Algorithm for Wave-Particle Resonances in Fluid Codes - Final Report

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We review the work performed under LDRD ER grant 98-ERD-099. The goal of this work is to write a subroutine for a fluid turbulence code that allows it to incorporate wave-particle resonances (WPR). WPR historically have required a kinetic code, with extra dimensions needed to evolve the phase space distribution function, f(x, v, t). The main results accomplished under this grant have been: (1) Derivation of a nonlinear closure term for 1D electrostatic collisionless fluid; (2) Writing of a 1D electrostatic fluid code, ''es1f,'' with a subroutine to calculate the aforementioned closure term; (3) derivation of several methods to calculate ... continued below

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1,400 Kilobytes pages

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Mattor, N. March 3, 2000.

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Description

We review the work performed under LDRD ER grant 98-ERD-099. The goal of this work is to write a subroutine for a fluid turbulence code that allows it to incorporate wave-particle resonances (WPR). WPR historically have required a kinetic code, with extra dimensions needed to evolve the phase space distribution function, f(x, v, t). The main results accomplished under this grant have been: (1) Derivation of a nonlinear closure term for 1D electrostatic collisionless fluid; (2) Writing of a 1D electrostatic fluid code, ''es1f,'' with a subroutine to calculate the aforementioned closure term; (3) derivation of several methods to calculate the closure term, including Eulerian, Euler-local, fully local, linearized, and linearized zero-phase-velocity, and implementation of these in es1f; (4) Successful modeling of the Landau damping of an arbitrary Langmuir wave; (5) Successful description of a kinetic two-stream instability up to the point of the first bounce; and (6) a spin-off project which uses a mathematical technique developed for the closure, known as the Phase Velocity Transform (PVT) to decompose turbulent fluctuations.

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1,400 Kilobytes pages

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  • Other Information: PBD: 3 Mar 2000

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  • Report No.: UCRL-ID-138116
  • Grant Number: W-7405-Eng-48
  • DOI: 10.2172/792770 | External Link
  • Office of Scientific & Technical Information Report Number: 792770
  • Archival Resource Key: ark:/67531/metadc733910

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  • March 3, 2000

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  • Oct. 19, 2015, 7:39 p.m.

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  • May 5, 2016, 9:02 p.m.

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Mattor, N. Algorithm for Wave-Particle Resonances in Fluid Codes - Final Report, report, March 3, 2000; California. (digital.library.unt.edu/ark:/67531/metadc733910/: accessed September 24, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.