Air flow aerodynamic on a wall-mounted hemisphere for various turbulent boundary layers

Experimental Investigation and Large-Eddy Simulation of the Turbulent Flow past a Smooth and Rigid Hemisphere

“…It is interrelated to the turbulence intensity of the approaching boundary layer. According to previous studies [6,8,23,25] the turbulence level of the oncoming flow influences the length of the recirculation area since with increasing turbulence intensity the location of the separation point is shifted to a further downstream position on the hemisphere. An investigation comparing LES predictions without and with STIG data strongly supports this observation (see Appendix Appendix C).…”

“…The characteristics of the turbulent flow field were compared with the experimental results mentioned above [14][15][16] strongly focusing on the formation of the separation region on the rear side of the bump. A combined experimental and numerical study was accomplished by Tavakol et al [25]. A hemisphere was immersed in two turbulent boundary layers of different thickness.…”

“…Recently, Tavakol et al [27] presented a yet deeper investigation of the hemisphere flow using LES at Re = 3.6 × 10 4 and 6.4 × 10 4 . Based on the earlier study [25] the main focus of this paper was to highlight the superior results of the applied LES compared to the previously performed RANS simulations. The numerical grid consisted of 4.2 × 10 6 CVs.…”

LES simulation of hemispherical dome's aerodynamic characteristics in smooth and turbulence boundary layer flows

“…Meroney et al (2002) conducted the numerical simulation to study the mean pressure distribution of an isolated dome and the interference effects between two neighboring domes immersed in a turbulent boundary layer flow. Tavakol et al (2010) experimentally and numerically investigated the flow field around a surface-mounted hemisphere of a fixed height in two different turbulent boundary layers. The results indicated that the RNG k-ε turbulence model overestimates the stream-wise velocity over the hemisphere when the Reynolds number equals to 2.5 Â 10 4 and 3.2 Â 10 4 .…”

Thermal study of a cistern's dome (the case of Motamed cistern in Lar, Iran)

“…A c c e p t e d M a n u s c r i p t This equation accounts for the beam radiation I beam , diffuse radiation received from the sky I diff 1 and that reflected by the ground I ref which is employed by Eqs. (7) to (9). ρ g is ground reflectance 2 coefficient and is assumed equal to 0.…”