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Title: Introduction to Interface Tracking in Multi-Material Flow Simulations


No abstract provided.

  1. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
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Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
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Resource Type:
Technical Report
Country of Publication:
United States
97 MATHEMATICS AND COMPUTING; Mathematics; Interface Tracking, Multi-material simulations

Citation Formats

Garimella, Rao Veerabhadra. Introduction to Interface Tracking in Multi-Material Flow Simulations. United States: N. p., 2017. Web. doi:10.2172/1367800.
Garimella, Rao Veerabhadra. Introduction to Interface Tracking in Multi-Material Flow Simulations. United States. doi:10.2172/1367800.
Garimella, Rao Veerabhadra. 2017. "Introduction to Interface Tracking in Multi-Material Flow Simulations". United States. doi:10.2172/1367800.
title = {Introduction to Interface Tracking in Multi-Material Flow Simulations},
author = {Garimella, Rao Veerabhadra},
abstractNote = {No abstract provided.},
doi = {10.2172/1367800},
journal = {},
number = ,
volume = ,
place = {United States},
year = 2017,
month = 6

Technical Report:

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  • In this project we implement material interface reconstruction into a large, massively parallel Monte Carlo particle transport code. Here we examine the benefit of resolving a material interface for criticality calculations. Input to the code is a mesh with material and density defined on the mesh. For mesh zones that contain more than one material (mixed zones), the old approximation made in the code is to homogenize the material properties of all the materials in the zone. The neutron mean free path is a function of the material density that the neutron is traveling through, so for mixed zones, wemore » use the average density of the zone, rather than reconstructing a material interface, determining which material within the zone the particle is in and using the correct density based on the position of the particle within the zone. In order to get a better answer, here we implement material interface reconstruction and rather than homogenizing the materials in a mixed zone, we have a material interface divide the zone so we can tell which material the particle is in, based on the particle's position and the location of the material interface.« less
  • No abstract prepared.
  • Research is continuing on the effects of thermal properties of the cutting tool and workpiece on the overall temperature distribution. Using an Eulerian finite element model, diamond and steel tools cutting aluminum have been simulated at various, speeds, and depths of cut. The relative magnitude of the thermal conductivity of the tool and the workpiece is believed to be a primary factor in the resulting temperature distribution in the workpiece. This effect is demonstrated in the change of maximum surface temperatures for diamond on aluminum vs. steel on aluminum. As a preliminary step toward the study of ductile flow inmore » brittle materials, the relative thermal conductivities of diamond on polycarbonate is simulated. In this case, the maximum temperature shifts from the rake face of the tool to the surface of the machined workpiece, thus promoting ductile flow in the workpiece surface.« less
  • We review some of the classic numerical techniques used to analyze contact discontinuities and compare their effectiveness. Several finite difference methods (the Lax-Wendroff method, a Multidimensional Positive Definite Advection Transport Algorithm (MPDATA) method and a Monotone Upstream Scheme for Conservation Laws (MUSCL) scheme with an Artificial Compression Method (ACM)) as well as the finite element Streamlined Upwind Petrov-Galerkin (SUPG) method were considered. These methods were applied to solve the 2D advection equation. Based on our results we concluded that the MUSCL scheme produces the sharpest interfaces but can inappropriately steepen the solution. The SUPG method seems to represent a goodmore » balance between stability and interface sharpness without any inappropriate steepening. However, for solutions with discontinuities, the MUSCL scheme is superior. In addition, a preliminary implementation in a GPU program is discussed.« less
  • In the past two decades great strides have been made in the reduction of direct discharges of contaminants to surface waters (both freshwater and marine systems). Aquatic systems that have been the beneficiary of such abatement have shown improvements in water quality and biotic community integrity. In virtually all instances, however, the system recovery has been incomplete; surveillance and monitoring efforts continue to demonstrate the presence and impact of toxic substances. Problems of toxicity to aquatic organisms, disruption of ecosystem structure and functioning, and bioaccumulation of toxic substances in aquatic food chains are still being identified for both metals andmore » organic chemicals. (Copyright (c) 1994 CRC Press.)« less