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Updated: Mar 19, 2026

Measuring Material Microstructure Under Flow Using 1-2 Plane Flow-Small Angle Neutron Scattering
Published on: February 6, 2014
Pressure anisotropy and small spatial scales induced by velocity shear
D Del Sarto1, F Pegoraro2, F Califano2
1Institut Jean Lamour, UMR CNRS 7198 and Université de Lorraine, B.P. 70239, F-54506 Vandœuvre-lès-Nancy Cedex, France.
Abstract:
By including the full pressure tensor dynamics in a fluid plasma model, we show that a sheared velocity field can provide an effective mechanism that makes the initial isotropic pressure nongyrotropic. This is distinct from the usual gyrotropic anisotropy related to the fluid compressibility and usually accounted for in double-adiabatic models. We determine the time evolution of the pressure agyrotropy and discuss how the propagation of "magnetoelastic perturbations" can affect the pressure tensor anisotropization and its spatial filamentation, which are due to the action of both the magnetic field and the flow strain tensor. We support this analysis with a numerical integration of the nonlinear equations describing the pressure tensor evolution.
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