Stratified flow past a sphere at moderate Reynolds numbers
Stratified flow past a sphere at moderate Reynolds numbers
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流过中等雷诺数球体的分层流
DOI:
10.1016/j.compfluid.2021.104998
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发表时间:
2021
影响因子:
2.8
通讯作者:
Cocetta F
中科院分区:
文献类型:
--
作者:
Cocetta F
A numerical study of stably stratified flows past spheres at Reynolds numbers R e= 200 and R e= 300 is reported. In these flow regimes, a neutrally stratified laminar flow induces distinctly different near-wake features. However, the flow behaviour changes significantly as the stratification increases and suppresses the scale of vertical displacements of fluid parcels. Computations for a range of Froude numbers F r∈[0.1,∞] show that as Froude number decreases, the flow patterns for both Reynolds numbers become similar. The representative simulations of the lee-wave instability at F r= 0.625 and the two-dimensional vortex shedding at F r= 0.25 regimes are illustrated for flows past single and tandem spheres, thereby providing further insight into the dynamics of stratified flows past bluff bodies. In particular, the reported study examines the relative influence of viscosity and stratification on the dividing streamline elevation, wake structure and flow separation. The solutions of the Navier-Stokes equations in the incompressible Boussinesq limit are obtained on unstructured meshes suitable for simulations involving multiple bodies. Computations are accomplished using the finite volume, non-oscillatory forward-in-time (NFT) Multidimensional Positive Definite Transport Algorithm (MPDATA) based solver. The impact and validity of the numerical approximations, especially for the cases exhibiting strong stratification, are also discussed. Qualitative and quantitative comparisons with available laboratory experiments and prior numerical studies confirm the validity of the numerical approach.
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DOI:
--
发表时间:
1997
期刊:
影响因子:
--
作者:
P. Smolarkiewicz;V. Grubišić;L. Margolin
通讯作者:
L. Margolin
影响因子:
4.1
作者:
P. Smolarkiewicz;W. Deconinck;M. Hamrud;C. Kühnlein;G. Mozdzynski;J. Szmelter;N. Wedi
通讯作者:
N. Wedi
DOI:
--
发表时间:
2016
期刊:
影响因子:
--
作者:
V. Gushchin;P. Matyushin
通讯作者:
P. Matyushin
DOI:
--
发表时间:
1988
期刊:
影响因子:
--
作者:
Ronald B. Smith
通讯作者:
Ronald B. Smith
影响因子:
3.7
作者:
Anikesh Pal;S. Sarkar;A. Posa;E. Balaras
通讯作者:
E. Balaras