An Improved Surface Boundary Condition for Large-Eddy Simulations Based on Monin–Obukhov Similarity Theory: Evaluation and Consequences for Grid Convergence in Neutral and Stable Conditions

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dc.identifier.uri http://dx.doi.org/10.15488/9263
dc.identifier.uri https://www.repo.uni-hannover.de/handle/123456789/9316
dc.contributor.author Maronga, Björn
dc.contributor.author Knigge, Christoph
dc.contributor.author Raasch, Siegfried
dc.date.accessioned 2020-01-30T13:03:16Z
dc.date.available 2020-01-30T13:03:16Z
dc.date.issued 2019
dc.identifier.citation Maronga, B.; Knigge, C.; Raasch, S.: An Improved Surface Boundary Condition for Large-Eddy Simulations Based on Monin–Obukhov Similarity Theory: Evaluation and Consequences for Grid Convergence in Neutral and Stable Conditions. In: Boundary-Layer Meteorology 174 (2019), Nr. 2, S. 297-325. DOI: https://doi.org/10.1007/s10546-019-00485-w
dc.description.abstract Monin–Obukhov similarity theory is used in large-eddy simulation (LES) models as a surface boundary condition to predict the surface shear stress and scalar fluxes based on the gradients between the surface and the first grid level above the surface. We outline deficiencies of this methodology, such as the systematical underestimation of the surface shear stress, and propose a modified boundary condition to correct for this issue. The proposed boundary condition is applied to a set of LES for both neutral and stable boundary layers with successively decreasing grid spacing. The results indicate that the proposed boundary condition reliably corrects the surface shear stress and the sensible heat flux, and improves grid convergence of these quantities. The LES data indicate improved grid convergence for the surface shear stress, more so than for the surface heat flux. This is either due to a limited performance of the Monin–Obukhov similarity functions or due to problems in the LES model in representing stable conditions. Furthermore, we find that the correction achieved using the proposed boundary condition does not lead to improved grid convergence of the wind-speed and temperature profiles. From this we conclude that the sensitivity of the wind-speed and temperature profiles in the LES model to the grid spacing is more likely related to under-resolved near-surface gradients and turbulent mixing at the boundary-layer top, to the SGS model formulation, and/or to numerical issues, and not to deficiencies due to the use of improper surface boundary conditions. eng
dc.language.iso eng
dc.publisher Dordrecht : Springer Netherland
dc.relation.ispartofseries Boundary-Layer Meteorology 2019 (2019)
dc.rights CC BY 4.0 Unported
dc.rights.uri https://creativecommons.org/licenses/by/4.0/
dc.subject Grid convergence eng
dc.subject Logarithmic layer mismatch eng
dc.subject Monin–Obukhov similarity theory eng
dc.subject Boundary conditions eng
dc.subject Boundary layers eng
dc.subject Heat flux eng
dc.subject Shear stress eng
dc.subject Temperature control eng
dc.subject Wind eng
dc.subject Grid convergence eng
dc.subject Logarithmic layers eng
dc.subject Similarity functions eng
dc.subject Similarity theory eng
dc.subject Stable boundary layer eng
dc.subject Surface boundary conditions eng
dc.subject Surface shear stress eng
dc.subject Temperature profiles eng
dc.subject Large eddy simulation eng
dc.subject.ddc 550 | Geowissenschaften ger
dc.title An Improved Surface Boundary Condition for Large-Eddy Simulations Based on Monin–Obukhov Similarity Theory: Evaluation and Consequences for Grid Convergence in Neutral and Stable Conditions eng
dc.type article
dc.type Text
dc.relation.issn 0006-8314
dc.relation.doi https://doi.org/10.1007/s10546-019-00485-w
dc.bibliographicCitation.volume 2019
dc.description.version publishedVersion
tib.accessRights frei zug�nglich


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