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Unsteady boundary layer and its separation over a heated circular cylinder
Author(s) -
Kim JaeSoo,
Chang KeunShik
Publication year - 1988
Publication title -
international journal for numerical methods in fluids
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.938
H-Index - 112
eISSN - 1097-0363
pISSN - 0271-2091
DOI - 10.1002/fld.1650080205
Subject(s) - laminar flow , mechanics , boundary layer , streamlines, streaklines, and pathlines , buoyancy , cylinder , inflection point , flow separation , boundary layer thickness , mathematics , geometry , classical mechanics , physics
A numerical method is developed to solve the coupled unsteady laminar momentum and thermal boundary layers over a circular cylinder impulsively started from rest. The present non‐iterative finite difference method, which requires relatively fewer grid points in the reversed flow region than any other method, can easily handle the separating boundary layer flows. The results indicate that the present method has accuracy comparable with the earlier methods, while consuming computer time approximately one order of magnitude less. The present numerical method allowed investigation of the effect of buoyancy parameter on the starting boundary layer. The time‐dependent behaviour of the boundary layer is studied in terms of the appearance of the singularity, the distribution of skin friction and wall heat flux, and the wall position of the inflection point of the velocity profile. The transient as well as buoyancy‐dependent patterns of the streamlines and isotherms are also studied.