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Soroban grid 기반 CIP법을 이용한 자유표면 유동해석
임효남(H.N. Im) 한국전산유체공학회 2010 한국전산유체공학회 학술대회논문집 Vol.2010 No.5
In this study, we provide a comprehensive review of the CIP(Constrained Interpolation Profile/Cubic Interpolated Propagation) method with a pressure-based algorithm that is known as a general numerical solver for soled liquid, gas and plasmas. And also we introduce a body-fitted grid system(Soroban grid) for computation of strongly nonlinear marine hydrodynamic problems such as slamming water on deck, wave impact by green water. This grid system can keep the third-order accuracy in time and space with the help of the CIP method. The grid system consists of the straight lines and grid points. In the 2-dimensional grid case, each grid points moving in these lines like abacus - Soroban in Japanese. The length of each line can be different and the number of grid points in each line can be different. Mesh generation and searching of upstream departure point are very simple and possible to mesh-free treatment. To optimize computation of free-surface and multi-fluid flows, We adopt the C-CUP method. In most of the earlier computations, the C-CUP method was used with a staggered-grid approach. Here, because of the mesh free nature of the Soroban grid, we use the C-CUP method with a collocated-grid approach.
임효남(H.N Im) 한국전산유체공학회 2011 한국전산유체공학회 학술대회논문집 Vol.2011 No.5
In this study, it is performed numerical simulation on multi-phase flow by means of CIP-CSL2 scheme. It is applied to a two-phase free surface flow problem at a high density ratio equivalent to that of an air-water system, for examining the computational capability. The method that is being developed and improved is a CIP(Constrained Interpolation Profile) and CSL2(Conservative Semi-Lagrangian) based Cartesian Grid Method.
FPSO 운동을 고려한 3상 세퍼레이터의 내부유동 해석
임효남(H.N. Im),이희웅(H.W. Lee) 한국전산유체공학회 2013 한국전산유체공학회 학술대회논문집 Vol.2013 No.5
A floating production, storage and offloading(FPSO) unit is a facility for developing oil and gas found under the ocean for the processing of hydrocarbons and for storage of oil. The separators are FPSO topside facilities designed to separate a measure water, gas and oil rate. This paper will explore the possibilities of utilising CFD techniques on the three-phase separator design with FPSO motion. The influence of baffle and weir arrangement has been studied with CFD simulations including motion mitigation. The research would show the flow patterns inside the three phase separator for the typical shaped of baffle by using CFD analysis.
FPSO용 탑사이드 세퍼레이터의 내부 유동에 대한 수치적 연구
이희웅(H.W. Lee),서종무(J.M. Sur),임효남(H.N. Im) 한국전산유체공학회 2012 한국전산유체공학회 학술대회논문집 Vol.2012 No.11
A floating production, storage and offloading (FPSO) is a floating vessel used by the offshore oil and gas industry for the processing of hydrocarbons and for storage of oil. The separators are FPSO topside facilities designed to separate a measure water, gas and oil rates. The separators are equipment with internal components such as inlet device, vane pack, coalescer, wave breaker, weir plates and mist extractor that facilitate and improve the separation of phases. The inlet device distributes well stream composed of water, gas and oil at the separator inlet to make calm and even flow for the improvement of separation efficiency. This research would show the flow patterns inside the 3-phase separator for the typical shapes of inlet device by using CFD analysis.
이인수(I.S. Lee),임효남(H.N. Im),최재웅(J.W. Choi) 한국전산유체공학회 2011 한국전산유체공학회 학술대회논문집 Vol.2011 No.5
The purpose of this sutdy is to evaluate a defrost model for the possibility of defrosting on wheelhouse window and the heat apacity of defrosting nozzle by using the commercial CFD solver FLUENT. A detailed simulation model has been created which contains the defrosting nozzle, window and the interior/exterior forced convection boundary. In this numerical study, the heat and mass transfer coupled during defrosting and investigated the defrost time for different hot gas temperature, external wind speed and temperature condition.
FPSO용 3상 세퍼레이터의 Mist Eliminator 성능평가에 대한 연구
서종무(J.M. Sur),이희웅(H.W. Lee),임효남(H.N. Im) 한국전산유체공학회 2012 한국전산유체공학회 학술대회논문집 Vol.2012 No.11
Wire mesh mist eliminator is widely used in various industrial fields, such as crude oil production plants and chemical process plants, specifically on gas scrubbers, packed towers and 3-phase separators, for the purpose to remove floating liquid droplets in the gas. The wide utilization of the wire mesh mist eliminator is due to the low-cost and high separation efficiency. However, despite of the wide applications of the wire mesh mist eliminator, design and performance validation cases using computational fluid dynamics are very limited. Heretofore, wire mesh mist eliminator design has been performed based on semi-empirical equations, and performance is validated through high-cost experiments. On this study, a method to evaluate the performance of a wire mesh mist eliminator which will be applied to the FPSO (Floating, Production, Storage, and Offloading) topside 3-phase separator by using two-dimensional computational fluid dynamics has been suggested to replace the high-cost experiments. To verify the suggested method, a comparison between the performance analysis using computational fluid dynamics, semi-empirical equation, and experiments has been performed with a specific wire mesh mist eliminator model.