[ { "id": "https://authors.library.caltech.edu/records/0ztd0-8ez38", "eprint_id": 97654, "eprint_status": "archive", "datestamp": "2023-08-19 10:19:38", "lastmod": "2023-10-18 16:10:55", "type": "book_section", "metadata_visibility": "show", "creators": { "items": [ { "id": "Guerrero-P", "name": { "family": "Guerrero", "given": "Pablo" } }, { "id": "Mikellides-I-G", "name": { "family": "Mikellides", "given": "Ioannis G." } }, { "id": "Polk-J-E", "name": { "family": "Polk", "given": "James E." } }, { "id": "Meiron-D-I", "name": { "family": "Meiron", "given": "Daniel I." }, "orcid": "0000-0003-0397-3775" }, { "id": "Lobbia-R-B", "name": { "family": "Lobbia", "given": "Robert B." } } ] }, "title": "Determination of the work function distribution of a LaB_6 hollow cathode based on plasma potential measurement and 2D plasma numerical simulation", "ispublished": "unpub", "full_text_status": "public", "note": "\u00a9 2018 American Institute of Aeronautics and Astronautics.", "abstract": "Self-heating hollow cathodes are central components in modern electric thrusters. The plasma discharge inside these devices heats the internal components, thus maintaining the temperatures required for electron emission. Precise knowledge of the physical phenomena governing hollow cathode operation is key to predict their lifetime, specifically, their thermionic emission characteristics. A simulation platform has been built to couple plasma and thermal models of the self-heating hollow cathode to produce a self-consistent solution. A self-consistent solution has been found for a LaB_6 hollow cathode operating at 25A and 13 sccm where the work function is assumed to be spatially uniform along the emitter with a value which is allowed to vary as the coupled model iterates to a self-consistent solution. The emitter temperature from the converged solution does not agree with experimental temperature measurements, however. The results of a sensitivity analysis suggest that none of the tolerances in the measurement are responsible for the discrepancy. We hypothesize that either the work function needs to be a function of position along the emitting surfaces or the heat fluxes have been overestimated in the plasma solver.", "date": "2018-07-09", "date_type": "published", "publisher": "AIAA", "place_of_pub": "Reston, VA", "pagerange": "Art. No. 2018-4511", "id_number": "CaltechAUTHORS:20190805-134838581", "isbn": "9781624105708", "book_title": "2018 Joint Propulsion Conference", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:20190805-134838581", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "other_numbering_system": { "items": [ { "id": "2018-4511", "name": "AIAA Paper" } ] }, "doi": "10.2514/6.2018-4511", "resource_type": "book_section", "pub_year": "2018", "author_list": "Guerrero, Pablo; Mikellides, Ioannis G.; et el." }, { "id": "https://authors.library.caltech.edu/records/vpz67-rb434", "eprint_id": 78430, "eprint_status": "archive", "datestamp": "2023-08-20 04:17:59", "lastmod": "2023-10-26 00:05:36", "type": "book_section", "metadata_visibility": "show", "creators": { "items": [ { "id": "L\u00f3pez-Ortega-A", "name": { "family": "L\u00f3pez-Ortega", "given": "A." } }, { "id": "Lombardini-Manuel", "name": { "family": "Lombardini", "given": "M." } }, { "id": "Barton-Philip-T", "name": { "family": "Barton", "given": "P. T." } }, { "id": "Pullin-D-I", "name": { "family": "Pullin", "given": "D. I." } }, { "id": "Meiron-D-I", "name": { "family": "Meiron", "given": "D. I." }, "orcid": "0000-0003-0397-3775" } ] }, "title": "Richtmyer-Meshkov Instability at Solid-Gas Interfaces", "ispublished": "unpub", "full_text_status": "restricted", "note": "\u00a9 2015 Springer International Publishing Switzerland. \n\nThis work was partially supported by the Department of Energy National Nuclear Security Administration under Award Number DE-FC52-08NA28613.", "abstract": "The impact of a shock-wave onto a perturbed interface separating materials of different density and initially at rest in a laboratory frame of reference is described as a Richtmer-Meshkov (RM) flow, following Richtmyer [1], who obtained a numerical solution to the linearized equations for perfect fluids using an impulsive model, and Meshkov [2], who performed shock-tube experiments for gaseous materials.", "date": "2015", "date_type": "published", "publisher": "Springer", "place_of_pub": "Cham, Switzerland", "pagerange": "1131-1136", "id_number": "CaltechAUTHORS:20170621-144124277", "isbn": "978-3-319-16837-1", "book_title": "29th International Symposium on Shock Waves", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:20170621-144124277", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "funders": { "items": [ { "agency": "Department of Energy (DOE) National Nuclear Security Administration", "grant_number": "DE-FC52-08NA28613" } ] }, "local_group": { "items": [ { "id": "GALCIT" } ] }, "contributors": { "items": [ { "id": "Bonazza-Ricardo", "name": { "family": "Bonazza", "given": "Ricardo" } }, { "id": "Devesh-Ricardo", "name": { "family": "Devesh", "given": "Ricardo" } } ] }, "doi": "10.1007/978-3-319-16838-8_54", "resource_type": "book_section", "pub_year": "2015", "author_list": "L\u00f3pez-Ortega, A.; Lombardini, M.; et