scholarly journals Seasonal variation of residual flow in the east sea

2003 ◽  
Vol 25 (3) ◽  
pp. 153-169 ◽  
Author(s):  
Dinh Van Manh ◽  
Tetsuo Yanagi
Keyword(s):  
Surface Layer ◽  
Seasonal Variation ◽  
Numerical Model ◽  
Current Density ◽  
Three Dimensional ◽  
Residual Current ◽  
East Sea ◽  
Residual Flow ◽  
Residual Flows ◽  
Autumn And Winter

A diagnostic three-dimensional numerical model has been established in order to reveal the seasonal variation of residual flow, including wind-driven current, density-driven current and tide-induced residual current, in the East Sea. The observed data on water temperature, salinity (from JODC, 1930-1996) and wind (from GOADS, 1961-1991) were exploited in this study. Residual flows in 4 seasons (spring, summer, autumn and winter) were simulated. Furthermore, the contribution of each component, wind-driven, density-driven and tide-induced residual current, was evaluated. On the basis of the obtained results, it is shown that the wind-driven current plays an important role in the basin-wide circulation in the East Sea, especially in the surface layer. At the lower levels, the density-driven current becomes more significant. The tide-induced residual current is relatively small.

Numerical Simulation of Electrical Performance and Distribution of SOFC Stacks With Different Manifold Arrangement

2020 ◽  
Author(s):  
Quan Hou ◽  
Yuhua Wu ◽  
Haokun Liu ◽  
Xinhai Xu ◽  
Ben Xu
Keyword(s):  
Temperature Distribution ◽  
Numerical Model ◽  
Current Density ◽  
Three Dimensional ◽  
Flow Distribution ◽  
Electrical Performance ◽  
Fuel Cell Stack ◽  
Individual Unit ◽  
Distribution Uniformity ◽  
Sofc Stacks

Abstract In this study, a three-dimensional solid oxide fuel cell stack numerical model was developed and validated by experimental data. Five-cell SOFC stacks with different inlet and outlet manifold arrangement were investigated employing the numerical model. The stack polarization curve, current density, temperature, and flow distributions were analyzed. The results show that the effect of different manifold arrangement is almost neglected on the polarization curves and flow distribution. However, the current density and temperature distribution in individual unit of the stack can be influenced by the locations of inlets and outlets in the manifolds. Considering current density and temperature distribution uniformity as well as ease manufacturing and installation, the manifold arrangement with inlets at the top and outlets at the bottom for both fuel and air is recommended for SOFC stacks.

scholarly journals A new three-dimensional residual flow theory and its application to Brewer–Dobson circulation in the middle and upper stratosphere

2021 ◽  
Author(s):  
Kaoru Sato ◽  
Takenari Kinoshita ◽  
Yuki Matsushita ◽  
Masashi Kohma
Keyword(s):  
Potential Temperature ◽  
Three Dimensional ◽  
Polar Vortex ◽  
Geostrophic Wind ◽  
Stationary Waves ◽  
Residual Flow ◽  
Transient Waves ◽  
Mean Fields ◽  
Residual Flows ◽  
June July

Abstract This study formulates three-dimensional (3-D) residual flow, treating both stationary and transient waves. The zonal and meridional momentum equations contain four terms: the geostrophic wind tendency, Coriolis force for the residual horizontal flow, product of the geostrophic wind and potential vorticity other than the constant planetary vorticity, and friction. The thermodynamic equation contains three terms: the potential temperature tendency, advection of the basic potential temperature by the residual vertical flow, and diabatic heating. The zonal mean of the 3-D residual flow equals the time mean of the residual flow of the transformed Eulerian mean equations. The new residual flow is the sum of that derived by Plumb for transient waves and the quadratic terms of the time-mean fields, which correspond approximately to the Stokes correction due to stationary waves. The 3-D residual flow and momentum equations are symmetric in the zonal and meridional directions, in contrast with those formulated by Kinoshita et al., which treat the time-mean zonal-mean zonal wind as the basic wind. The newly derived formulae are applied to the climatology of the 3-D structure of the deep branch of the Brewer–Dobson circulation. In the Northern Hemisphere in December–January–February, the residual flows are directed inward toward the polar vortex strongly over East Siberia, where the downward flow is maximized, and weakly over the Atlantic; meanwhile, they are directed outward from the vortex over North America and Europe. A longitudinal dependence of the poleward flow is also observed in the Southern Hemisphere in June–July–August.

A THREE-DIMENSIONAL NUMERICAL MODEL FOR SELECTIVE WITHDRAWAL IN COASTAL AREA

2018 ◽  
Vol 74 (5) ◽  
pp. I_571-I_576
Author(s):  
Yasuo NIIDA ◽  
Norikazu NAKASHIKI ◽  
Takaki TSUBONO ◽  
Shin’ichi SAKAI ◽  
Teruhisa OKADA
Keyword(s):  
Numerical Model ◽  
Coastal Area ◽  
Three Dimensional ◽  
Selective Withdrawal

scholarly journals Blowing and drifting snow in Alpine terrain: numerical simulation and related field measurements

1998 ◽  
Vol 26 ◽  
pp. 174-178 ◽  
Author(s):  
Peter Gauer
Keyword(s):  
Numerical Simulation ◽  
Numerical Model ◽  
Three Dimensional ◽  
Field Measurements ◽  
Blowing Snow ◽  
Related Field ◽  
Drifting Snow ◽  
Physically Based ◽  
Snow Transport

A physically based numerical model of drifting and blowing snow in three-dimensional terrain is developed. The model includes snow transport by saltation and suspension. As an example, a numerical simulation for an Alpine ridge is presented and compared with field measurements.

Three-dimensional porous copper-decorated bismuth-based nanofoam for boosting electrochemical reduction of CO2 to formate

2021 ◽  
Author(s):  
Yingchun Zhang ◽  
Changsheng Cao ◽  
Xintao Wu ◽  
Qi-Long Zhu
Keyword(s):  
Current Density ◽  
High Current Density ◽  
Three Dimensional ◽  
Co2 Reduction ◽  
Reduction Reaction ◽  
High Current ◽  
Porous Copper ◽  
Reduction Of Co2 ◽  
Co2 Reduction Reaction ◽  
Wide Potential

Bismuth (Bi)-based nanomaterials are considered as the promising electrocatalysts for electrocatalytic CO2 reduction reaction (CO2RR), but it is challenging to achieve high current density and selectivity in a wide potential...

Three-dimensional numerical model of short-circuiting transfer in GMAW

2020 ◽  
Vol 64 (12) ◽  
pp. 2011-2017
Author(s):  
K. Hashimoto ◽  
Y. Hirata ◽  
K. Kadota ◽  
Y. Ogino
Keyword(s):  
Numerical Model ◽  
Three Dimensional
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