73 research outputs found
“Diagnostic of the Solar Atmosphere trhough Two Level Doppler and Magnetic Measurements
No full textin pres
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ITOUGH2 V3.2 verification and validation report
No full textThis report describes the Verification and Validation (V and V) test cases performed to qualify ITOUGH2 V3.2. ITOUGH2 V3.2 was installed in a directory {approximately}/itough2v3.2 on a SUN ULTRA 1 workstation under UNIX Solaris 2. Instructions for installing ITOUGH2 can be found in file read.me and the user`s manual. This report is structured as follows: for each functional requirement, the corresponding design is described, which may include the mathematical model implemented in ITOUGH2 V3.2, if appropriate. Next, the author discusses the test case or sequence of test cases performed to validate each requirement, followed by a description of the test results and their compliance with the acceptance criteria. ITOUGH2 simulates fluid flow in fractures
Steifenlose Lasteinleitung in warmgewalzte I-Träger = Load transmission on unstiffend hot rolled I-Beams
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TOUGH Symposium 2003, Proceedings 2.0 (CD-ROM)
No full textA Symposium on applications and enhancements of the TOUGH family of numerical simulators was held May 12-14, 2003, at the Lawrence Berkeley National Laboratory (Berkeley Lab). As in previous TOUGH Workshops held at Berkeley Lab in 1990, 1995, and 1998, the TOUGH Symposium 2003 was organized as an open forum for information exchange among developers and users of the TOUGH family of nonisothermal multiphase flow simulators. Lectures were given and posters presented covering various application areas, including geothermal reservoir engineering, nuclear waste isolation, vadose zone and fracture flow hydrology, environmental remediation, mining engineering, carbon sequestration and hydrocarbon recovery, reactive transport, and others. Over 90 participants from 14 countries attended the three-day event, during which 60 technical papers were presented. The Symposium was concluded with a panel discussion and followed by a three-day TOUGH2 training course attended by 22 participants. This CD-ROM contains the papers (in PDF format) that were presented at the TOUGH Symposium 2003. The proceedings papers are also accessible through the Symposium Website at http://www esd.lbl.gov/TOUGHsymposium. The CD-ROM also includes papers from the 1995 and 1998 TOUGH Workshops. The papers compiled in these Proceedings demonstrate both the growing sophistication of the TOUGH codes, as well as the diversity of their applications. For example, there are papers on new developments in coupling thermal, hydrological, chemical, mechanical, and biological processes, advances in inverse modeling and optimization, and the increased use of high-performance computing methodologies. The use of TOUGH in classical application areas (such as nuclear waste isolation, geothermal reservoir engineering, and environmental remediation) has matured and now includes large site-scale models of considerable complexity. Furthermore, TOUGH appears to be flexible enough to address emerging scientific and engineering challenges, such as those related to geologic carbon sequestration or methane gas hydrate production problems. Innovative developments in pre- and postprocessing further enhance the utility of the code. We hope these proceedings will provide useful information for individuals and organizations interested in nonisothermal multiphase flow problems in permeable media. The Organizing Committee wishes to thank the session chairs, keynote speakers, presenters, and members of the panel for their contributions to the Symposium. The support fro m various agencies and offices for the development and application of the TOUGH codes is greatly appreciated. Given the widespread interest in TOUGH demonstrated during the Symposium, we are confident that TOUGH will continue to play an important role as both a research code and a simulation tool for practical applications in various areas of subsurface science and engineering. Berkeley, July 2003, The Organizing Committee, Stefan Finsterle, George J. Moridis, Curtis M. Oldenburg, Yu-Shu W
Water Upconing in Underground Hydrogen Storage: Sensitivity Analysis to Inform Design of Withdrawal
No full textThe gas–water interface in Underground Hydrogen Storage (UHS) reservoirs creates the possibility that water will upcone to the well during hydrogen (H2) withdrawal with detrimental impacts. We study the upconing of water to a hydrogen injection/withdrawal (I/W) well using both an analytical solution and numerical simulation. We carried out sensitivity analyses of the engineered properties (e.g., distance of well bottom to gas–water interface, withdrawal rate) and the intrinsic properties (e.g., reservoir permeability, porosity) of an idealized UHS system. Horizontal permeability is the main parameter controlling the height of upconing. Daily I/W cycles to some degree mitigate upconing because injection pushes down the gas–water interface. Sampling-based global sensitivity analyses show clearly that reservoirs with large horizontal permeability are preferred for avoiding upconing. Minimizing withdrawal rate and maximizing either the distance from well to gas–water interface or the length of the perforated well interval are important engineering controls to minimize upconing
Total Solar Irradiance measured by PREMOS/PICARD
No full textWe report Total Solar Irradiance (TSI) measurements made by the space experiment PREMOS on the French micro satellite PICARD and compare them to other operating TSI space experiments. PREMOS/PICARD is the first SItraceable TSI experiment in space and it confirms the value measured by TIM/SORCE that the solar constant is 1361 W/m2. We discuss the accuracy of absolute and relative measurements of TSI and conclude on the reliability of the TSI composite 1979-2012.We find that over a decade, the relative accuracy is 0.2 W/m2 and that within this uncertainty it cannot be decided whether the solar irradiance in the past solar minimum of 2008 was lower than in the minimum of 1996. Reconstructions back to 1979 have even larger uncertainties
Gossamer roadmap technology reference study for a solar polar mission
No full textA technology reference study for a solar polar mission is presented. The study uses novel analytical methods to quantify the mission design space including the required sail performance to achieve a given solar polar observation angle within a given timeframe and thus to derive mass allocations for the remaining spacecraft sub-systems, that is excluding the solar sail sub-system. A parametric, bottom-up, system mass budget analysis is then used to establish the required sail technology to deliver a range of science payloads, and to establish where such payloads can be delivered to within a given timeframe. It is found that a solar polar mission requires a solar sail of side-length 100 – 125 m to deliver a ‘sufficient value’ minimum science payload, and that a 2. 5μm sail film substrate is typically required, however the design is much less sensitive to the boom specific mass
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