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Search indexed NASA NTRS and DOE OSTI research on propulsion, heat transfer, battery materials and energy systems. Follow report and document links to the original sources.

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At least 739 records · Page 41
All sourcesNASA NTRSDOE OSTI
DOE OSTI2016

Modeling Parasitic Energy Losses and the Impact of Advanced Tribological Concepts on Fuel Efficiency - Final CRADA Report

Our primary task for this project was to perform FMEP calculations for a broad range of parameters including engine type [spark ignition (SI) or compression ignition (CI)], engine size, engine mode (speed and load), lubricant viscosity, asperity friction, surface finish, oil type (mineral or synthetic), and additive (friction modifier), as discussed previously [1–3]. The actual analysis was limited to a large diesel engine and it included both load and speed dependencies as well as lubricant viscosity and speed.

33 ADVANCED PROPULSION SYSTEMS↗
DOE OSTI2019

An eddy-permitting ocean-sea ice general circulation model (E3SMv0-HiLAT03): Description and evaluation

We document modeling setups and present results for simulated ocean and sea ice climate from a recently developed, intermediate-resolution global ocean-sea ice model [Energy Exascale Earth System Model version 0 configured for High-Latitude Application and Testing at 0.3° resolution (E3SMv0-HiLAT03)]. The horizontal resolution of HiLAT03 ranges from 33 km in the tropics to 8.5 km at high latitudes, with 100 vertical levels. This resolution allows the explicit representation of some mesoscale eddies, particularly at lower latitudes, therefore being named as an “eddy-permitting model”. Analyses are presented based on the output of two 186-yr control simulations forced by modern atmospheric conditions of climatological and inter-annually varying data sets, respectively. Results are compared to available observational data sets and the 1° NCAR model, which has somewhat similar ocean physics but a coarser resolution and an earlier version of the sea ice component. Analyses focus on ocean temperature and salinity fields, ocean dynamics and circulations, sea ice concentrations and thicknesses. The HiLAT03 model does reasonably well in most oceanic aspects evaluated here, especially in ocean meridional heat transport, despite the fact that no explicit eddy parameterization is applied. Many Arctic sea ice features are much improved compared with the 1° NCAR model, but the Antarctic summer sea ice is still generally low in concentrations and thicknesses. In addition, we discuss the prolonged deep convection (“Antarctic prolonged polynya”) over the Southern Ocean in the inter-annually forced case.

54 ENVIRONMENTAL SCIENCES↗
DOE OSTI2019

Agent-Based Transportation Energy Analysis Model: Methodology and Initial Results (CRADA 16155)

This report documents the efforts of Argonne and Exelon researchers to implement an agent-based model of charging demand and infrastructure expansion for the seven-county Chicago metropolitan area. Conducted as a project task under a broad Cooperative Research and Development Agreement (CRADA) between Argonne National Laboratory and Exelon, the project spanned a roughly 15-month time period during which Argonne and Exelon researchers developed a close working relationship. In addition to face-to-face meetings - both at the Laboratory and at Exelon’s offices in Washington, DC - bi-weekly web-enabled meetings and a file-sharing folder facilitated interaction and document sharing among the project team. Team members represented a broad cross-section of skill sets and internal organizations.

33 ADVANCED PROPULSION SYSTEMS↗
DOE OSTI2021

Interactive Mesh Generation and Comparison Tools for Nuclear Energy Advanced Modeling & Simulation Phase I. Final Report

The promise of computer simulations for nuclear reactor designs is the opportunity to speed up the design process while also improving safety, providing more detail and higher fidelity, reducing cost, minimizing schedule risk, and avoiding many other potential problems; because simulations have the potential to be much less expensive and time-consuming than traditional development – where scale models and physical tests require construction and long lead times – it is possible to consider more alternatives and complete more comprehensive assessments before the design is finalized and constructed. As more design scenarios are studied by simulation, the speed that simulations promise is only available as long as bottlenecks are addressed for these scenarios. A frequent bottleneck is the amount of human labor required to describe the shape of the objects being designed and decompose the shape into simple elements, such as hexahedra, that are small enough to capture the physical phenomena of interest without being so small that even fast computers cannot perform the simulation in a reasonable amount of time. Recently, techniques for creating all-hexahedral decompositions have been developed, but they require some human input. Many simulation codes prefer all-hexahedral decompositions, so we proposed to evaluate the feasibility of these techniques on nuclear reactor geometries to see whether they required too much human input to be commercially viable. Our study concluded that they can be made viable with some additional software tools to reduce the amount of user input required.

