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All Journal EMITTER International Journal of Engineering Technology Civil Engineering Dimension
Ilman, Eko Charnius
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Civil Engineering, Building, Construction & Architecture Computer Science & IT

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Numerical Analysis of Wave Load Characteristics on Jack-Up Production Platform Structure Using Modified k-ω SST Turbulence Model Gilang Muhammad; Arini, Nu Rhahida; Ilman, Eko Charnius; Ariwibowo, Teguh Hady
EMITTER International Journal of Engineering Technology Vol 11 No 1 (2023)
Publisher : Politeknik Elektronika Negeri Surabaya (PENS)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24003/emitter.v11i1.806

Abstract

One of the important stages in the offshore structure design process is the evaluation of the marine hydrodynamic load in which the structure operates, this is to ensure an appropriate design and improve the safety of the structure. Therefore, accurate modeling of the marine environment is needed to produce good evaluation data, one of the methods that can accurately model the marine environment is through the Computational Fluid Dynamic (CFD) method. This research aims to analyze the ocean wave load of pressure and force characteristics on the jack-up production platform hull structure using the (CFD) method. The foam-extend 4.0 (the fork of the OpenFOAM) software with waveFoam solver is utilized to predict the free surface flow phenomena as its capability to predict with accurate results. The Reynold Averaged Navier Stokes (RANS) turbulence model of k-ω SST is applied to predict the turbulence effect in the flow field. Five variations of incident wave direction type are carried out to examine its effect on the pressure and force characteristics on the jack-up production platform hull. The wave model shows inaccurate results with the decrease in wave height caused by excessive turbulence in the water surface area. Excessive turbulence levels can be overcome by incorporating density variable and buoyancy terms based on the Standard Gradient Diffusion Hypothesis (SGDH) into the turbulent kinetic energy equation. The k-ω SST Buoyancy turbulence model shows accurate results when verified to predict wave run-up and horizontal force loads on monopile structures. Furthermore, test results of the wave load on the jack-up production platform hull structure shows that the most significant wave load is obtained in variations with the wave arrival direction relatively opposite to the platform wall. Especially in the direction of 90° because it also has the most expansive impact surface area. Meanwhile, the lower wave load is obtained in variations 45° and 135°, which have the relatively oblique direction of wave arrival to the surface.
Impact of Anchor Drag on Subsea Pipeline Integrity: Numerical Study on Crack Propagation and Leakage Arianta, Arianta; Tawekal, Ricky Lukman; Santoso, Jason Filius; Ilman, Eko Charnius
Civil Engineering Dimension Vol. 28 No. 1 (2026): MARCH 2026
Publisher : Institute of Research and Community Outreach - Petra Christian University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.9744/ced.28.1.1-10

Abstract

Anchor drag incidents impacting subsea pipelines lead to structural failure, driven primarily by crack propagation under mechanical stress. This study employs finite element modelling (FEM) and the extended finite element method (XFEM) to evaluate how initial crack dimensions (depth: 4–6 mm; length: 20–60 mm) affect pipeline integrity. Results indicate that pipelines with smaller initial cracks (4 mm depth) resist leakage until an anchor drag distance of 67.839 m, whereas larger cracks (6 mm depth) fail at 33.389 m, emphasizing crack depth as the critical factor in reducing structural resilience. Crack propagation follows a triphasic pattern: slow initiation, rapid acceleration at 25–35 m drag distance, and deceleration near the pipe wall. Larger cracks propagate faster, with 6 mm depth cracks reaching critical failure earlier than smaller defects.
Co-Authors Arianta, Arianta Arini, Nu Rhahida Gilang Muhammad Ricky Lukman Tawekal, Ricky Lukman Santoso, Jason Filius Teguh Hady Ariwibowo