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DNS-aided explicitly filtered LES of channel flow

Bae, H. J. and Lozano-Durán, A. (2018) DNS-aided explicitly filtered LES of channel flow. Annual Research Briefs . pp. 197-207. PMCID PMC6800716. https://resolver.caltech.edu/CaltechAUTHORS:20210315-113839281

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Abstract

The equations for large-eddy simulation (LES) are formally derived by applying a low-pass filter to the Navier–Stokes (NS) equations (Leonard 1975). However, in most numerical simulations, no explicit filter form is specified, and the computational grid and the low-pass characteristics of the discrete differentiation operators act as an effective implicit filter. The resulting velocity field is then assumed to be representative of the filtered velocity. Although the discrete operators have a low-pass filtering effect, the associated filter acts only in the single spatial direction in which the derivative is applied (Lund 2003); thus each term in the NS equations takes on a different filter form. In addition, numerical errors and the frequency content are uncontrolled for the implicit filter approach, and the solutions are grid dependent (Kravchenko & Moin 2000; Meyers & Sagaut 2007).


Item Type:Article
Related URLs:
URLURL TypeDescription
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6800716PubMed CentralArticle
https://arxiv.org/abs/1902.02508arXivDiscussion Paper
ORCID:
AuthorORCID
Bae, H. J.0000-0001-6789-6209
Lozano-Durán, A.0000-0001-9306-0261
Alternate Title:DNS-aided explicitly filtered LES
Additional Information:© 2018 Stanford University. This work was supported by NASA under the Transformative Aeronautics Concepts Program, Grant No. NNX15AU93A.
Group:GALCIT
Funders:
Funding AgencyGrant Number
NASANNX15AU93A
PubMed Central ID:PMC6800716
Record Number:CaltechAUTHORS:20210315-113839281
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20210315-113839281
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:108434
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:19 Mar 2021 01:00
Last Modified:19 Mar 2021 20:44

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