کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1719495 1014046 2008 10 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Wall-layer models for large-eddy simulations
موضوعات مرتبط
مهندسی و علوم پایه سایر رشته های مهندسی مهندسی هوافضا
پیش نمایش صفحه اول مقاله
Wall-layer models for large-eddy simulations
چکیده انگلیسی

The numerical simulation of high Reynolds number flows is hampered by model accuracy if the Reynolds-averaged Navier–Stokes (RANS) equations are used, and by computational cost if direct or large-eddy simulations (LES) that resolve the near-wall layer are employed. The cost of a calculation scales like the Reynolds number to the power 3 for direct numerical simulations, or 2.4 for LES, making the resolution of the wall layer at high Reynolds number infeasible even with the most advanced computers. In LES, an attractive alternative to compute high-Re flows is the use of wall-layer models, in which only the outer layer is resolved, while the near-wall region is modeled. Three broad classes of approaches are presently used: bypassing this region altogether using wall functions, solving a separate set of equations in the near-wall region, weakly coupled to the outer flow, or simulating the near-wall region in a global, Reynolds-averaged, sense. These approaches are discussed and their ranges of applicability are highlighted. Various unresolved issues in wall-layer modeling are presented.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Progress in Aerospace Sciences - Volume 44, Issue 6, August 2008, Pages 437–446
نویسندگان
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