DOI QR코드

DOI QR Code

A Numerical Analysis for Two-phase Turbulent Flow in the Neutral Atmosphere

중립 대기 상태에서 이상 난류유동에 관한 수치적 연구

  • Published : 2002.06.01

Abstract

A numerical analysis of turbulent gas-particle two-phase flow is performed in conjunction with the experiments of Fackrell & Robins and Raupach & Legg that considered ground-level source and/or elevated source flat plate flow. K-$\omega$ turbulence model is used in order to analyze fully turbulent flow field and the concentration equation with settling velocity is adopted for the concentration field. The model of Einstein and Chien is applied that couples the velocity field and the concentration field. Turbulent eddy viscosity is re-evaluated in this model. The present numerical results have good agreement between the simulation and the experimental data for the mean flow velocities and particle concentrations. While the previous study shows about 27% error in the vicinity of the source of particle concentration, the .present study allows about 14% error. A new turbulent gas-particle flow model developed by this study is able to cut down error by 13% at a near source.

Keywords

References

  1. Fackrell, J.E. and Robins, A.G., 1982, 'Concentration Flutuations and Fluxes in Plumes from point Sources in a Turbulent Boundary Layer', J.Fluid Mech., Vol. 117, pp. 1-26 https://doi.org/10.1017/S0022112082001499
  2. Raupach, M.R. and Legg, B.J., 1983, 'Turbulent Dispersion from an Elevated Line Source: Measurements of Wind Concentration Moments and Budgets,' J.Fluid Mech., Vol. 136, pp. 111-137 https://doi.org/10.1017/S0022112083002086
  3. Bringfelt B., 1984, 'Phoenics - Simulations of Plume Spread in the Lee of a Building and Comparisons with Smoke Experiments and Gaussian Dispersion Formale,' Meteorologiska Avdelningen for skningssektionen
  4. Serag-Eldin, M.A., 1985, 'The Spread of Pollutants Emitted Long and Large Obstacles in Atmosphere,' CAIRO SCIENTIFIC CENTER Technical Report 009
  5. Kim, H.G., 1997, 'Numerical Investigation of the Pollutant Dispersion over Complex Terrain,' Pohang University of Science and Technology, Ph.D.Thesis
  6. Kim, Hyun Goo and Lee, Chang Mook, 1998, 'Pollutant Dispersion Over Two-Dimensional Hilly Terrain,' KSME International Journal, Vol. 12, No. 1, pp. 96-111 https://doi.org/10.1007/BF02946538
  7. 박 근, 박원규, 1998, '2차원 종형 언덕 주위의 유동 및 확산현상에 관한 수치해석적 연구,' 한국전산유체공학회지, 제3권, 제1호, pp. 63-72
  8. Einstein, H.A. and Chien, N., 1995, 'Effects of Heavy Sediment Concentration Near the Beds on Velocity and Sediment Distribution,' U.S. Army Enginnering Division, MRD series No. 8
  9. Wilcox, D.C., 'Reassessment of the Scale Determining Equation for Advanced Turbulence Models,' AIAA J., Vol. 26, No. 11, pp. 1299-1310 https://doi.org/10.2514/3.10041
  10. van Rijn, L.C., 1984, 'Sediment Transport PartII : Suspended Load Transport,' J. Hydr. Eng., ASCE, Vol. 110, No. 11, pp.1613-1641 https://doi.org/10.1061/(ASCE)0733-9429(1984)110:11(1613)
  11. Yoon, J.Y. and Patel, V.C., 1996, 'Numerical Model of Turbulent Flow over Sand Dune,' J. Hydraulic Eng., ASCE, Vol. 122, No. 1, pp. 10-18 https://doi.org/10.1061/(ASCE)0733-9429(1996)122:1(10)
  12. 김현구, 이정묵, 1998, '난류확산계수의 수정에 의한 Eulerian확산 모델의 개선', 대한기계학회논문집 B권, 제22권, 제10호, pp. 1483-1489
  13. 윤준용, 강승규, 강시환, 2000, '개수로에서 소유사의 영향을 고려한 부유입자 유동에 관한 수치적 연구', 한국수자원학회지, 제33권, 제4호, pp. 461-469

Cited by

  1. Numerical Investigation of Pollutant Dispersion in a Turbulent Boundary Layer by Using Lattice Boltzmann-Subgrid Model vol.35, pp.2, 2011, https://doi.org/10.3795/KSME-B.2011.35.2.169