کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
762816 896711 2011 6 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Numerical simulation of wave propagation along a discontinuity in depth in a rotating annulus
موضوعات مرتبط
مهندسی و علوم پایه سایر رشته های مهندسی مکانیک محاسباتی
پیش نمایش صفحه اول مقاله
Numerical simulation of wave propagation along a discontinuity in depth in a rotating annulus
چکیده انگلیسی

Coastal currents are strongly affected by the topography of the ocean bed close to the shore. In some locations, notably off the southern coast of Africa, the ocean depth drops off very sharply, forming a shelf break. Several authors have analysed the role of such sharply-varying topography in steering and stabilising coastal currents. The present work aims to resolve an apparent conflict between theoretical and experimental results for currents flowing along discontinuous topography in a rotating annulus. The existing analytical theory, based on a long-wave scaling, fails to explain the short-wavelength instabilities and wave breaking that arise in the laboratory experiments.We integrate the rigid-lid quasigeostrophic (QG) equations numerically in an annular domain using a combined finite-difference/pseudo-spectral approach. To replicate the inviscid theoretical conditions as closely as possible, we employ an additional piecewise-linear source term that sharpens fronts of potential vorticity. We find that initial configurations that vary slowly in azimuth rapidly develops features with large azimuthal variations. The numerical results also produce the same qualitative features as the experiments, suggesting that the experiments are well described by QG theory.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Computers & Fluids - Volume 46, Issue 1, July 2011, Pages 442–447
نویسندگان
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