el." }, { "id": "https://authors.library.caltech.edu/records/x120v-48x50", "eprint_id": 103353, "eprint_status": "archive", "datestamp": "2023-08-22 04:32:33", "lastmod": "2023-10-20 15:57:13", "type": "book_section", "metadata_visibility": "show", "creators": { "items": [ { "id": "L\u00f3pez-Ortega-A", "name": { "family": "L\u00f3pez Ortega", "given": "A." } }, { "id": "Lombardini-M", "name": { "family": "Lombardini", "given": "M." } }, { "id": "Hill-D-J", "name": { "family": "Hill", "given": "D. J." } }, { "id": "Pullin-D-I", "name": { "family": "Pullin", "given": "D. I." } }, { "id": "Meiron-D-I", "name": { "family": "Meiron", "given": "D. I." }, "orcid": "0000-0003-0397-3775" } ] }, "title": "Shock Dynamics for Cylindrical/Spherical Converging Shocks in Elastic-Plastic Solids", "ispublished": "unpub", "full_text_status": "restricted", "keywords": "Mach Number; Plastic Region; Elastic Precursor; Eulerian Description; Converge Shock Wave", "note": "\u00a9 2012 Springer-Verlag Berlin Heidelberg. \n\nThis material is based upon work supported by the Department of Energy National Nuclear Security Administration under Award Number DE-FC52-08NA28613.", "abstract": "The study of cylindrical and spherical converging shock waves propagating in solid materials is relevant to the production of high temperatures and pressures in condensed matter with applications to inertial confinement fusion [1]. However, experimental studies conducted in the area are prone to complications derived from the measurement techniques available and the difficulty of producing a quasi-radially symmetric flow.", "date": "2012", "date_type": "published", "publisher": "Springer", "place_of_pub": "Berlin", "pagerange": "757-763", "id_number": "CaltechAUTHORS:20200520-110119540", "isbn": "978-3-642-25684-4", "book_title": "28th International Symposium on Shock Waves", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:20200520-110119540", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "funders": { "items": [ { "agency": "Department of Energy (DOE)", "grant_number": "DE-FC52-08NA28613" } ] }, "local_group": { "items": [ { "id": "GALCIT" } ] }, "contributors": { "items": [ { "id": "Kontis-K", "name": { "family": "Kontis", "given": "Konstantinos" } } ] }, "doi": "10.1007/978-3-642-25685-1_115", "resource_type": "book_section", "pub_year": "2012", "author_list": "L\u00f3pez Ortega, A.; Lombardini, M.; et el." }, { "id": "https://authors.library.caltech.edu/records/8mekk-rzv62", "eprint_id": 99202, "eprint_status": "archive", "datestamp": "2023-08-22 04:50:55", "lastmod": "2024-01-14 21:59:32", "type": "book_section", "metadata_visibility": "show", "creators": { "items": [ { "id": "Deiterding-R", "name": { "family": "Deiterding", "given": "Ralf" } }, { "id": "Cirak-F", "name": { "family": "Cirak", "given": "Fehmi" } }, { "id": "Mauch-S-P", "name": { "family": "Mauch", "given": "Sean P." } }, { "id": "Meiron-D-I", "name": { "family": "Meiron", "given": "Daniel I." }, "orcid": "0000-0003-0397-3775" } ] }, "title": "A Virtual Test Facility for Simulating Detonation-Induced Fracture of Thin Flexible Shells", "ispublished": "unpub", "full_text_status": "public", "keywords": "Detonation Wave; Ghost Cell; Subdivision Surface; Cohesive Interface; Cartesian Mesh", "note": "\u00a9 2006 Springer-Verlag Berlin Heidelberg.\n\n
Draft - 10.1.1.552.1462.pdf
", "abstract": "The fluid-structure interaction simulation of detonation- and shock-wave-loaded fracturing thin-walled structures requires numerical methods that can cope with large deformations as well as topology changes. We present a robust level-set-based approach that integrates a Lagrangian thin shell finite element solver with fracture and fragmentation capabilities with an Eulerian Cartesian detonation solver with optional dynamic mesh adaptation. As an application example, the rupture of a thin aluminum tube due to the passage of an ethylene-oxygen detonation wave is presented.", "date": "2006", "date_type": "published", "publisher": "Springer", "place_of_pub": "Berlin", "pagerange": "122-130", "id_number": "CaltechAUTHORS:20191009-154212803", "isbn": "978-3-540-34381-3", "book_title": "Computational Science \u2013 ICCS 2006", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:20191009-154212803", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "contributors": { "items": [ { "id": "Alexandrov-V-N", "name": { "family": "Alexandrov", "given": "Vassil N." } }, { "id": "van-Albada-G-D", "name": { "family": "van Albada", "given": "Geert Dick" } }, { "id": "Sloot-P-M-A", "name": { "family": "Sloot", "given": "Peter M. A." } }, { "id": "Dongarra-J", "name": { "family": "Dongarra", "given": "Jack" } } ] }, "doi": "10.1007/11758525_17", "primary_object": { "basename": "10.1.1.552.1462.pdf", "url": "https://authors.library.caltech.edu/records/8mekk-rzv62/files/10.1.1.552.1462.pdf" }, "resource_type": "book_section", "pub_year": "2006", "author_list": "Deiterding, Ralf; Cirak, Fehmi; et el." } ]