Modelling and analytic studies of sheared flow effects on tearing modes

Chandra, D.; Thyagaraja, A.; Sen, Abhijit; Ham, Christopher; Hender, T. C.; Hastie, R. J.; Connor, J. W.; Kaw, P. K.; Mendonca, J.

doi:10.1088/0029-5515/55/5/053016

Cited by 40 publications

(52 citation statements)

References 23 publications

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“…2 we have showed a typical profile for D res , and since D visc = P r × D res , thus it has the same profile because P r is constant in our model. The eigenvalue version of CUTIE, called Resolvent-CUTIE was used to compute these linear results [7].…”

Section: No Flow Simulationsmentioning

confidence: 99%

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Simulation of the internal kink mode in visco-resistive regimes

Mendonca¹,

Chandra²,

Sen³

et al. 2020

Nucl. Fusion

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We present numerical simulation results of the nonlinear evolution of the (1,1) internal kink mode in the presence of various kinds of equilibrium plasma flows. The present studies are carried out in the framework of a two fluid model to extend our past investigations done with a reduced magneto-hydrodynamic (RMHD) model. Two-fluid effects are found to significantly influence the mode dynamics in a number of different ways. In the linear regime diamagnetic effects in combination with flows provide a synergistic stabilizing influence that also carries over to the nonlinear regime. In addition one observes novel symmetry breaking phenomena in the linear growth rates as well as in the nonlinear saturated states of the mode. Our study also explores the influence of strong viscosity on the mode evolution and finds interesting modifications in the real frequency of the mode in the linear regime.

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Section: No Flow Simulationsmentioning

confidence: 99%

“…due to NBI injection. It is also well known that plasma rotation can modify sawtooth dynamics [4,5,6,7,8]. Experimental observations in NSTX [9,10], JET [11,12], MAST [13], TEXTOR [14] etc.…”

Section: Introductionmentioning

confidence: 99%

Simulation of the internal kink mode in visco-resistive regimes

Mendonca¹,

Chandra²,

Sen³

et al. 2020

Nucl. Fusion

Self Cite

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“…, and [q 0 = 1.4, λ = 2, ρ 0 = 0.74] for the (1,1) and (2,1) cases, respectively [7,16]. Since we prescribe both B 0 , S and q, the profile of η is obtained from the condition that ηj 0 is constant.…”

Section: Model Descriptionmentioning

confidence: 99%

Impact of Micro-Scale Stochastic Zonal Flows on the Macro-Scale Visco-Resistive Magnetohydrodynamic Modes

Moradi

Thyagaraja

2020

Mathematics

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A model is developed to simulate micro-scale turbulence driven ZFs, and their impact on the MHD tearing and kink modes is examined. The model is based on a stochastic representation of the micro-scale ZFs with a given Alfvén Mach number, MS. Two approaches were explored: i) passive stochastic model where the ZFs amplitudes are independent of the MHD mode amplitude, and ii) the semi-stochastic model where the amplitudes of the ZFs have a dependence on the amplitude of the MHD mode itself. The results show that the stochastic ZFs can significantly stabilise the (2,1) and (1,1) MHD modes even at very low kinematic viscosity, P r, where the mode is linearly unstable. Our results, therefore indicate a possible mechanism for stabilisation of the MHD modes via small-scale perturbations in poloidal flow, simulating the turbulence driven ZFs.

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“…Among the developed enteral formulae, the bulk density was in the range of 0.44 g/g (HPEF) to 0.47 g/g (HEEF). The low bulk densities of the ingredients and the developed enteral formula may be due to small particle size of the sample as bulk densities of a product is greatly affected by particle size [24]. The bulk is also affected by protein fractions as protein fractions has lower density than starch granules [25] which could have been a reason for the lowest bulk density of HPEF due to presence of malted green gram flour in higher proportion which is a rich source of protein.…”

Section: Respectivelymentioning

confidence: 99%

Evaluation of Functional Characteristics and Reconstitution Behavior of Formulated Ready to Reconstitute Enteral Formula for Nutrition Therapy

Bordoloi

Bhattacharyya

Gogoi

et al. 2020

IRJPAC

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Aims: The present investigation was undertaken to evaluate the functional properties and reconstitution behavior of enteral formulae i.e. Balanced Enteral Formula, High Protein Enteral Formula and High Energy Enteral Formula formulated using locally available natural ingredients. Place and Duration of Study: The study was conducted in the Department of Food Science and Nutrition, College of Community Science, Assam Agricultural University during the period of August 2017 to January 2018. Methodology: Three enteral formulae namely Balanced Enteral Formula, High Protein Enteral Formula and High Energy Enteral Formula were formulated using naturally available low cost ingredients. Standard protocols were followed to evaluate the quality of ingredients used and formulated enteral formulae. Results: Both ingredients and enteral formulae had good functional properties with bulk density, tapped density, particle density, porosity, cohesiveness, flowability, water absorption index and water solubility index ranging from 0.33 to 0.50 g/ml, 0.38 to 0.56 g/ml, 0.59 to 1.25 g/ml, 35.00 to 60.00per cent, 0.33 to 1.18, 0.00 to 17.77 per cent, 1.23 to 7.59 g/g and 23.66 to 87.62 per cent soluble solids respectively for the ingredients used and 0.44 to 0.47 g/ml; 0.50 to 0.53 g/ml; 0.89 to 0.90 g/ml; 41.00 to 44.44 per cent; 1.12 to 1.14; 11.30 to 12.00 per cent; 3.39 to 4.59 g/g and 42.66 to 51.00 per cent respectively for the formulated enteral formulae. Color analysis of the developed formulae using Hunter Lab showed desirable results with L*, a* and b* value in the range of 82.43 to 87.10; 1.35 to 2.38 and 13.75 to 13.95 respectively. The reconstitution of formulated enteral formulae with warm water revealed a reconstitution time varying from 5 to 6 minutes. Further the reconstituted formula feed on passage through Ryles tube showed superior flow rate in formulae prepared with 20 per cent solid concentration (W/V). Conclusion: The developed enteral formulae had excellent functional characteristics and reconstitution behavior indicating quality product suitable for enteral feeding.

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Modelling and analytic studies of sheared flow effects on tearing modes

Cited by 40 publications

References 23 publications

Simulation of the internal kink mode in visco-resistive regimes

Simulation of the internal kink mode in visco-resistive regimes

Impact of Micro-Scale Stochastic Zonal Flows on the Macro-Scale Visco-Resistive Magnetohydrodynamic Modes

Evaluation of Functional Characteristics and Reconstitution Behavior of Formulated Ready to Reconstitute Enteral Formula for Nutrition Therapy

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