Linear and nonlinear simulations of the visco-resistive internal kink mode using the M3D code

2018 ◽  
Vol 58 (10) ◽  
pp. 106035 ◽  
Author(s):  
Wei Shen ◽  
Francesco Porcelli
Keyword(s):  
Kink Mode ◽  
Nonlinear Simulations ◽  
Linear And Nonlinear

Linear and Nonlinear Simulations Using the EUTERPE Gyrokinetic Code

2010 ◽  
Vol 38 (9) ◽  
pp. 2119-2128 ◽  
Author(s):  
Edilberto Sanchez ◽  
Ralf Kleiber ◽  
Roman Hatzky ◽  
Alejandro Soba ◽  
Xavier Saez ◽  
...  
Keyword(s):  
Nonlinear Simulations ◽  
Linear And Nonlinear

scholarly journals Nonlinear gyrokinetic PIC simulations in stellarators with the code EUTERPE

2020 ◽  
Vol 86 (5) ◽  
Author(s):  
E. Sánchez ◽  
A. Mishchenko ◽  
J. M. García-Regaña ◽  
R. Kleiber ◽  
A. Bottino ◽  
...  
Keyword(s):  
Linear Growth ◽  
Collision Operator ◽  
Zonal Flow ◽  
Linear Growth Rate ◽  
Plasma Parameters ◽  
Particle In Cell ◽  
Nonlinear Simulations ◽  
Flow Evolution ◽  
Linear And Nonlinear

In this work, the first nonlinear particle-in-cell simulations carried out in a stellarator with the global gyrokinetic code EUTERPE using adiabatic electrons and realistic plasma parameters are reported. Several studies are conducted with the aim of enabling reliable nonlinear simulations in stellarators with this code. First, EUTERPE is benchmarked against ORB5 in both linear and nonlinear settings in a tokamak configuration. Next, the use of noise control and stabilization tools, a Krook-type collision operator, markers’ weight smoothing and heating sources is investigated. It is studied in detail how these tools influence the linear growth rate of instabilities in both tokamak and stellarator geometries, and their influence on the linear zonal flow evolution in a stellarator. Then, it is studied how these tools allow improvement of the quality of the results in a set of nonlinear simulations of electrostatic turbulence in a stellarator configuration. Finally, these tools are applied to a W7-X magnetic configuration using experimental plasma parameters.

Comparison of linear and nonlinear simulations of bidirectional pig contact forces in gas pipelines

2015 ◽  
Vol 27 ◽  
pp. 151-157 ◽  
Author(s):  
Xiaoxiao Zhu ◽  
Deguo Wang ◽  
Hoi Yeung ◽  
Shimin Zhang ◽  
Shuhai Liu
Keyword(s):  
Contact Forces ◽  
Gas Pipelines ◽  
Nonlinear Simulations ◽  
Linear And Nonlinear

Linear and Nonlinear Optical Properties of Natural Dyes Freestanding Films and Application in Optical Limiting

2020 ◽  
pp. 139-143
Keyword(s):  
Absorption Coefficient ◽  
Water Solution ◽  
Optical Limiting ◽  
Refraction Index ◽  
Laser Wavelength ◽  
Solid State Laser ◽  
Natural Dyes ◽  
Linear And Nonlinear ◽  
532 Nm ◽  
Absorbance Spectra

Natural dyes were followed and prepared from a pomegranate, purple carrot, and eggplant peel. The absorbance spectra was measured in the wavelength range 300-800 nm. The linear properties measurements of the prepared natural dye freestanding films were determined include absorption coefficient (α0), extinction coefficient (κ), and linear refraction index (n). The nonlinear refractive index n2 and nonlinear absorption coefficient β2 of the natural dyes in the water solution were measured by the optical z-scan technique under a pumped solid state laser at a laser wavelength of 532 nm. The results indicated that the pomegranate dye can be promising candidates for optical limiting applications with significantly low optical limiting of 3.5 mW.

Rheological characterization of tack and viscoelasticity of compositions of crepe coating used in the Yankee dryer

TAPPI Journal ◽  
2019 ◽  
Vol 18 (11) ◽  
pp. 641-649
Author(s):  
JOSHUA OMAMBALA ◽  
CARL MCINTYRE
Keyword(s):  
Normal Force ◽  
Weight Ratio ◽  
Good Combination ◽  
Rheological Characterization ◽  
Nonlinear Viscoelastic ◽  
Coating Composition ◽  
Linear And Nonlinear ◽  
Work Done ◽  
Tissue Production

The vast majority of tissue production uses creping to achieve the required set of properties on the base sheet. The Yankee coating helps to develop the desired crepe that in turn determines properties such as bulk and softness. The adhesion of the sheet to the Yankee surface is a very important characteristic to consider in achieving the desired crepe. The coating mix usually consists of the adhesive, modifier, and release. A good combination of these components is essential to achieving the desired properties of the tissue or towel, which often are determined by trials on the machine that can be time consuming and lead to costly rejects. In this paper, five compositions of an industrial Yankee coating adhesive, modifier, and release were examined rheologically. The weight ratio of the adhesive was kept constant at 30% in all five compositions and the modifier and release ratios were varied. The normal force and work done by the different compositions have been shown at various temperatures simulating that of the Yankee surface, and the oscillatory test was carried out to explain the linear and nonlinear viscoelastic characteristic of the optimal coating composition.

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