22 GENERAL STUDIES OF NUCLEAR REACTORS↗
DOE OSTI2019

Efficient partnership models for energy technology startups enabled by artificial intelligence that hyper-targets ecosystem connectivity

PartnerAI is a platform that utilizes the tools of the rapidly advancing field of Artificial Intelligence (AI) to understand and identify the connections between founders and potential partners or investors in the clean energy space. The platform makes use of data science tools, including clustering and NLP libraries, to evaluate scraped text and data, and build a real-time network of potential connections.

99 GENERAL AND MISCELLANEOUS↗
DOE OSTI2022

Nonlinear Optimization and the Modeling of Energy Systems [Slides]

Energy delivery systems are critical for the function of modern society. (Up to) continental-scale engineered systems move energy from source points to consumers. These systems are increasingly complex and interconnected.

32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATI↗
DOE OSTI2025

Modeling Volumetric Energy Deposition-driven Rayleigh-Taylor Instability

The goal of this work is to simulate a volumetric energy deposition (VED) driven Rayleigh-Taylor instability (RTI). Efforts will focus on simulating effects observed in two-fluid VED-driven RTI experiments. The VED triggers the RTI by changing the density of the fluids through time, hence a variable Atwood number is achieved. While initially stable (heavier fluid on the bottom), the microwave heating creates a density inversion and leads to a RTI. We hope to explore the mechanisms in VED-driven RTI and see how initial perturbations change the dynamics of growth. This work will primarily focus on early-time behavior but will also include steps towards simulating late-time nonlinear behavior.

97 MATHEMATICS AND COMPUTING↗
DOE OSTI2020

Urbanization-induced land and aerosol impacts on sea-breeze circulation and convective precipitation

Abstract. Changes in land cover and aerosols resulting from urbanization may impact convective clouds and precipitation. Here we investigate how Houston urbanization can modify sea-breeze-induced convective cloud and precipitation through the urban land effect and anthropogenic aerosol effect. The simulations are carried out with the Chemistry version of the Weather Research and Forecasting model (WRF-Chem), which is coupled with spectral-bin microphysics (SBM) and the multilayer urban model with a building energy model (BEM-BEP). We find that Houston urbanization (the joint effect of both urban land and anthropogenic aerosols) notably enhances storm intensity (by ∼ 75 % in maximum vertical velocity) and precipitation intensity (up to 45 %), with the anthropogenic aerosol effect more significant than the urban land effect. Urban land effect modifies convective evolution: speed up the transition from the warm cloud to mixed-phase cloud, thus initiating surface rain earlier but slowing down the convective cell dissipation, all of which result from urban heating-induced stronger sea-breeze circulation. The anthropogenic aerosol effect becomes evident after the cloud evolves into the mixed-phase cloud, accelerating the development of storm from the mixed-phase cloud to deep cloud by ∼ 40 min. Through aerosol–cloud interaction (ACI), aerosols boost convective intensity and precipitation mainly by activating numerous ultrafine particles at the mixed-phase and deep cloud stages. This work shows the importance of considering both the urban land and anthropogenic aerosol effects for understanding urbanization effects on convective clouds and precipitation.

54 ENVIRONMENTAL SCIENCES↗
NASA NTRS1972

High energy proton model for the inner radiation belt.

Reconsideration of inner radiation belt processes and proton theories. The ability of trapped particles to diffuse across magnetic shells is shown radically to alter the view of magnetospheric processes and to call for such a reconsideration. Inner belt calculations incorporating radial diffusion processes are performed in a manner parametrizing the radial diffusion coefficient. The latter is then varied so as to obtain agreement with experiment. The diffusion coefficient thus obtained is compared with coefficients derived by other means.

Walt, M.↗
NASA NTRS1974

Dissipation of energy in model experiments

Interaction studies of a plasma stream with a magnetic dipole have shown that the thickness of the plasma/field interlayer is considerably greater than the characteristic plasma dimension c/omega sub 0. Broadening of the layer is due to the formation of a collisionless shock wave. To demonstrate collisionless dissipation, the Joulean losses were calculated using the conductivity value obtained from the skin layer thickness. Analysis of the various physical processes showed that the hypothesis of collisionless dissipation of the directional plasma flow is justified.

Podgornyy, I. M.↗