A5045239584- Meteorological Phenomena and Simulations
- Wind and Air Flow Studies
- Fluid Dynamics and Turbulent Flows
- Climate variability and models
- Fire effects on ecosystems
- Atmospheric aerosols and clouds
- Wind Energy Research and Development
- Plant Water Relations and Carbon Dynamics
- Atmospheric and Environmental Gas Dynamics
- Atmospheric chemistry and aerosols
- Tropical and Extratropical Cyclones Research
- Ocean Waves and Remote Sensing
- Fluid Dynamics and Vibration Analysis
- Landslides and related hazards
- Air Quality and Health Impacts
- Heat Transfer Mechanisms
- Atmospheric Ozone and Climate
- Coastal and Marine Dynamics
- Oceanographic and Atmospheric Processes
- Aeolian processes and effects
- Air Traffic Management and Optimization
- Aerodynamics and Fluid Dynamics Research
- Aerospace and Aviation Technology
- Astro and Planetary Science
- Planetary Science and Exploration
NSF National Center for Atmospheric Research
2016-2024
Research Applications (United States)
2016-2024
National Renewable Energy Laboratory
2019
National Oceanic and Atmospheric Administration
2019
Sandia National Laboratories
2019
Los Alamos National Laboratory
2014-2019
Argonne National Laboratory
2019
Lawrence Livermore National Laboratory
2019
American Meteorological Society
2019
Yonsei University
2019
Despite the variety of existing methods, efficient generation turbulent inflow conditions for large-eddy simulation (LES) models remains a challenging and active research area. Herein, we extend our previous on cell perturbation method, which uses novel stochastic approach based upon finite amplitude perturbations potential temperature field applied within region near boundaries LES domain [Muñoz-Esparza et al., “Bridging transition from mesoscale to microscale turbulence in numerical...
Abstract Accurately representing flow across the mesoscale to microscale is a persistent roadblock for completing realistic simulations. The science challenges that must be addressed coupling at these scales include following: 1) What necessary capture variability of flow, and how do we avoid generating spurious rolls within terra incognita between scales? 2) Which methods effectively couple correct nonstationary features microscale? 3) are best initialize turbulence 4) way handle...
Abstract Multiscale modeling of a diurnal cycle real‐world conditions is presented for the first time, validated using data from CWEX‐13 field experiment. Dynamical downscaling synoptic‐scale down to resolved three‐dimensional eddies in atmospheric boundary layer (ABL) was performed, spanning 4 orders magnitude horizontal grid resolution: 111 km 8.2 m (30 m) stable (convective) conditions. Computationally efficient mesoscale‐to‐microscale transition made possible by generalized cell...
Realistic multiscale simulations involve coupling of mesoscale and large-eddy simulation (LES) models, thus requiring efficient generation turbulence in nested LES domains. Herein, we extend our previous work on the cell perturbation (CP) method to nonneutral atmospheric boundary layers (ABLs). A modified Richardson number scaling is proposed determine amplitude potential temperature perturbations stable ABLs, with [Formula: see text] −1.0 overall providing optimum transition a fully...
Abstract A better understanding and prediction of turbulence dissipation rate ε in the atmospheric boundary layer (ABL) is important for many applications. Herein, sonic anemometer data from Experimental Planetary Instrumentation Assessment (XPIA) field campaign (March–May 2015) are used to derive energy (EDR; =) within first 300 m above ground employing second-order structure functions. Turbulence found be strongly driven by diurnal evolution ABL, presenting a distinct statistical behavior...
This paper is focused on the evaluation of five planetary boundary layer (PBL) schemes in Weather Research and Forecasting model for offshore wind energy purposes. One first order scheme: Yonsey University four one-and-a-half schemes: Mellor-Yamada-Janić, Quasi-Normal Scale Elimination, Mellor-Yamada-Nakanishi-Niino, Bougeault-Lacarrère, are considered. Turbulent flux measurements from FINO1 platform North Sea used to estimate Obukhov length, allowing sorting data into different stability...
Abstract Multiscale atmospheric simulations can be computationally prohibitive, as they require large domains and fine spatiotemporal resolutions. Grid‐nesting alleviate this by bridging mesoscales microscales, but one turbulence scheme must run at resolutions within a range of scales known the terra incognita (TI). TI grid‐cell sizes violate both mesoscale microscale subgrid‐scale parametrization assumptions, resulting in unrealistic flow structures. Herein we assess impact lateral boundary...
