A5015919898- Meteorological Phenomena and Simulations
- Tropical and Extratropical Cyclones Research
- Climate variability and models
- Ocean Waves and Remote Sensing
- Oceanographic and Atmospheric Processes
- Geophysics and Gravity Measurements
- Atmospheric aerosols and clouds
- Atmospheric chemistry and aerosols
- Methane Hydrates and Related Phenomena
- Image and Signal Denoising Methods
- Underwater Vehicles and Communication Systems
- Electron and X-Ray Spectroscopy Techniques
- Advanced Numerical Methods in Computational Mathematics
- Computational Fluid Dynamics and Aerodynamics
- Air Quality and Health Impacts
- Atmospheric Ozone and Climate
- Integrated Circuits and Semiconductor Failure Analysis
- Fluid Dynamics and Turbulent Flows
- Geological and Geophysical Studies
- Air Quality Monitoring and Forecasting
- Optical measurement and interference techniques
- Fluid Dynamics Simulations and Interactions
- Advancements in Photolithography Techniques
- Target Tracking and Data Fusion in Sensor Networks
- 3D IC and TSV technologies
Oak Ridge National Laboratory
2020-2024
Kongju National University
2023
Hanyang University
2022
Pukyong National University
2010-2018
Abstract A scalable semi‐implicit barotropic mode solver for the ocean component of model prediction across scales has been implemented as a competitor to an existing explicit‐subcycling scheme allow faster and more stable simulations while not sacrificing accuracy. The adopts pipelined preconditioned bi‐conjugate gradient stabilization algorithm iterative in conjunction with restricted additive Schwarz preconditioner that accelerates convergence rate solver. is constructed from linearized...
Eigensolutions of the spherical Laplacian operator on cubed‐sphere and icosahedral (‐hexagonal) grid were investigated. For grid, was discretized with Spectral Element Method (SEM) using Lagrange–Legendre Polynomials (LLP), while, for Finite Difference (FDM) employed. The discrete formulated into matrix equations respect to unknowns global‐domain grid‐point values. eigenvalues exhibited a step‐function‐like behaviour: there are 2 n + 1 identical (degenerate) degree , total wave‐number‐like...
Abstract The Fourier finite-element method (FFEM) on the sphere, which performs with an operation count of O(N2 log2N) for 2N × N grids in spherical coordinates, was developed using linear basis functions. Dependent field variables are expanded series longitude, and coefficients represented a first-order finite elements. Different types pole conditions were incorporated into scalar vector order to avoid discontinuity at poles. For Laplacian operator, element defined as function sine latitude...
The bogussing method was further developed by incorporating the asymmetric component into symmetric bogus tropical cyclone of Structure Adjustable Balanced Vortex (SABV). is separated from disturbance field associated with establishing local polar coordinates whose center location cyclone. relative importance wave components in azimuthal direction evaluated, and only two or three large amplitude are added to components. Using Weather Research Forecast model (WRF), initialized vortex, track...
Abstract A high-order spectral filter for the spherical-surface limited-area domain, either window or sector type, is presented, where domain finite both in longitude and latitude longitude, but ranged from Pole to latitude. The data given physical are extended by padding artificial that appropriate decomposition with half-ranged Fourier series. equation of Laplacian operator type was split into first- second-order spherical elliptic equations as global filter. Each low-order discretized...
The angular momentum transport of an idealized axisymmetric vortex in the developing stage was investigated using Weather Research and Forecast (WRF) model. balanced constructed based on empirical function for tangential wind, temperature, geopotential, surface pressure were obtained from equation. numerical simulation carried out 6 days f-plane with Sea Surface Temperature (SST) set as constant. weak at initial time intensified time, reached strength tropical cyclone a couple days. Absolute...
We demonstrate use of a modern Fortran solver interface to manage algorithms for an implicit barotropic mode in the Model Predictions Across Scales-Ocean (MPAS-O). ForTrilinos, Trilinos that contains large collection capabilities written C++, has been implemented MPAS-O provide access suite linear options. By virtue simplified wrapper and generator (SWIG) automation tool generates interfaces C++ code, we were able implement using familiar coding style while minimizing performance...
Abstract. The representation of aerosol activation is a key source uncertainty in global composition-climate model simulations aerosol-cloud interactions. Abdul-Razzak and Ghan (ARG) parameterization used several regional models that employ modal microphysics schemes. In this study, we investigate the ability ARG to reproduce with cloud parcel model, find its performance sensitive geometric standard deviations (widths) lognormal modes. We recommend adjustments three constant parameters...
Abstract. Aerosol-fog interactions affect the visibility in, and life cycle of, fog are difficult to represent in weather climate models. Here we explore processes that impact simulation of droplet number concentrations (Nd) at sub-kilometer scale horizontal grid resolutions UK Met Office Unified Model. We modify parameterization aerosol activation include by radiative cooling addition adiabatic cooling, determine relative importance two mechanisms. further test sensitivity simulated Nd to:...
Abstract. Aerosols influence fog properties such as visibility and lifetime by affecting droplet number concentrations (Nd). Numerical weather prediction (NWP) models often represent aerosol-fog interactions using highly simplified approaches. Incorporating prognostic size-resolved aerosol microphysics from climate could allow them to simulate Nd without incurring excessive computational expense. However, code designed for coarse spatial resolution may struggle with sub-kilometer-scale grid...
Tin (Sn) and Lead (Pb) particles released from the EUV scanner can contaminate mask causing serious yield throughput problems. These contaminants worsen during exposure become difficult to remove, leading damaging in process. To effectively remove without substrate damage, it is necessary understand removal behavior of contaminants. In this study, Sn Pb was studied by simulating heated rapid thermal annealing. The forces between thermally aged surfaces were quantitatively measured using...
Two dimensional finite element method with quadrilateral basis functions was applied to the spherical high order filter on surface limited area domain. The function consists of four shape which are defined separate grid boxes sharing same gridpoint. With functions, first derivative expressed as an algebraic equation associated nine point stencil. As theory depicts, convergence rate error for Laplacian operator found be fourth order, while it second operator. accuracy new shown almost those...
Abstract A high-order filter for a cubed-sphere spectral element model was implemented in three-dimensional dry hydrostatic dynamical core. The core incorporated hybrid sigma–pressure vertical coordinates and third-order Runge–Kutta time-differencing method. global the local-domain filter, requiring numerical operation with huge sparse matrix locally assembled matrix, respectively, were applied to prognostic variables, except surface pressure, at every time step. Performance of evaluated...