Acoustic approximation of the governing equations of liquid crystals under weak thermomechanical and electrostatic perturbations

Тип публикации: статья из журнала

Год издания: 2018

Идентификатор DOI: 10.1007/978-3-319-73694-5_17

Аннотация: A simplified mathematical model of thermomechanical behavior of a liquid crystal in nematic phase under weak mechanical and thermal perturbations as a micropolar viscoelastic medium with rotating particles is constructed. This model is based on the assumption that potential energy of elastic deformation depends on four parameters—the change in volume, angle of relative rotation of particles, first invariant of curvature measure and entropy. The heat conduction process is described taking into account the anisotropy of a material due to the difference in coefficients of thermal conductivity along the axis of orientation of particles and in the transverse direction. Influence of electric field on the layer of a liquid crystal is modeled by means of the equations of electrostatics for an inhomogeneous anisotropic medium. In the plane formulation, the parallel computational algorithm is worked out on the basis of splitting method with respect to spatial variables, Godunov's gap decay method, Ivanov's method of constructing finite-difference schemes with controlled dissipation properties and method of straight lines for finding electric field. The algorithm is implemented using the CUDA technology for computer systems with graphics accelerators. Results of computations of wave motions demonstrating the efficiency of proposed method and algorithm are represented. It is shown that the effect of orientational thermoelasticity of a liquid crystal in the form of re-orientation of particles in an inhomogeneous temperature field can only be evident in the presence of tangential stresses at the boundary. The modes of resonance excitation in a liquid crystal at the eigenfrequency of rotational motion of particles are analyzed numerically.

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Издание

Журнал: Advanced Structured Materials

Выпуск журнала: Т.87, №

Номера страниц: 297-341

ISSN журнала: 18698433

Авторы

  • Sadovskii V. (Siberian Branch of the Russian Academy of Sciences,Institute of Computational Modeling)
  • Sadovskaya O. (Siberian Branch of the Russian Academy of Sciences,Institute of Computational Modeling)

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