Wind-Tunnel and Numerical Simulations of the Coastal Thermal Internal Boundary Layer |
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Authors: | Tomohiro Hara Yuji Ohya Takanori Uchida Ryohji Ohba |
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Institution: | (1) Ocean-Atmosphere Dynamics Division, Research Institute for Applied Mechanics, Kyushu University, Kasuga 816-8580, Japan;(2) Nagasaki Research & Development Centre, Mitsubishi Heavy Industries, Ltd., Nagasaki 851-0392, Japan |
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Abstract: | Wind-tunnel experiments in a thermally stratified wind tunnel and direct numerical simulations were performed to simulate
the thermal internal boundary layer (TIBL) that developed over a coastal area in a sea-breeze flow. The results of the simulations
were analyzed to investigate turbulence structure in the TIBL. To study the effects of the atmospheric stability over the
sea on the TIBL, two vertical profiles of temperature were created in the upstream portion of the wind-tunnel experiment and
the direct numerical simulation. Turbulence statistics of the TIBL changed significantly according to the temperature profile
over the sea, indicating that the stability of the flow over the sea has a significant effect on the structure and turbulence
characteristics of the TIBL. Furthermore, the TIBL heights were estimated from the vertical profiles of the local Richardson
number. The estimated TIBL heights agreed with those predicted by a pre-existing relation, suggesting that both the wind-tunnel
experiment and the direct numerical simulation accurately reproduced the growth of the TIBL. |
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Keywords: | Atmospheric stability Direct numerical simulation Sea breeze Thermal internal boundary layer Wind-tunnel experiment |
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