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학술연구/단체지원/교육 등 연구자 활동을 지속하도록 DBpia가 지원하고 있어요.
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논문 기본 정보
- 자료유형
- 학술저널
- 저자정보
- 저널정보
- 대한기계학회 Journal of Mechanical Science and Technology Journal of Mechanical Science and Technology Vol.21 No.11
- 발행연도
- 2007.11
- 수록면
- 1,828 - 1,846 (19page)
이용수
초록· 키워드
오류제보하기
Numerical simulation serves as one of the most important tools for analyzing coal combustion in Tangentially Fired Furnaces (TFF) with NUMERICAL FALSE DIFFUSION as one key problem that degrades the simulation accuracy, especially for complex flow patterns. False diffusion often completely compromises the accuracy, leading to erroneous predictions. This paper reviews various methods to reduce the numerical diffusion. In computational fluid dynamics (CFD), false diffusion originates from a truncation error of the Taylor series approximation of the derivative and multidimensional discretization effects. Higher-order upwind convective schemes were designed to reduce truncation errors, while grid line adjusting methods were developed to reduce crossflow diffusion. This paper compares numerical and experimental results for isothermal flows to evaluate these methods. Results with the standard upwind scheme in a rectangular Cartesian mesh are compared with results in body-fitted meshes for comprehensive combustion processes in a TFF. Analysis of the false diffusion effect in the x, y, z directions and the artificial viscosity distribution in a rectangular mesh shows where the false diffusion overtakes the real physical diffusion and where the mesh must be refined or grid line must be adjusted to improve TFF combustion simulations.
목차
Abstract
1. Introduction
2. Origin of false diffusion
3. Evaluation of false diffusion
4. False diffusion reduction methods
5. The coal combustion simulations and diffusion effects in utility boilers
6. Comparison of various simulation schemes for tagentially fired furnaces
7. Comparison of rectangular and body-fitted mesh predictions of combustion processes
8. Conclusions
References
참고문헌 (58)
참고문헌 신청
1. [학술지(정기간행물)] - / 2000 / Future progress in turbulent combustionresearch : 367 ~ 380
2. [학술지(정기간행물)] - / 2005 / Numerical simulation of combustion process in a200MW tangentially fired furnace to study furnacereconstruction 25 (8) : 80 ~ 84
3. [학술지(정기간행물)] - / 2003 / Further study of the gas temperature deviation in large-scaletangentially coal-fired boilers, Fuel. 82 : 1127 ~ 1137
4. [학술지(정기간행물)] - / 2001 / Further studieson the coal combustion behavior in the tangentiallyfired boiler furnace 21 (1) : 81 ~ 84
5. [학술지(정기간행물)] - / 1995 / Why you should not use ‘Hybrid’, ‘Power-low’ or related exponential schemes for connective modeling-There are much better alternatives 20 : 421 ~ 442
2. [학술지(정기간행물)] - / 2005 / Numerical simulation of combustion process in a200MW tangentially fired furnace to study furnacereconstruction 25 (8) : 80 ~ 84
3. [학술지(정기간행물)] - / 2003 / Further study of the gas temperature deviation in large-scaletangentially coal-fired boilers, Fuel. 82 : 1127 ~ 1137
4. [학술지(정기간행물)] - / 2001 / Further studieson the coal combustion behavior in the tangentiallyfired boiler furnace 21 (1) : 81 ~ 84
5. [학술지(정기간행물)] - / 1995 / Why you should not use ‘Hybrid’, ‘Power-low’ or related exponential schemes for connective modeling-There are much better alternatives 20 : 421 ~ 442
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