Eulerian and Lagrangian methods for coherent structure analysis in both computational and experimental data

2013 ◽  
Author(s):  
Melissa Green
Keyword(s):  
Experimental Data ◽  
Structure Analysis ◽  
Coherent Structure ◽  
Lagrangian Methods

scholarly journals Coherent structure analysis of spatiotemporal chaos

2000 ◽  
Vol 61 (2) ◽  
pp. 2095-2098 ◽  
Author(s):  
Peter Jung ◽  
Jichang Wang ◽  
Renate Wackerbauer ◽  
Kenneth Showalter
Keyword(s):  
Structure Analysis ◽  
Coherent Structure ◽  
Spatiotemporal Chaos

scholarly journals A critical comparison of Lagrangian methods for coherent structure detection

2017 ◽  
Vol 27 (5) ◽  
pp. 053104 ◽  
Author(s):  
Alireza Hadjighasem ◽  
Mohammad Farazmand ◽  
Daniel Blazevski ◽  
Gary Froyland ◽  
George Haller
Keyword(s):  
Coherent Structure ◽  
Critical Comparison ◽  
Lagrangian Methods ◽  
Structure Detection

Structure Analysis of a Turbulent Jet by Means of Multiresolution Fluctuating Velocity Decomposition

1999 ◽  
Author(s):  
Hui Li ◽  
Masahiro Takei ◽  
Mitsuaki Ochi ◽  
Yoshifuru Saito ◽  
Kiyoshi Horii
Keyword(s):  
Correlation Analysis ◽  
Shear Layer ◽  
Structure Analysis ◽  
Multiresolution Analysis ◽  
Coherent Structures ◽  
Coherent Structure ◽  
Amplitude Fluctuation ◽  
Turbulent Jet ◽  
Velocity Decomposition ◽  
Auto Correlation

Abstract To evaluate coherent structures in the dimension of time and scale, a new procedure based on the multiresolution analysis and multiresolution auto-correlation analysis is developed in this paper. By analyzing u- and v-components of fluctuating velocity, the coherent structure and its scales can be identified when larger amplitude fluctuation and stronger autocorrelation are appeared at same wavelet level. For a turbulent jet at position of x/d = 6, the larger coherent structures with frequency 39Hz can be deduced around times 0.29, 0.53, 0.6 and 0.67s. This also represent the passing of eddies through the shear layer and concentration of the energy of the flow at these instants.

scholarly journals Fluid transportation and heat transfer analysis of PP/TiO2 nanocomposites in an internal mixer

2019 ◽  
Vol 11 (1) ◽  
pp. 168781401881306
Author(s):  
XZ Zhu ◽  
J Liu ◽  
DP Sun
Keyword(s):  
Heat Transfer ◽  
Viscous Dissipation ◽  
Structure Analysis ◽  
Heat Generation ◽  
Coherent Structure ◽  
Heat Transfer Analysis ◽  
Heat Transfer Characteristics ◽  
Lagrangian Coherent Structure ◽  
Viscous Heat ◽  
Internal Mixer

The internal mixer is an important devise for processing the polymer nanocomposites acting as a chemical reactor. In this article, based on the computational fluid dynamics method, the fluid transportation and heat transfer analysis of sol–gel reaction processing for Polypropylene (PP)/TiO2 nanocomposites in the internal batch mixers with single-winged and two-winged Cam rotors were simulated. First, the Lagrangian coherent structure analysis was used to understand the fluid transport properties in the mixers. Then the effect of rotational speeds (ratios) and barrel temperatures on the heat transfer characteristics in the mixers with different rotors was analyzed. Also, the changes of viscous heating and torques of rotors with different thermal conditions in the mixers were discussed. Especially, the relationship between the fluid transportation and heat transfer characteristics was explored. The results show that a big rotor speed ratio can induce great fluid transportation in the left and right mixer chambers based on the Lagrangian coherent structure analysis, and the fluid near the horseshoe map has great folding effect and temperature magnitude. The viscous dissipation, viscous heat generation, and rotor torques in the mixers increase with increasing the rotational speeds and decrease with increasing the barrel temperatures. The mixer with two-winged rotors has higher average temperature, viscous dissipation, viscous heat generation and the torques of rotors values of reactive fluid than that with single-winged rotors.

