NDLI: Study of low-order numerical effects in the two-dimensional cloud-top mixing layer

Content Provider	Springer Nature Link
Author	Dietze, Eckhard Mellado, Juan Pedro Stevens, Bjorn Schmidt, Heiko
Copyright Year	2012
Abstract	Large-eddy simulation (LES) has been extensively used as a tool to understand how various processes contribute to the dynamics of the stratocumulus layer. These studies are complicated by the fact that many processes are tied to the dynamics of the stably stratified interface that caps the stratocumulus layer, and which is inadequately resolved by LES. Recent direct numerical simulations (DNS) of isobaric mixing due to buoyancy reversal in a cloud-top mixing layer show that molecular effects are in some instances important in setting the cloud-top entrainment rate, which in turn influences the global development of the layer. This suggests that traditional LES are fundamentally incapable of representing cloud-top processes that depend on buoyancy reversal and that numerical artefacts can affect significantly the results. In this study, we investigate a central aspect of this issue by developing a test case that embodies important features of the buoyancy-reversing cloud-top layer. So doing facilitates a one-to-one comparison of the numerical algorithms typical of LES and DNS codes in a well-established case. We focus on the numerical effects only by switching off the subgrid-scale model in the LES code and using instead a molecular viscosity. We systematically refine the numerical grid and quantify numerical errors, validate convergence and assess computational efficiency of the low-order LES code compared to the high-order DNS. We show that the high-order scheme solves the cloud-top problem computationally more efficiently. On that basis, we suggest that the use of higher-order schemes might be more attractive than further increasing resolution to improve the representation of stratocumulus in LES.
Starting Page	239
Ending Page	251
Page Count	13
File Format	PDF
ISSN	09354964
Journal	Theoretical and Computational Fluid Dynamics
Volume Number	27
Issue Number	3-4
e-ISSN	14322250
Language	English
Publisher	Springer-Verlag
Publisher Date	2012-04-11
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Cloud-top mixing layer Buoyancy reversal instability Large-eddy simulation Engineering Fluid Dynamics Classical Continuum Physics Computational Science and Engineering
Content Type	Text
Resource Type	Article
Subject	Fluid Flow and Transfer Processes Condensed Matter Physics Computational Mechanics

Sl.	Authority	Responsibilities	Communication Details
1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
5	Website/Portal (Helpdesk)	Queries regarding NDLI and its services	support@ndl.gov.in
6	Contents and Copyright Issues	Queries related to content curation and copyright issues	content@ndl.gov.in
7	National Digital Library of India Club (NDLI Club)	Queries related to NDLI Club formation, support, user awareness program, seminar/symposium, collaboration, social media, promotion, and outreach	clubsupport@ndl.gov.in
8	Digital Preservation Centre (DPC)	Assistance with digitizing and archiving copyright-free printed books	dpc@ndl.gov.in
9	IDR Setup or Support	Queries related to establishment and support of Institutional Digital Repository (IDR) and IDR workshops	idr@ndl.gov.in

Study of low-order numerical effects in the two-dimensional cloud-top mixing layer

Two-fluid formulation of the cloud-top mixing layer for direct numerical simulation

The compressible mixing layer: an LES study

Cloud microphysical effects of turbulent mixing and entrainment

Recent improvements in the Zonal Detached Eddy Simulation (ZDES) formulation

A new calculus for two-dimensional vortex dynamics

Large eddy simulations of targeted electromagnetic control of buoyancy-driven turbulent flow in a slender enclosure

Wall modeling for implicit large-eddy simulation and immersed-interface methods

Three-dimensional disturbances of a plane-parallel two-layer flow of a viscous, heat-conducting fluid

Study of low-order numerical effects in the two-dimensional cloud-top mixing layer

Similar Documents

Study of low-order numerical effects in the two-dimensional cloud-top mixing layer

Two-fluid formulation of the cloud-top mixing layer for direct numerical simulation

The compressible mixing layer: an LES study

Cloud microphysical effects of turbulent mixing and entrainment

Recent improvements in the Zonal Detached Eddy Simulation (ZDES) formulation

A new calculus for two-dimensional vortex dynamics

Large eddy simulations of targeted electromagnetic control of buoyancy-driven turbulent flow in a slender enclosure

Wall modeling for implicit large-eddy simulation and immersed-interface methods

Three-dimensional disturbances of a plane-parallel two-layer flow of a viscous, heat-conducting fluid

Study of low-order numerical effects in the two-dimensional cloud-top mixing layer