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Title: Monte Carlo simulation of neutron porosity oil well logging tools: Combining the geometry-independent fine-mesh importance map and one-dimensional diffusion model approaches

Abstract

The generation of first estimate geometry-independent fine-mesh three-dimensional importance maps with simple one-dimensional diffusion models is demonstrated for the Monte Carlo simulation of the neutron porosity oil well logging tool response benchmark problem. By combining the approach of using simple one-dimensional steady-state diffusion models for calculating neutron adjoint flux with the geometry-independent fine-mesh-based Monte Carlo importance approach previously developed, an automated and efficient variance reduction method is obtained for this specific problem. A surprising result is that the converged figures of merit after iteration are consistently larger when the initial importance map is based on the one-dimensional diffusion model rather than that obtained from an analog Monte Carlo simulation.

Authors:
 [1];  [2]
  1. North Carolina State Univ., Raleigh, NC (United States)
  2. Computalog U.S.A., Inc., Fort Worth, TX (United States)
Publication Date:
Sponsoring Org.:
Los Alamos National Lab., NM (United States)
OSTI Identifier:
687544
Resource Type:
Journal Article
Journal Name:
Nuclear Science and Engineering
Additional Journal Information:
Journal Volume: 133; Journal Issue: 1; Other Information: PBD: Sep 1999
Country of Publication:
United States
Language:
English
Subject:
44 INSTRUMENTATION, INCLUDING NUCLEAR AND PARTICLE DETECTORS; MONTE CARLO METHOD; NEUTRON LOGGING; MESH GENERATION; RESPONSE FUNCTIONS; BENCHMARKS; ADJOINT FLUX; CONVERGENCE; MAPPING; MATHEMATICAL MODELS; ONE-DIMENSIONAL CALCULATIONS

Citation Formats

Gardner, R.P., and Liu, L. Monte Carlo simulation of neutron porosity oil well logging tools: Combining the geometry-independent fine-mesh importance map and one-dimensional diffusion model approaches. United States: N. p., 1999. Web.
Gardner, R.P., & Liu, L. Monte Carlo simulation of neutron porosity oil well logging tools: Combining the geometry-independent fine-mesh importance map and one-dimensional diffusion model approaches. United States.
Gardner, R.P., and Liu, L. Wed . "Monte Carlo simulation of neutron porosity oil well logging tools: Combining the geometry-independent fine-mesh importance map and one-dimensional diffusion model approaches". United States.
@article{osti_687544,
title = {Monte Carlo simulation of neutron porosity oil well logging tools: Combining the geometry-independent fine-mesh importance map and one-dimensional diffusion model approaches},
author = {Gardner, R.P. and Liu, L.},
abstractNote = {The generation of first estimate geometry-independent fine-mesh three-dimensional importance maps with simple one-dimensional diffusion models is demonstrated for the Monte Carlo simulation of the neutron porosity oil well logging tool response benchmark problem. By combining the approach of using simple one-dimensional steady-state diffusion models for calculating neutron adjoint flux with the geometry-independent fine-mesh-based Monte Carlo importance approach previously developed, an automated and efficient variance reduction method is obtained for this specific problem. A surprising result is that the converged figures of merit after iteration are consistently larger when the initial importance map is based on the one-dimensional diffusion model rather than that obtained from an analog Monte Carlo simulation.},
doi = {},
journal = {Nuclear Science and Engineering},
number = 1,
volume = 133,
place = {United States},
year = {1999},
month = {9}
}