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옥외 온열환경 평가를 위한 복사 연성 CFD 해석기법의 개요
임종연(Lim Jong-Yeon),장현재(Chang Hyun-Jae),송두삼(Song Doo-sam) 한국태양에너지학회 2009 한국태양에너지학회 논문집 Vol.29 No.6
Deterioration of the outdoor thermal environment in urban areas has become worse and worse due to the urbanization and overpopulation, etc. Most of existing researches about thermal environment are focused on the indoor environment in which the radiation heat exchange is relatively constant. However, the outdoor thermal environment is changed with time passages, because the thermal environment is highly effected by solar radiation. Thus, to simulate the outdoor thermal environment with accuracy, the solar radiation calculation should be considered, and the radiation heat exchange between building surface and ground surface should be calculated. The purpose of this study is to develop the simulator that can be possible to evaluate the outdoor thermal environment and pedestrian thermal comfort. In this paper, a new method which is coupled with convective heat transfer simulation and radiative heat transfer simulation will be proposed. And the coupled simulation method will be described through case study for outdoor thermal environment. From the results of simulation, the coupled simulation proposed in this study can assess the outdoor thermal environment with accuracy.
對流, 輻射, 濕氣輸送과 空調시스템 制御의 連成解析에 관한 硏究 ― PMV 一定條件에서의 室內空調負荷解析과 應用―
金泰延,加藤信介,村上周三 대한건축학회 2002 대한건축학회논문집 Vol.18 No.8
A CFD (Computational Fluid Dynamics) simulation for analyzing indoor cooling/heating load is presented in this study. It is coupled with a radiative heat transfer simulation and HVAC (Heating, Ventilating, and Air-Conditioning) control system in a room. This new method feeds back the outputs of the HVAC system control to the input boundary conditions of the CFD, and this method includes a human model to evaluate the thermal environment. It would be used to analyze the heating/cooling loads of different HVAC systems under the condition of the same human thermal sensation (e.g. PMV, Operative Temperature, etc.) even though the temperature and air-velocity distribution in the room are different from each other.To examine the performance of the new method, a cooling load and a thermal environment within a semi-enclosed space, which opens into an atrium space, is analyzed under the steady-state conditions during the summer season. This method is able to analyze the indoor cooling load with changes of target thermal environments of a room considering the temperature and the air-velocity distribution in the room. In this paper, two types of HVAC system are compared; i.e. radiation-panel system and all-air cooling system. The radiation-panel cooling system is found to be more energy-efficient for cooling the semi-enclosed space. Changes of the level of thermal environment reduce cooling load effectively in case of the all-air cooling system while the radiation-panel system does not reduce cooling load even though the targeted thermal condition is relaxed.
김혜민,오승재,왕세명 한국소음진동공학회 2015 한국소음진동공학회 학술대회논문집 Vol.2015 No.4
Clarinet is playing by vibrating single reed in the mouthpiece. The reed is used after some polishing steps of reed. Well-trimmed reed has an effect on comfortable playing with technique to clarinetist including playing tones of clarinet. In this research, combination model is designed to predict specific tones of clarinet as a previous step to search the influence on the reed characteristics from the reed polishing. Coupling analysis was simulated in the time domain with input impedance of clarinet duct, characteristics of reed motion and flow in the reed valve.
진영지,김태훈 한국방재학회 2014 한국방재학회논문집 Vol.14 No.4
It is critical to predict the behaviors of between the group-pile foundations and superstructures during large magnitude of earthquakes. In this research, 3D numerical analysis of real-scale group-pile foundation subjected to horizontal cyclic loading is conducted by usingDBLEAVES. In numerical analysis, nonlinear behaviors of between ground and piles are predicted through cyclic mobility model andaxial force dependent model(AFD model), respectively. This research is objected to prove availability of the analysis method by comparingnumerical results and field test results. 지진발생시 군말뚝기초와 상부구조물이 큰 영향을 받는 것으로 알려져 있어, 지진시 말뚝기초의 역학적 거동을 파악하는 것은 중요하다. 본 연구에서는 9개의 파일로 구성된 실물 크기 군말뚝기초의 반복수평하중재하실험 결과를 대상으로 수치해석 프로그램인DBLEAVES를 이용하여 3차원의 유한요소해석을 수행하였다. 지반은 cyclic mobility 모델로, 말뚝은 AFD 모델을 이용하여 계산하였으며, 수치해석 결과를 실험결과와 비교함으로써 해석방법의 유용성을 검토하는데 본 연구의 목적이 있다.
