大气边界层日循环的有限元偏微分方程的稳定性

IF 5.6 1区 数学 Q1 MATHEMATICS, INTERDISCIPLINARY APPLICATIONS
V. Geethalakshmi , R. Ravi Kumar , M.K. Kalarani , R. Karthikeyan , R. Sivakumar , N.K. Sathyamoorthy , Ga. Dheebakaran
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引用次数: 0

摘要

我们使用从有限元模型中导出的质量、动量、能量和水分方程的守恒定律来评估大气边界层流动日循环的稳定性。结果显示了温度、压力和风速对不同区域中尺度流动的最准确预测,尽管初始边界条件和阻尼边界条件的动态影响,等熵仍然保持稳定。由于温度和风梯度较弱,湍流的程度会波动。为了确定在低层大气冷核和气旋系统的特定区域,哪些等熵是稳定的,本工作采用自适应不连续有限元伽辽金方法的数值天气预报(NWP)来检测温度、压力、风速和湍流振荡模态的大小。我们选择起始网格点为经纬度值(金奈),2、4、6、8、10、12米级别的风速,温度和相对湿度,然后将其他节点作为每50公里距离的经纬度值,2、4、6、8、10、12米级别的风速,温度和相对湿度作为起始节点和结束节点值(哥印拜陀)。计算域为矩形,水平550 km,高度2000 m。为了较好地解决锋面运动问题,我们将该区域离散为91 × 91矩形双二次元,有效水平网格间距为2 km,从海岸向内陆延伸30 km。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Stability of the diurnal cycles of an atmospheric boundary layer in a partial differential equation with a finite element model
We use the conservation laws of mass, momentum, energy, and moisture equations derived from a finite element model to assess the stability of diurnal cycles of atmospheric boundary layer flow. The results show the most accurate predictions for how temperature, pressure, and wind speed affect mesoscale flow in various domains, with isentropes remaining stable despite the dynamic influence of initial and damped boundary conditions. The degree of turbulence can fluctuate due to weak temperature and wind gradients. In order to determine which isentropes are stable in a particular area of the cold core and cyclonic system in the lower atmosphere, this work employs the numerical weather prediction (NWP) of adaptive discontinuous finite element Galerkin approach to detect temperature, pressure, wind speed, and magnitude of the turbulence oscillation mode. We select starting mesh point is longitude and latitude values (Chennai), wind speed at 2, 4, 6, 8, 10, 12 m level, temperature and relative humidity, then other nodes are treated as every 50 km distance longitude and latitude value, wind speed at 2, 4, 6, 8, 10, 12 m level, temperature and relative humidity as starting node and ending node values (Coimbatore). The computational domain is rectangular, 550 km in the horizontal and 2000 m height. In order to resolve the frontal movement reasonably well, we discretize the domain into 91 × 91 rectangular bi-quadratic elements with an effective horizontal grid spacing of 2 km, spanning a length of 30 km inland from the shore.
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来源期刊
Chaos Solitons & Fractals
Chaos Solitons & Fractals 物理-数学跨学科应用
CiteScore
13.20
自引率
10.30%
发文量
1087
审稿时长
9 months
期刊介绍: Chaos, Solitons & Fractals strives to establish itself as a premier journal in the interdisciplinary realm of Nonlinear Science, Non-equilibrium, and Complex Phenomena. It welcomes submissions covering a broad spectrum of topics within this field, including dynamics, non-equilibrium processes in physics, chemistry, and geophysics, complex matter and networks, mathematical models, computational biology, applications to quantum and mesoscopic phenomena, fluctuations and random processes, self-organization, and social phenomena.
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