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유한 요소법에 의한 구형단면의 온도분포와 Computational Effort에 관한 연구
용호택,Yong, Ho-Taek 대한설비공학회 1984 설비저널 Vol.13 No.2
The aims of this study are to obtain a suitable method and a proper mesh for investigation of the temperature distribution and heat transfer. The relative errors of temperature distribution and heat transfer for each mesh are acquired in accordance with linear finite element (FEM 3), square finite element (FEM 6), cubic finite element (FEM 10), and finite difference method (FDM). It has been found that FEM 10 is the most accurate measure to obtain the temperature distribution and heat transfer. However, no significant results have been obtained successfully, because when higher order finite element methods are used the more computational efforts are necessary due to the distribution of elements. The results of this study are as follows ; 1 . In case of a=b=L, meshes for less than $1\%$ relative errors (temperature distribution) acquired in various methods to exact solution are $2\times2,\;4\times4,\;8\times8\;and\;8\tiems8$ for each FEM 10, FEM 6, FEM 3 and FDM and a=L, b=1/2L are $10\times5$ for each FEM 3 and FDM. And the tendency of results acquired of heat transfer is similar to those above. 2 . In computational efforts (a=b=L), FEM 6 has taken 21 times. and FEM 10 154times FEM 3 and FDM and FEM 3 is the sane as FDM.
김광수,용호택,Kim Kwang Soo,Yong Ho Taek 대한설비공학회 1987 설비저널 Vol.16 No.5
This study conducts an analysis for the heat diffusion of an annular fin considering con-vection phenomena at the fin edge as well as along the fin perimeter. When the temperature of the fin base is given with an increasing exponential function, the exact series solutions of tem-perature distribution are obtained by laplace transformation in terms of dimensionless para-meters. From these solutions heat flux and fin efficiency can be obtained. These exact solu-tions converge rapidly for large values of dimensionless time, but slowly for small ones. To avoid this convergence difficulty, approximate solutions of the temperature distribution and heat flux for small values of dimensionless time are also presented. Substituting the variations of dimensionless parameters into the these exact solutions, the characteristics of these response are investigated.
두 개의 마이크로폰의 부착된 임피던스관법을 이용한 차음시트의 음향투과손실 측정
이동훈,용호택,이승,Lee, Dong-Hoon,Yong, Ho-Taek,Lee, Seung 대한설비공학회 2002 설비공학 논문집 Vol.14 No.1
The main objective of this study is to propose a practical two-microphone impedance tube method to measure the sound transmission loss for flexible sound isolation sheets without the use of the time-consuming and expensive reverberation room. This method was based on the sound decomposition theory developed by Seybert using the spectral density functions of the incident and reflected sound waves. In order to verify the validity of the experimental results, the measured sound transmission losses from the proposed method were compared with the measured data from the reverberation room method and the calculated data from the theory satisfying the mass law of sound isolation material. The resulted trends of the sound transmission losses versus frequencies for several different sound isolation sheets were almost same for each other and agreed quite well in both methods except at some low frequency region. From the experimental results, it was found that the accuracy of sound isolation capability obtained by two-microphone impedance tube method depends upon the microphone spacing, the distance from the first microphone to the test sample surface and the test sample location.
분리유한요소법과 ILU 예조건화 기법을 이용한 3차원 난류 유동해석
안영규(Youngkyoo Ahn),최형권(Hyoung Gwon Choi),용호택(Ho-Taek Yong) 대한기계학회 2007 대한기계학회 춘추학술대회 Vol.2007 No.10
A segregated finite element method based on SIMPLE algorithm has been developed in order to solve three dimensional flows around a blunt body. This study is the extension of the two dimensional segregated finite element algorithm proposed by Choi & Yoo (1994). For the validation of the algorithm, steady flows around a sphere are solved at various Reynolds numbers. The results agree well with the existing numerical and experimental results. For the analysis of turbulent flow, κ-ω model is adopted for the present algorithm. The turbulence model is tested by solving a pipe flow at Re = 40,000. Lastly, turbulent flows around an Ahmed model are solved for various shapes and the results are compared with the existing experimental and numerical results.