케이블-수중 예인체 시스템의 3차원 비선형 완전 연성해석
고광수(Gwangsoo Go),이은택(Euntaek Lee ),안형택(Hyung Taek Ahn) 한국해양공학회 2016 韓國海洋工學會誌 Vol.30 No.6
In this paper, a strongly coupled method for investigating the interaction between a cable and tow-fish is presented. The nodal position finite element method was utilized to analyze the nonlinear cable dynamics, and 6DOF equations of motion were employed to describe the 3D rigid body motion of the tow-fish. Combining cable and tow-fish systems into a single formulation allowed the two nonlinear systems to be strongly coupled into a unified nonlinear system. This strongly coupled system was numerically integrated in the time domain using a predictor/multi-corrector Newmark algorithm. To demonstrate the validity, efficacy, and applicability of the current approach, two different scenarios (virtual and sea trial) were simulated, and the simulation results were validated using the physical plausibility and the sea trial test.
연성해석을 통한 열파퍼 플라즈마 챔버의 아크현상 이력에 관한 연구
이종철(Jong Chul Lee),허중식(Joong Sik Heo),김윤제(Youn Jea Kim) 대한기계학회 2007 대한기계학회 춘추학술대회 Vol.2007 No.5
The coupled simulation is performed to find out the interaction of arc plasmas with surrounding materials in a thermal puffer plasma chamber. In order to be more realistic, PTFE nozzle ablation and Cu electrode evaporation, which are caused by high temperature of arc plasmas, are considered together. Pressure rise and temperature inside the chamber generated during the whole arcing history are investigated with the applied currents. It is very important to define how thermal flow and mass transfer are processing between the arc plasma and surrounding materials for further understanding complex physics inside the chamber. It is concluded that the result might be very useful to understand the mechanism happened inside and to design thermal puffer plasma chambers, but further experimental studies are required to verify the results for the more practical applications.
Introduction to the NREL Design Codes for System Performance Test of Wind Turbines
방제성(Bang, Je-Sung),임채환(Rim, Chae Whan),정태영(Chung, Tae Young) 한국신재생에너지학회 2011 한국신재생에너지학회 학술대회논문집 Vol.2011 No.11
NREL NWTC Deside codes are analyzed and introduced to develop the system performance simulation program for wind turbine generator systems. In this paper, The AirfoilPrep generating the airfoil data, the IECWind generating hub-height wind data with extreme condition following IEC 61400-1, the TurbSim generating stochastic full-field turbulent wind data, the PreComp calculating structural and dynamic properties of composite blade and the BModes making mode shapes of blade and tower are explained respectively.
노지웅(Roh Ji-Woong) 한국태양에너지학회 2012 한국태양에너지학회 논문집 Vol.32 No.1
According to the advancement of computer and simulation method, it becomes possible to predict indoor climate precisely by using CFD simulation coupled with heat conduction, convection, and radiation. However, predicting the indoor climate is generally conducted by using a simplified CFD coupled simulation method since it takes quite long time to use a general CFD simulation method, In this study, a simplified CFD coupled simulation was conducted in order to find out the effect of natural ventilation by wind-driven in atrium. As a result of calculation, it was clarified that the natural ventilation driven by temperature difference was not enough to remove the accumulated heat of upper zone and the natural ventilation by wind-driven was needed. Finally, it is required to decide the window direction and size based on correct indoor climate prediction method for the effective use of natural ventilation by wind-driven.