دانلود مقاله ISI عمران – قابلیت اطمینان از تخمین تنش دیوار برشی جریان در اطراف یک استوانه دیوار نصب

دانلود مقاله ISI عمران – قابلیت اطمینان از تخمین تنش دیوار برشی جریان در اطراف یک استوانه دیوار نصب

Thin Walled Structures, 104 + (2016) 238-247. doi:10.1016/j.tws.2016.03.015
Saeed Mohebbi
Cold-formed steel; Shear stud-wall; Steel sheathing; Gypsum and fiber cement board cladding; Shear strength; Energy dissipation
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mso-bidi-theme-font:minor-bidi;}نمایه شده در ELSEVIER  عنوان فارسی:قابلیت اطمینان از تخمین تنش دیوار برشی جریان در اطراف یک استوانه دیوار نصب
شدهعنوان انگلیسی:  Reliability of wall shear stres sestimations
of the flow around a wall-mounted cylinderتعداد صفحات: 16زبان مقاله: انگلیسیسال انتشار: 2016نام ژورنال: Computers and Fluids  AbstractThe flow field and wall shear stresses around a wall-mounted cylinder for a Reynolds number of ReD=39000,ReD=39000,
based on the diameter of the cylinder and the bulk velocity, was
investigated applying Large-Eddy Simulation (LES). We used a
Finite-Volume method on a Cartesian grid with staggered arrangement of
the variables. The curved surface of the cylinder has been approximated
by a conservative second order Immersed Boundary method.We
carefully validate our simulation in terms of grid resolution, inflow
condition and contribution of subgrid scale stresses. Around the
cylinder, local grid refinement provides spacings of 7.5 wall units in
horizontal and 1.9 wall unit in vertical direction based on the the wall
shear stress of the oncoming flow. Thus, the contributions of the
modeled subgrid scale stresses remain small compared to other stresses
and the flow variables converge with grid resolution.We
demonstrate that the flow structure and predicted wall shear stresses
strongly depend on the inflow condition, which has to take into account
turbulent fluctuations and the secondary flow, if present. A maximum
amplification factor of the time-averaged wall shear stress of 12.0 with
respect to the one in the oncoming flow field shows up in the lateral
front of the cylinder. Instantaneous wall shear stresses however reach a
maximum amplification factor of up to 40 in the wake of the cylinder.