[논문]High-Resolution Flow Simulations Around a Steep Mountainous Island in Korea Using a CFD Model with One-way Nested Grid System

Mun, Da-Som; Kim, Jae-Jin

doi:10.7780/kjrs.2020.36.4.6

[국내논문] High-Resolution Flow Simulations Around a Steep Mountainous Island in Korea Using a CFD Model with One-way Nested Grid System 원문보기

대한원격탐사학회지 = Korean journal of remote sensing, v.36 no.4, 2020년, pp.557 - 571

Mun, Da-Som (Division of Earth Environmental System Science, Pukyong National University) , Kim, Jae-Jin (Division of Earth Environmental System Science, Pukyong National University)

Abstract ▼ AI-Helper

High-resolution flows around a steep mountainous island (Ulleungdo) in Korea were simulated by a computational fluid dynamics (CFD) model. To cover entire Ulleungdo and to resolve the topography around the Ulleungdo automatic synoptic observing system (ASOS) with high resolution, one-way nested grid system with large (60 m), and small (20 m) grid sizes was applied in the CFD model simulations. We conducted the numerical simulations for 16 inflow directions, and, for each inflow direction, we considered six different wind velocities(5, 10, 15, 20, 25, and 30 m s-1) at the reference height (1,000 m). The effects of topography on surface wind observations were well reflected in the observed wind roses for the period of January 01, 2012 ~ December 31, 2016 at the Ulleungdo ASOS and marine buoy. Wind roses at the Ulleungdo ASOS was reproduced based on the CFD simulations. The changes in surface winds at the Ulleungdo ASOS caused by surrounding topography were relatively well simulated by the CFD model. The simulated wind-rose indicated that south-southwesterly and northeasterly were the dominant wind directions, which were also observed at the Ulleungdo ASOS. We investigated the flow characteristics around the Ulleungdo ASOS for northwesterly, south-southwesterly, and northeasterly winds in detail.

주제어

표/그림 (13)

그림 Fig. 1. Satellite photographs around (a) Ulleungdo, and (b) the Ulleungdo ASOS (ASOS 115).
그림 Fig. 2. Three-dimensional topographic configurations for the areas around (a) Ulleungdo, and (b) Ulleungdo ASOS.
그림 Fig. 3. Wind-roses measured at (a) the Ulleungdo marine buoy and (b) the Ulleungdo ASOS for 2012. 01. 01 ~ 2016. 12. 31.
그림 Fig. 4. Wind speeds and directions simulated at the Ulleungdo ASOS for the 16 inflow directions in the UD1[(a) and (b)] and UD2 simulations [(c) and (d)].
그림 Fig. 6. Wind-roses at the Ulleungdo ASOS reconstructed on the basis of wind-direction frequencies at the Ulleungdo marine buoy and the 96 results in (a) UD1 and (b) UD2 simulations.
그림 Fig. 5. (a) Observed and simulated percentiles of the wind speeds at the Ulleungdo ASOS (ASOS 115) and those at the Ulleungdo marine buoy for the 16 inflow wind directions in UD1 and UD2 simulations and (b) the relationship of the observed and simulated wind directions at the Ulleungdo ASOS and those at the Ulleungdo marine buoy.
그림 Fig. 7. The streamlines at z = 10 m in the UD1 simulations in the northwesterly case.
그림 Fig. 8. The wind vectors (left panel) and distribution of the wind speeds (right panel) at the surface (z = 10 m) inside the domain 2 in the [(a) and (b)] UD1, [(c) and (d)] UD2 simulations in the northwesterly case.
그림 Fig. 10. The same as in Fig. 8 except for the south-southwesterly case.
그림 Fig. 9. The same as in Fig. 7 except for the south-southwesterly case.
그림 Fig. 11. The same as in Fig. 7 except for the northeasterly case.
그림 Fig. 12. The same as in Fig. 8 except for the northeasterly case.
$Fig. 13. The streamlines and contours of vertical wind components taken along (a) (<TEX>$\overline{AB}$</TEX>) in Fig. 12(a) and (b) (<TEX>$\overline{CD}$</TEX>) in Fig. 12(c).$ 그림 Fig. 13. The streamlines and contours of vertical wind components taken along (a) ($\overline{AB}$) in Fig. 12(a) and (b) ($\overline{CD}$) in Fig. 12(c).

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