The Wall-Jet Region of a Turbulent Jet Impinging on Smooth and Rough Plates
نویسندگان
چکیده
Abstract The study reports direct numerical simulations of a turbulent jet impinging onto smooth and rough surfaces at Reynolds number Re = 10,000 (based on the mean bulk velocity diameter). Surface roughness is included in using an immersed boundary method. deflection flow after impingement generates radial wall-jet that develops parallel to plate surface. structured into inner outer layer that, limit infinite local number, resemble free-shear flow. investigation assesses self-similar character stresses profiles scaled by units for varying size topography. Namely usual viscous $$u_\tau$$ u τ $$\delta _\nu$$ δ ν are used as scales, while maximum $$u_m$$ m its wall-normal location $$z_m$$ z scales. It shown self-similarity marginally affected span topographies investigated, length reference scales do not show significantly modified behavior when surface considered. On other hand, considerable scatter, sub-layer determined considered extends up wall-jet. Nevertheless, similar appears be conserved despite profound impact roughness.
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ژورنال
عنوان ژورنال: Flow, turbulence and combustion
سال: 2022
ISSN: ['1573-1987', '1386-6184']
DOI: https://doi.org/10.1007/s10494-022-00387-x