.##APOS, NEILL, L. 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