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CEL기법을 이용한 앵커 끌림 시뮬레이션에 의한 Rock-berm 설계
신문범(Mun-Beom Shin),박동수(Dong-Su Park),서영교(Young-kyo Seo) 한국해양공학회 2017 韓國海洋工學會誌 Vol.31 No.6
In this study, an anchor dragging simulation was performed using the CEL method to design a rock-berm, which is a protection method for submarine cables. In order to simulate an anchor drag, preliminary simulations were first performed to determine the initial anchor penetration depth, anchor drag velocity, drag angle, and distance between the anchor and rock-berm. Based on the preceding simulation results, a safe rock-berm design for protecting the submarine cables was simulated to calculate the anchor penetration depth by the anchor dragging. As a result, the penetration depth of the anchor was found to be shallower in a hard seabed, and the penetration depth was deeper in a soft seabed. , the height of the rock-berm was determined according to the physical properties of the seabed.
해저지반 성질과 매설깊이 변화에 따른 해저파이프의 충돌 특성
신문범(Mun-Beom Shin),서영교(Young-kyo Seo) 한국해양공학회 2017 韓國海洋工學會誌 Vol.31 No.3
In this study, the impact characteristics of subsea pipelines that were installed in various soil types and burial depths were evaluated by a numerical method. An impact scenario replicated a dropped ship anchor that fell vertically and impacted an installed subsea pipeline. In order to calculate the impact force through terminal velocity, FLUENT, a computational fluid dynamic program and MDM (Moving Deforming Mesh) technique were applied. Next, a dynamic finite element program, ANSYS Explicit Dynamics, was used for impact analysis between the anchor and pipeline (or, subsea if they were buried). Three soil types were considered: loose sand, dense sand and soft clay by applying the Mohr-coulomb model to the seabed. The buried depth was assumed to be 0 m, 1 m and 2 m. In conclusion, a subsea pipeline was the most stable when buried in dense sand at a depth of 2 m to prevent impact damage.
다층 지반의 열전도율을 고려한 해저배관의 총괄열전달계수식 제안
박동수(Dong-Su Park),신문범(Mun-Beom Shin),서영교(Young-Kyo Seo) 한국해양공학회 2018 韓國海洋工學會誌 Vol.32 No.2
Subsea pipelines are designed to transport mixtures of oil, gas, and their associated impurities from a wellhead that can be in excess of approximately 100 °C, while the external temperature may be approximately 5 °C. Heat can be lost from a subsea pipeline containing a high-temperature fluid to the surrounding environment. It is important that the pipeline be designed to ensure that the heat loss is small enough to maintain sufficient flow from the unwanted deposition of hydrate and wax, which occurs at a critical temperature of about 40 °C. Therefore, it is essential to estimate the heat loss of a subsea pipeline in various circumstances. In previous studies, overall heat transfer coefficient(OHTC) formulas were considered only for a single soil type. Thus, it is difficult to characterize the OHTC of the actual seabed with multiple soil layers. In this paper, an OHTC formula that considers multi-layered soils is proposed for more precise OHTC estimation.