کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
656266 1457683 2006 12 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Nonlinear stochastic estimation of wall models for LES
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی جریان سیال و فرایندهای انتقال
پیش نمایش صفحه اول مقاله
Nonlinear stochastic estimation of wall models for LES
چکیده انگلیسی

A key technology for large eddy simulation (LES) of complex flows is an appropriate wall modeling strategy. In this paper we apply for the first time a fully nonparametric procedure for the estimation of generalized additive models (GAM) by conditional statistics. As a database, we use DNS and wall-resolved LES data of plane channel flow for Reynolds numbers, Re = 2800, 4000 (DNS) and 10,935, 22,776 (LES). The statistical method applied is a quantitative tool for the identification of important model terms, allowing for an identification of some of the near-wall physics. The results are given as nonparametric functions which cannot be attained by other methods. We investigated a generalized model which includes Schumann’s and Piomelli et al.’s model. A strong influence of the pressure gradient in the viscous sublayer is found; for larger wall distances the spanwise pressure gradient even dominates the τw,zy component. The first a posteriori LES results are given.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: International Journal of Heat and Fluid Flow - Volume 27, Issue 2, April 2006, Pages 267–278
نویسندگان
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