Abstract This paper introduces a new large‐eddy simulation model, FastEddy®, purpose built for leveraging the accelerated and more power‐efficient computing capacity of graphics processing units (GPUs) toward adopting microscale turbulence‐resolving atmospheric boundary layer simulations into future numerical weather prediction activities. Here basis endeavors with FastEddy® model is provided by describing dry dynamics formulation investigating several validation scenarios that establish...
Recent computational and modeling advances have led a diverse community to experiment with atmospheric boundary layer (ABL) simulations at subkilometer horizontal scales. Accurately parameterizing turbulence these scales is complex problem. The solutions proposed date are still in the development phase remain largely unvalidated. This work assesses performance of methods currently available Weather Research Forecasting (WRF) model represent ABL gray-zone grid spacing 333 m. We consider three...
Wind plant blockage reduces wind velocity upstream of plants, reducing the power generated by turbines adjacent to inflow, and potentially throughout as well. The nature mechanism that amplifies well reductions in both induction zone deeper into array are not understood. Field observations can provide valuable insight characteristics mechanisms amplify it. However, relatively small have been measured experimentally pose a challenge quantifying blockage, especially onshore environments with...
The influence of surface forcings driven by realistic land cover and properties remains underexplored in microscale turbulence-resolving weather simulations, especially within urban settings. Atmospheric models often rely on coarse property datasets (typically ranging from 500 m to 10 km), but their low resolution frequently fails adequately capture critical local heterogeneities. Building-resolving large-eddy simulations (LESs) that incorporate detailed characteristics offer a powerful...
High-resolution simulations, both at mesoscale and microscale, have become increasingly prevalent, often leveraging high-resolution terrain datasets. However, terrain-following coordinate models can encounter numerical instabilities in regions where slopes exceed critical thresholds, generally around 35º. To address this issue, smoothing is typically required. Current approaches usually involve applying global methods across the entire domain, which inevitably results a loss of...
Abstract The level‐set method is typically used to track and propagate the fire perimeter in wildland models. Herein, a high‐order using fifth‐order WENO scheme for discretization of spatial derivatives third‐order explicit Runge‐Kutta temporal integration implemented within Weather Research Forecasting model physics package, WRF‐Fire. algorithm includes solution an additional partial differential equation reinitialization. accuracy fire‐front shape rate spread uncoupled simulations...
Abstract A multiscale modeling study of a real case has been conducted to explore the capability large-eddy simulation version Weather Research and Forecasting Model (WRF-LES) over Xiaohaituo Mountain (a game zone for Beijing, China, 2022 Winter Olympic Games). In comparing WRF-LES results with observations collected during Terrain Atmospheric Observations Modeling (MOUNTAOM) field campaign, it is found that at 37-m resolution LES settings, model can reasonably capture both large-scale...
Wildland fires are responsible for large socio-economic impacts. Fires affect the environment, damage structures, threaten lives, cause health issues, and involve suppression costs. These impacts can be mitigated via accurate fire spread forecast to inform incident management team. We show that a system based on numerical weather prediction (NWP) model coupled with wildland behavior provide this forecast. This was illustrated Chimney Tops II The run at high horizontal resolution (111 m) over...
Abstract. Two-way feedback occurs between offshore wind and waves. However, the influence of waves on profile remains understudied, in particular momentum transfer sea surface atmosphere. Previous studies showed that for swell it is possible to have increasing speeds case aligned wind–wave directions. opposite valid opposed directions, where a decrease velocity observed. Up now, this behavior has not been included most numerical models due lack an appropriate parameterization resulting...
Abstract. The sensitivities of idealized large-eddy simulations (LESs) to variations model configuration and forcing parameters on quantities interest wind power applications are examined. Simulated speed, turbulent fluxes, spectra cospectra assessed in relation two physical factors, geostrophic speed surface roughness length, several choices, including mesh size grid aspect ratio, turbulence model, numerical discretization schemes, three different code bases. Two case studies representing...
Abstract A large midlatitude cyclone occurred over the central United States from 0000 to 1800 UTC 30 April 2017. During this period, there were more than 1100 reports of moderate-or-greater turbulence at commercial aviation cruising altitudes east Rocky Mountains. Much was located above or, otherwise, outside synoptic-scale cloud shield cyclone, thus complicating its avoidance. In study we use two-way nesting in a numerical model with finest horizontal spacing 370 m investigate possible...
Abstract. Large eddy simulations (LESs) are performed for the area of Caribbean island Barbados to investigate effects on boundary layer modification, cloud generation and vertical mixing aerosols. Due presence a topographically structured surface in domain center, model setup has be designed with open lateral boundaries. In order generate inflow turbulence consistent upstream marine forcing, we use cell perturbation method based finite amplitude potential temperature perturbations. this...