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273 results on '"Nelson, Stacy"'

3. A Quasi-Conforming Embedded Reproducing Kernel Particle Method for Heterogeneous Materials

Author

Schlinkman, Ryan T., Baek, Jonghyuk, Beckwith, Frank N., Nelson, Stacy M., and Chen, J. S.

Subjects
Computer Science - Computational Engineering, Finance, and Science, Mathematics - Numerical Analysis
Abstract

We present a quasi-conforming embedded reproducing kernel particle method (QCE-RKPM) for modeling heterogeneous materials that makes use of techniques not available to mesh-based methods such as the finite element method (FEM) and avoids many of the drawbacks in current embedded and immersed formulations which are based on meshed methods. The different material domains are discretized independently thus avoiding time-consuming, conformal meshing. In this approach, the superposition of foreground (inclusion) and background (matrix) domain integration smoothing cells are corrected by a quasi-conforming quadtree subdivision on the background integration smoothing cells. Due to the non-conforming nature of the background integration smoothing cells near the material interfaces, a variationally consistent (VC) correction for domain integration is introduced to restore integration constraints and thus optimal convergence rates at a minor computational cost. Additional interface integration smoothing cells with area (volume) correction, while non-conforming, can be easily introduced to further enhance the accuracy and stability of the Galerkin solution using VC integration on non-conforming cells. To properly approximate the weak discontinuity across the material interface by a penalty-free Nitsche's method with enhanced coercivity, the interface nodes on the surface of the foreground discretization are also shared with the background discretization. As such, there are no tunable parameters, such as those involved in the penalty type method, to enforce interface compatibility in this approach. The advantage of this meshfree formulation is that it avoids many of the instabilities in mesh-based immersed and embedded methods. The effectiveness of QCE-RKPM is illustrated with several examples.

Published
2023

11. Future Trends in Remote Sensing

Author

Khorram, Siamak, van der Wiele, Cynthia F., Koch, Frank H., Nelson, Stacy A. C., Potts, Matthew D., Khorram, Siamak, van der Wiele, Cynthia F., Koch, Frank H., Nelson, Stacy A. C., and Potts, Matthew D.

Published
2016
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12. Data Processing Tools

Author

Khorram, Siamak, van der Wiele, Cynthia F., Koch, Frank H., Nelson, Stacy A. C., Potts, Matthew D., Khorram, Siamak, van der Wiele, Cynthia F., Koch, Frank H., Nelson, Stacy A. C., and Potts, Matthew D.

Published
2016
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13. Observing Coastal and Ocean Ecosystems

Author

Khorram, Siamak, van der Wiele, Cynthia F., Koch, Frank H., Nelson, Stacy A. C., Potts, Matthew D., Khorram, Siamak, van der Wiele, Cynthia F., Koch, Frank H., Nelson, Stacy A. C., and Potts, Matthew D.

Published
2016
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14. International Laws, Charters, and Policies

Author

Khorram, Siamak, van der Wiele, Cynthia F., Koch, Frank H., Nelson, Stacy A. C., Potts, Matthew D., Khorram, Siamak, van der Wiele, Cynthia F., Koch, Frank H., Nelson, Stacy A. C., and Potts, Matthew D.

Published
2016
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16. Atmospheric Applications of Remote Sensing

Author

Khorram, Siamak, van der Wiele, Cynthia F., Koch, Frank H., Nelson, Stacy A. C., Potts, Matthew D., Khorram, Siamak, van der Wiele, Cynthia F., Koch, Frank H., Nelson, Stacy A. C., and Potts, Matthew D.

Published
2016
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17. Terrestrial Applications of Remote Sensing

Author

Khorram, Siamak, van der Wiele, Cynthia F., Koch, Frank H., Nelson, Stacy A. C., Potts, Matthew D., Khorram, Siamak, van der Wiele, Cynthia F., Koch, Frank H., Nelson, Stacy A. C., and Potts, Matthew D.

Published
2016
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18. Remote Sensing: Past and Present

Author

Khorram, Siamak, van der Wiele, Cynthia F., Koch, Frank H., Nelson, Stacy A. C., Potts, Matthew D., Khorram, Siamak, van der Wiele, Cynthia F., Koch, Frank H., Nelson, Stacy A. C., and Potts, Matthew D.

