Stabilized Explicit Time Integration for Parallel Air Quality Models

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dc.contributor.authorSrivastava, Anuragen
dc.contributor.committeechairSandu, Adrianen
dc.contributor.committeememberRibbens, Calvin J.en
dc.contributor.committeememberTafti, Danesh K.en
dc.contributor.departmentComputer Scienceen
dc.date.accessioned2014-03-14T20:44:06Zen
dc.date.adate2006-11-09en
dc.date.available2014-03-14T20:44:06Zen
dc.date.issued2006-08-18en
dc.date.rdate2006-11-09en
dc.date.sdate2006-08-24en
dc.description.abstractAir Quality Models are defined for prediction and simulation of air pollutant concentrations over a certain period of time. The predictions can be used in setting limits for the emission levels of industrial facilities. The input data for the air quality models are very large and encompass various environmental conditions like wind speed, turbulence, temperature and cloud density. Most air quality models are based on advection-diffusion equations. These differential equations are moderately stiff and require appropriate techniques for fast integration over large intervals of time. Implicit time stepping techniques for solving differential equations being unconditionally stable are considered suitable for the solution. However, implicit time stepping techniques impose certain data dependencies that can cause the parallelization of air quality models to be inefficient. The current approach uses Runge Kutta Chebyshev explicit method for solution of advection diffusion equations. It is found that even if the explicit method used is computationally more expensive in the serial execution, it takes lesser execution time when parallelized because of less complicated data dependencies presented by the explicit time-stepping. The implicit time-stepping on the other hand cannot be parallelized efficiently because of the inherent complicated data dependencies.en
dc.description.degreeMaster of Scienceen
dc.identifier.otheretd-08242006-093842en
dc.identifier.sourceurlhttp://scholar.lib.vt.edu/theses/available/etd-08242006-093842/en
dc.identifier.urihttp://hdl.handle.net/10919/34736en
dc.publisherVirginia Techen
dc.relation.haspartSrivastava_MSthesis_2006_updated.pdfen
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subjectExplicit time-steppingen
dc.subjectRunge Kutta Chebysheven
dc.subjectSTEMen
dc.subjectAir Quality Modelsen
dc.subjectSupercomputingen
dc.subjectParallel Computingen
dc.titleStabilized Explicit Time Integration for Parallel Air Quality Modelsen
dc.typeThesisen
thesis.degree.disciplineComputer Scienceen
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen
thesis.degree.levelmastersen
thesis.degree.nameMaster of Scienceen

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