Effect of shaping on turbulent dynamics in reversed-field pinch simulations
| Autor: | Kai Schneider, Robert Chahine, Wouter J. T. Bos |
|---|---|
| Přispěvatelé: | Laboratoire de Mecanique des Fluides et d'Acoustique (LMFA), École Centrale de Lyon (ECL), Université de Lyon-Université de Lyon-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Institut National des Sciences Appliquées de Lyon (INSA Lyon), Université de Lyon-Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS), Institut de Mathématiques de Marseille (I2M), Aix Marseille Université (AMU)-École Centrale de Marseille (ECM)-Centre National de la Recherche Scientifique (CNRS), European Project: 633053,H2020,EURATOM-Adhoc-2014-20,EUROfusion(2014) |
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
Physics
Reversed field pinch Mechanics Condensed Matter Physics 01 natural sciences 010305 fluids & plasmas Magnetic field symbols.namesake Physics::Plasma Physics 0103 physical sciences Pinch symbols Magnetic pressure Lundquist number [PHYS.MECA.MEFL]Physics [physics]/Mechanics [physics]/Fluid mechanics [physics.class-ph] Magnetohydrodynamics 010306 general physics Lorentz force Pressure gradient |
| Zdroj: | Journal of Plasma Physics Journal of Plasma Physics, 2021, 87 (6), ⟨10.1017/S0022377821001094⟩ |
| ISSN: | 0022-3778 1469-7807 |
| DOI: | 10.1017/S0022377821001094⟩ |
| Popis: | We study the influence of the shape of the plasma container on the dynamics of the reversed-field pinch (RFP). The geometries we consider are periodic cylinders with elliptical and circular-shaped cross-sections. Numerical simulations of fully nonlinear viscoresistive magnetohydrodynamics are carried out to illustrate how the plasma dynamics is affected by shaping. It is shown that independent of the plasma shape, the quantity $\beta$ , comparing the hydrodynamic pressure to the magnetic pressure, decreases for increasing values of the Lundquist number, but the pressure gradient fluctuations remain roughly constant, when compared to the Lorentz force. Different elliptical shapes of the cross-section of the domain lead to the excitation of different toroidal (or axial) magnetic and dynamic modes. Furthermore, it is found that in a geometry with circular cross-section, a significant local poloidal angular momentum is observed, absent in the geometries with elliptical cross-section. Because the confinement is dominantly determined by plasma movement, and the dynamics of the velocity and magnetic field are modified by the modification of the geometry, shaping can thus affect the performance of RFP devices. |
| Databáze: | OpenAIRE |
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