An implicit Smooth Particle Hydrodynamic code

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An implicit version of the Smooth Particle Hydrodynamic (SPH) code SPHINX has been written and is working. In conjunction with the SPHINX code the new implicit code models fluids and solids under a wide range of conditions. SPH codes are Lagrangian, meshless and use particles to model the fluids and solids. The implicit code makes use of the Krylov iterative techniques for solving large linear-systems and a Newton-Raphson method for non-linear corrections. It uses numerical derivatives to construct the Jacobian matrix. It uses sparse techniques to save on memory storage and to reduce the amount of computation. It is believed ... continued below

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Medium: P; Size: 141 pages

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Knapp, Charles E. April 1, 2000.

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This thesis or dissertation is part of the collection entitled: Office of Scientific & Technical Information Technical Reports and was provided by UNT Libraries Government Documents Department to Digital Library, a digital repository hosted by the UNT Libraries. It has been viewed 37 times , with 5 in the last month . More information about this document can be viewed below.

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Description

An implicit version of the Smooth Particle Hydrodynamic (SPH) code SPHINX has been written and is working. In conjunction with the SPHINX code the new implicit code models fluids and solids under a wide range of conditions. SPH codes are Lagrangian, meshless and use particles to model the fluids and solids. The implicit code makes use of the Krylov iterative techniques for solving large linear-systems and a Newton-Raphson method for non-linear corrections. It uses numerical derivatives to construct the Jacobian matrix. It uses sparse techniques to save on memory storage and to reduce the amount of computation. It is believed that this is the first implicit SPH code to use Newton-Krylov techniques, and is also the first implicit SPH code to model solids. A description of SPH and the techniques used in the implicit code are presented. Then, the results of a number of tests cases are discussed, which include a shock tube problem, a Rayleigh-Taylor problem, a breaking dam problem, and a single jet of gas problem. The results are shown to be in very good agreement with analytic solutions, experimental results, and the explicit SPHINX code. In the case of the single jet of gas case it has been demonstrated that the implicit code can do a problem in much shorter time than the explicit code. The problem was, however, very unphysical, but it does demonstrate the potential of the implicit code. It is a first step toward a useful implicit SPH code.

Physical Description

Medium: P; Size: 141 pages

Notes

OSTI as DE00754046

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  • Other Information: TH: Thesis (Ph.D.); Submitted to Univ. of New Mexico, Albuquerque, NM (US)

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  • Report No.: LA-13685-T
  • Grant Number: W-7405-ENG-36
  • Office of Scientific & Technical Information Report Number: 754046
  • Archival Resource Key: ark:/67531/metadc708380

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  • April 1, 2000

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  • Sept. 12, 2015, 6:31 a.m.

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  • May 6, 2016, 1:29 p.m.

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Knapp, Charles E. An implicit Smooth Particle Hydrodynamic code, thesis or dissertation, April 1, 2000; New Mexico. (digital.library.unt.edu/ark:/67531/metadc708380/: accessed September 20, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.