Published
2016
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19. Data Acquisition

Author

Khorram, Siamak, van der Wiele, Cynthia F., Koch, Frank H., Nelson, Stacy A. C., Potts, Matthew D., Khorram, Siamak, van der Wiele, Cynthia F., Koch, Frank H., Nelson, Stacy A. C., and Potts, Matthew D.

Published
2016
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22. The role of sand erosion in the integrity of process pipe-work

Author

Nelson, Stacy A.

Subjects
622.33819
Abstract

Sand erosion in process pipe-work is one of the key contributors to hydrocarbon leaks in the offshore industry. The parameters influencing the erosion process are numerous and a review of investigations presented in the literature has classified these in terms of particle, fluid and material properties. A review of the mechanistic and empirical erosion models currently available to predict the amount of erosion is also presented. This review highlighted the need for a quantitative investigation into the effect of surface roughness on the erosion process, as this has not been investigated or included in any of the models presented in the literature. The experimental investigations were twofold. The first set of experiments, referred to as the Surface Morphology experiments, utilised optical and scanning electron microscopy (SEM) to investigate the mechanisms of material removal of ductile target materials, when subjected to erosion by sand particles entrained in a liquid medium. Particle impingement was at impact angles oblique (30°) and normal (90°) to the material surface. The second set of experiments, referred to as the Surface Profile experiments, utilised surface profilometry to monitor the changes in the surface profile of mild steel plate specimens, when subjected to erosion at an oblique (30°) impact angle. Fast Fourier Transforms were used to convert the surface profile scans into wave-number spectra, to facilitate better monitoring of the changes in the material surface over the erosion exposure period. Five specimens with initial average surface roughness Ra in the range of 0.7 microm to 1.14 microm were used. The investigation showed that the surface roughness parameter plays a significant role in the erosion process, particularly in the initial stages. The operating conditions of the impinging jet were associated with an equilibrium condition, both for the surface roughness and the eroded depth. As a result, specimens having an initial surface roughness value greater than the equilibrium Rae value showed a decrease in surface roughness, whereas those having an initial value less than the equilibrium value showed an increase in surface roughness. This trend was confirmed by the changes in the amplitudes of the wave-number spectra for each plate, over the erosion period. The eroded depth was greatest for the plate having the smallest absolute difference between the initial Ra value and the equilibrium Rae value. This subsequently decreased as the absolute difference between the initial and equilibrium surface roughness value increased.

Published
2004

25. Future Trends in Remote Sensing

Author

Khorram, Siamak, Koch, Frank H., van der Wiele, Cynthia F., Nelson, Stacy A. C., Khorram, Siamak, Nelson, Stacy A.C., Koch, Frank H., and van der Wiele, Cynthia F.

Published
2012
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29. Introduction

Author

Khorram, Siamak, Koch, Frank H., van der Wiele, Cynthia F., Nelson, Stacy A. C., Khorram, Siamak, Nelson, Stacy A.C., Koch, Frank H., and van der Wiele, Cynthia F.

Published
2012
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30. Data Processing Tools

Author

Khorram, Siamak, Koch, Frank H., van der Wiele, Cynthia F., Nelson, Stacy A. C., Khorram, Siamak, Nelson, Stacy A.C., Koch, Frank H., and van der Wiele, Cynthia F.

Published
2012
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31. Data Acquisition

Author

Khorram, Siamak, Koch, Frank H., van der Wiele, Cynthia F., Nelson, Stacy A. C., Khorram, Siamak, Nelson, Stacy A.C., Koch, Frank H., and van der Wiele, Cynthia F.

Published
2012
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50. Abstract 94: Randomized, Double-blind, Placebo-controlled Phase 1 Study Of Vwf-binding Aptamer, Bb-031: Safety, Tolerability, Pharmacokinetic And Pharmacodynamic Activity In Healthy Volunteers

Author

Nimjee, Shahid M, primary, Wheeler, Debra, additional, Nelson, Stacy, additional, Shea, Richard J, additional, Sullivan, Taegen, additional, Mayer, Christina, additional, Pavliv, Leo, additional, Layzer, Juliana M, additional, Lickliter, Jason, additional, Sullenger, Bruce, additional, Campbell, Bruce, additional, and Becker, Richard C, additional

Published
2023
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