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Cartesian - Astrophysics Data System

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Last Updated: 03 September 2022

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Polynomial algebras of superintegrable systems separating in Cartesian coordinates from higher order ladder operators

One of the gl Lie algebras is that they conserve by designing some portions of the gl Lie algebra's geometry. Various deformations of harmonic oscillator and singular oscillator related to exceptional orthogonal polynomials, as well as Painlev u00e9 and higher order Painlevu00e9 analogs are among the Hamiltonians who have graduated in this framework. We investigate a new three-dimensional superintegrable device related to Hermite's unique orthogonal polynomials of type III, as an exemplified example.

Source link: https://ui.adsabs.harvard.edu/abs/2022PhyD..44033464L/abstract


Solution of the multilayer multigroup neutron diffusion equation in cartesian geometry by fictitious borders power method

A solution for the one-dimensional steady state Multilayer Multigroup Neutron Diffusion Equation in cartesian geometry is presented in this paper, as well as a skeptical Borders Power Method's perturbative evaluation of this technology. The neutron flux is reconstructed by polynomial interpolation for each new iteration of the power method, so it remains in a generic configuration. The last step is to resolve the neutron diffusion equation for each fictitious region in analytical form locally.

Source link: https://ui.adsabs.harvard.edu/abs/2022Kernt..82..232Z/abstract


Magnetic field computer interface based on Cartesian robot for practical demonstration of Ampere's law in precollege courses

For example, electrical circuits and power electronics are important in various engineering careers, for example. However, abstract concepts such as electric or magnetic fields are often difficult to explain without visual aids. Computer programs designed for learning physics fundamentals are highly useful in this field because they enable the visualization, communication, and reinforcement of key concepts in a more effective way than using only blackboard. In this work, an interactive MATLAB-based software to visualize a magnetic field in 3D was introduced.

Source link: https://ui.adsabs.harvard.edu/abs/2022PhyEd..57f5002C/abstract


A computational fluid dynamics-discrete element-immersed boundary method for Cartesian grid simulation of heat transfer in compressible gas-solid flow with complex geometries

With an immersed tube, the CFD-DEM-IBM technique was then used to investigate compressible gas-solid exchange in a bubbling fluidized bed. The results of the maximal local HTC are slightly different from the experimental findings, according to the results. The simulation results showed that the proposed CFD-DEM-IBM method is a quick and effective way to investigate the heat transfer problem in fluidized beds with irregular geometries.

Source link: https://ui.adsabs.harvard.edu/abs/2020PhFl...32j3306Z/abstract


Radiative relativistic magnetohydrodynamic simulations of neutron star column accretion in Cartesian geometry

High luminosity accortion in a radiation pressure dominated, magnetically restricted accaccout column results in a strongly magnetized neutron star accretion column. At a rate of u2243 10-25 kHz, the column structure is remarkably maintained by low-frequency oscillations of the accacculation shock. Both to balance the cooling and to provide vertical pressure against gravity, these oscillations arise because it is vital to redistribute the force released at the time of the accacculation shock by large vertical motions. The loss of internal energy is always attributed to sideways cooling. Photon bubbles form in our simulations and add more spatial detail to the column's diagram, in addition to the vertical oscillations. The time-averaged column structure in our simulations matches the trends in standard 1D stationary simulations, with the exception being that the shock front's time-averaged height is lower due to the improved cooling efficiency of the 2D column shape.

Source link: https://ui.adsabs.harvard.edu/abs/2022MNRAS.515.4371Z/abstract


Turbulent flow simulations of the common research model on Cartesian grids using recursive fitting approach

In this research, we describe a new approach that incorporates the recursive fitting procedure and wall function for the three-dimensional turbulent flow simulation. For the automatic generation of two- and three-dimensional geometries, the Cartesian grid method is used. The wall boundary conditions can be imposed on the wall faces; therefore, the conservation regulations are strictly followed. In addition, using the wall function allows turbulent boundary layers to be accurately recreated. The turbulent flow simulation using the wall function is straightforward because the flow variables at the first cell centroid are used for friction velocity estimation. However, the distance between the body surface and the first cell centroid varies, since cells of different shapes are produced. The surface pressure and skin friction coefficient distributions match those of the reference simulation on a standard body-fitted grid, according to the flow simulation results.

Source link: https://ui.adsabs.harvard.edu/abs/2022JCoPh.46711460S/abstract


A Discontinuous Galerkin Time-Domain Method With Dynamically Adaptive Cartesian Mesh for Computational Electromagnetics

While being highly suitable for adaptive mesh refinement, hierarchical Cartesian grids offer simplicity close to that of grids and the flexibility of unstructured grids. Simulations of electromagnetic wave diffraction over conducting and dielectric cylinders and spheres show that the intended method can achieve good numerical resolution at a lower computational cost relative to uniform meshes. The auxiliary differential equation and recursive convolution algorithms are used for simulations of dispersive media, a local Drude model, and experiments on a cold plasma slab and a plasmonic rod. With further developments of the charge transport systems, plasmonic THz technologies, laser-induced and microwave plasmas, the DGTD-ACM method is expected to be a useful tool for computations of electromagnetic fields in complex geometries for applications to high-frequency electronic circuits, semiconductor-induced and microwave plasmas, as well as laser-induced and microwave plasmas.

Source link: https://ui.adsabs.harvard.edu/abs/2017ITAP...65.3122Y/abstract

* Please keep in mind that all text is summarized by machine, we do not bear any responsibility, and you should always check original source before taking any actions

* Please keep in mind that all text is summarized by machine, we do not bear any responsibility, and you should always check original source before taking any actions