Fluid Dynamics Experiments for Planetary Interiors

Bars, Michaël Le; Barik, Ankit; Burmann, Fabian; Lathrop, Daniel P.; Noir, J.; Schaeffer, Nathanaël; Triana, S. A.

doi:10.1007/s10712-021-09681-1

Cited by 18 publications

(9 citation statements)

References 146 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…7 Compilation of current approximate pressure-temperature capabilities of static high-pressure, hightemperature experimental equipment Mandea 2008). The theory of liquid convection in fast rotating planetary spherical shells is behind these variations, as also discussed in Le Bars et al (2021). For a fluid shell with a positive temperature gradient imposed between inner and outer core boundary, convection starts as columns outside the tangent cylinder (i.e., Inner Core Boundary, ICB) parallel to the Earth rotation axis (see Fig.…”

Section: Magnetic Field Observations Providing Information On the Corementioning

confidence: 99%

Structure, Materials and Processes in the Earth’s Core and Mantle

et al. 2022

View full text Add to dashboard Cite

This paper reviews current knowledge about the Earth’s core and the overlying deep mantle in terms of structure, chemical and mineralogical compositions, physical properties, and dynamics, using information from seismology, geophysics, and geochemistry. High-pressure experimental techniques that can help to interpret and understand observations of these properties and compositions in the deep interior are summarized. The paper also examines the consequences of core flows on global observations such as variations in Earth’s rotation and orientation or variations in the Earth’s magnetic field. Processes currently active at the core-mantle boundary and the various coupling mechanisms between the core and the mantle are discussed, together with some evidence from magnetic field observations.

show abstract

Section: Magnetic Field Observations Providing Information On the Corementioning

confidence: 99%

Structure, Materials and Processes in the Earth’s Core and Mantle

et al. 2022

View full text Add to dashboard Cite

show abstract

“…In regard to Earth, numerical simulations of the geodynamo [3][4][5] established that MHD processes within the Earth are capable of creating a magnetic field similar to the actual geomagnetic field, including reversals of the dominant dipole component. In addition, there have been many laboratory experiments [6], some of which have shown the growth of a self-generated magnetic field, i.e., a dynamo [7][8][9]. Although numerical simulations have been successful in proving the MHD nature of the geodynamo and experiments have shown a dynamo effect, the fundamental MHD origin of the dominant, quasi-steady geomagnetic dipole field still appear to be a theoretical mystery [10].…”

Section: Introductionmentioning

confidence: 99%

Transition to Equilibrium and Coherent Structure in Ideal MHD Turbulence

Shebalin

2023

Fluids

View full text Add to dashboard Cite

Transition of ideal, homogeneous, incompressible, magnetohydrodynamic (MHD) turbulence to near-equilibrium from non-equilibrium initial conditions is examined through new long-time numerical simulations on a 1283 periodic grid. Here, we neglect dissipation because we are primarily concerned with behavior at the largest scale which has been shown to be essentially the same for ideal and real (forced and dissipative) MHD turbulence. A Fourier spectral transform method is used to numerically integrate the dynamical equations forward in time and results from six computer runs are presented with various combinations of imposed rotation and mean magnetic field. There are five separate cases of ideal, homogeneous, incompressible, MHD turbulence: Case I, with no rotation or mean field; Case II, where only rotation is imposed; Case III, which has only a mean magnetic field; Case IV, where rotation vector and mean magnetic field direction are aligned; and Case V, which has nonaligned rotation vector and mean field directions. Dynamic coefficients are predicted by statistical mechanics to be zero-mean random variables, but largest-scale coherent magnetic structures emerge in all cases during transition; this implies dynamo action is inherent in ideal MHD turbulence. These coherent structures are expected to occur in Cases I, II and IV, but not in Cases III and V; future studies will determine whether they persist.

show abstract

“…For planets and moons, it is estimated that E∼Ofalse(10−14false), Ro∼Ofalse(10−5false) and Po∼Ofalse(10−7false) [1]. Such small E are unattainable in laboratory experiments, where the lower limit is E∼Ofalse(10−6false), and the forcing amplitudes are considerably larger in order to have reasonable signal-to-noise ratios [2,3]. The concept of extracting a portion of the available rotational energy in a rapidly rotating contained body of fluid via low-amplitude parametric forcing and converting it into intense fluid motions via the resonant excitation of inertial waves has a long history [4], and continues to be of great interest [5].…”

Section: Introductionmentioning

confidence: 99%

Inertial wave attractors in rapidly rotating tilted cuboids

Welfert

Lopez

2023

Proc. R. Soc. A.

View full text Add to dashboard Cite

Flows in rapidly rotating fluid-filled containers are strongly constrained by the restorative Coriolis force. Their responses to small amplitude perturbations may result in the excitation of regular modes of the container for some very selective geometries, but in general the response is a network of inertial wave beams. Due to the peculiar laws governing how these beams reflect, the network of reflected beams may focus onto highly localized regions of the container, where the beam energy and wavenumber become unbounded in the absence of viscous and nonlinear processes. Here, we explore in detail this focusing of wave beams in cuboids, enabling a comprehensive analysis of this intriguing process.

show abstract

Fluid Dynamics Experiments for Planetary Interiors

Cited by 18 publications

References 146 publications

Structure, Materials and Processes in the Earth’s Core and Mantle

Structure, Materials and Processes in the Earth’s Core and Mantle

Transition to Equilibrium and Coherent Structure in Ideal MHD Turbulence

Inertial wave attractors in rapidly rotating tilted cuboids

Contact Info

Product

Resources

About