globalchange  > 气候减缓与适应
DOI: 10.1029/2018JF004663
Scopus记录号: 2-s2.0-85050610683
论文题名:
Reply to Comment by Sookhak Lari, K. and Davis, G. B. on “ ‘Large Eddy Simulation of Turbulence and Solute Transport in a Forested Headwater Stream’: Invalid Representation of Scalar Transport by the Act of Diffusion”
作者: Khosronejad A.; Sotiropoulos F.
刊名: Journal of Geophysical Research: Earth Surface
ISSN: 21699003
出版年: 2018
卷: 123, 期:7
起始页码: 1610
结束页码: 1612
语种: 英语
英文关键词: immersed boundary method ; LES ; natural stream ; solute transport ; turbulent mixing
Scopus关键词: Charadrii
英文摘要: Based on the molecular diffusion coefficient used in the large eddy simulation (LES) (equation (3) of the article), one can easily infer that a molecular Schmidt number of 700 was adopted for the solute. It should be acknowledged that in the published article we omitted to include the value used for the molecular diffusion and did not mention that is the reciprocal of the turbulent Schmidt number. Although these details should have been included, these omissions do not change well-established facts that in turbulent flows the mixing of the solute by the molecular diffusion is many orders of magnitude less important than that induced by the turbulence. As we mentioned in our article, the viscous sublayer in the Eagle Creek stream was not resolved in our simulations as the first node off the solid boundaries in wall units was (on average) equal to 45 (see Table 3 of the article). This implies that all of the computational nodes are located well outside of the viscous sublayer, where molecular diffusion becomes dominant. Moreover, since we carry out LES, we do not resolve the Kolmogorov scales in the flow the rate of dissipation of which is governed by molecular viscosity. Rather, the subgrid scale eddy viscosity of the LES acts as the model for the effect of the unresolved scales of motion. Even though all these are well-known facts from fundamental theory of turbulent mixing, we include in this response additional simulations to address the concerns raised in this commentary. ©2018. American Geophysical Union. All Rights Reserved.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/113602
Appears in Collections:气候减缓与适应

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作者单位: Civil Engineering Department, College of Engineering and Applied Science, Stony Brook University, Stony Brook, NY, United States

Recommended Citation:
Khosronejad A.,Sotiropoulos F.. Reply to Comment by Sookhak Lari, K. and Davis, G. B. on “ ‘Large Eddy Simulation of Turbulence and Solute Transport in a Forested Headwater Stream’: Invalid Representation of Scalar Transport by the Act of Diffusion”[J]. Journal of Geophysical Research: Earth Surface,2018-01-01,123(7)
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