scholarly journals Quantification of flows generated by the hydromedusa Aequorea victoria: a Lagrangian coherent structure analysis

2011 ◽  
Vol 435 ◽  
pp. 111-123 ◽  
Author(s):  
K Katija ◽  
WT Beaulieu ◽  
C Regula ◽  
SP Colin ◽  
JH Costello ◽  
...  
Keyword(s):  
Structure Analysis ◽  
Coherent Structure ◽  
Lagrangian Coherent Structure ◽  
Aequorea Victoria

Crystal Structure Analysis

2010 ◽  
Author(s):  
Jenny Pickworth Glusker ◽  
Kenneth N. Trueblood
Keyword(s):  
Crystal Structure ◽  
Experimental Data ◽  
Structure Analysis ◽  
Crystalline State ◽  
Three Dimensional ◽  
Crystal Structure Analysis ◽  
X Rays ◽  
Diffraction Patterns ◽  
The Many ◽  
Types Of Information

This book aims to explain how and why the detailed three-dimensional architecture of molecules can be determined by an analysis of the diffraction patterns obtained when X rays or neutrons are scattered by the atoms in single crystals. Part 1 deals with the nature of the crystalline state, diffraction generally, and diffraction by crystals in particular, and, briefly, the experimental procedures that are used. Part II examines the problem of converting the experimentally obtained data into a model of the atomic arrangement that scattered these beams. Part III is concerned with the techniques for refining the approximate structure to the degree warranted by the experimental data. It also describes the many types of information that can be learned by modern crystal structure analysis. There is a glossary of terms used and several appendixes to which most of the mathematical details have been relegated.

scholarly journals checkCIF validation ALERTS: what they mean and how to respond

2020 ◽  
Vol 76 (1) ◽  
pp. 1-11 ◽  
Author(s):  
Anthony L. Spek
Keyword(s):  
Crystal Structure ◽  
Experimental Data ◽  
Structure Analysis ◽  
Structure Determination ◽  
Crystal Structure Analysis ◽  
Crystal Structure Determination ◽  
Background Information ◽  
Web Based ◽  
Determination Process ◽  
Short Explanation

Authors of a paper that includes a new crystal-structure determination are expected to not only report the structural results of interest and their interpretation, but are also expected to archive in computer-readable CIF format the experimental data on which the crystal-structure analysis is based. Additionally, an IUCr/checkCIF validation report will be required for the review of a submitted paper. Such a validation report, automatically created from the deposited CIF file, lists as ALERTS not only potential errors or unusual findings, but also suggestions for improvement along with interesting information on the structure at hand. Major ALERTS for issues are expected to have been acted on already before the submission for publication or discussed in the associated paper and/or commented on in the CIF file. In addition, referees, readers and users of the data should be able to make their own judgment and interpretation of the underlying experimental data or perform their own calculations with the archived data. All the above is consistent with the FAIR (findable, accessible, interoperable, and reusable) initiative [Helliwell (2019). Struct. Dyn. 6, 05430]. Validation can also be helpful for less experienced authors in pointing to and avoiding of crystal-structure determination and interpretation pitfalls. The IUCr web-based checkCIF server provides such a validation report, based on data uploaded in CIF format. Alternatively, a locally installable checkCIF version is available to be used iteratively during the structure-determination process. ALERTS come mostly as short single-line messages. There is also a short explanation of the ALERTS available through the IUCr web server or with the locally installed PLATON/checkCIF version. This paper provides additional background information on the checkCIF procedure and additional details for a number of ALERTS along with options for how to act on them.

Microdiffraction Patterns of Small Metallic Particles II; Theoretical Analysis

1982 ◽  
Vol 40 ◽  
pp. 668-669
Author(s):  
A. Gómez ◽  
P. Schabes-Retchkiman ◽  
M. José-Yacamán ◽  
T. Ocaña
Keyword(s):  
Experimental Data ◽  
Electron Diffraction ◽  
Theoretical Analysis ◽  
Size Range ◽  
Dynamical Theory ◽  
Metallic Particles ◽  
Splitting Effect

The splitting effect that is observed in microdiffraction pat-terns of small metallic particles in the size range 50-500 Å can be understood using the dynamical theory of electron diffraction for the case of a crystal containing a finite wedge. For the experimental data we refer to part I of this work in these proceedings.

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