Computational Technology for Shell Models of Magnetohydrodynamic Turbulence Constructing
- Authors: Vodinchar G.M1, Feshchenko L.K1
-
Affiliations:
- Institute of Cosmophysical Research and Radio Wave Propagation FEB RAS
- Issue: Vol 23, No 6 (2024)
- Pages: 1665-1697
- Section: Mathematical modeling and applied mathematics
- URL: https://journals.rcsi.science/2713-3192/article/view/271661
- DOI: https://doi.org/10.15622/ia.23.6.4
- ID: 271661
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Abstract
The paper discusses the computational technology for constructing one type of small-scale magnetohydrodynamic turbulence models – shell models. Any such model is a system of ordinary quadratic nonlinear differential equations with constant coefficients. Each phase variable is interpreted in absolute value as a measure of the intensity of one of the fields of the turbulent system in a certain range of spatial scales (scale shell). The equations of any shell model must have several quadratic invariants, which are analogues of conservation laws in ideal magnetohydrodynamics. The derivation of the model equations consists in obtaining such expressions for constant coefficients for which the predetermined quadratic expressions will indeed be invariants. Derivation of these expressions «manually» is quite cumbersome and the likelihood of errors in formula transformations is high. This is especially true for non-local models in which large-scale shells that are distant in size can interact. The novelty and originality of the work lie in the fact that the authors proposed a computational technology that allows one to automate the process of deriving equations for shell models. The technology was implemented using computer algebra methods, which made it possible to obtain parametric classes of models in which the invariance of given quadratic forms is carried out absolutely accurately – in formula form. The determination of the parameter values in the resulting parametric class of models is further carried out by agreement with the measures of the interaction of shells in the model with the probabilities of their interaction in a real physical system. The idea of the described technology and its implementation belong to the authors. Some of its elements were published by the authors earlier, but in this work, for the first time, its systematic description is given for models with complex phase variables and agreement of measures of interaction of shells with probabilities. There have been no similar works by other authors previously. The technology allows you to quickly and accurately generate equations for new non-local turbulence shell models and can be useful to researchers involved in modeling turbulent systems.
About the authors
G. M Vodinchar
Institute of Cosmophysical Research and Radio Wave Propagation FEB RAS
Email: gvodinchar@ikir.ru
Mirnaya St. 7
L. K Feshchenko
Institute of Cosmophysical Research and Radio Wave Propagation FEB RAS
Email: feshenko.lk@yandex.ru
Mirnaya St. 7
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