Book Review: Methods for the Localization of Singularities in Numerical Solutions of Gas Dynamics Problems

AIAA Journal ◽  
1991 ◽  
Vol 29 (6) ◽  
pp. 1026-1026
Author(s):  
G. Moretti
Keyword(s):  
Gas Dynamics ◽  
Numerical Solutions ◽  
Localization Of Singularities ◽  
Gas Dynamics Problems ◽  
Dynamics Problems

scholarly journals Flow visualization with strong and weak gas dynamic discontinuities in computational fluid dynamics

2016 ◽  
pp. 245-257
Author(s):  
П.В. Булат ◽  
К.Н. Волков ◽  
М.С. Яковчук
Keyword(s):  
Gas Dynamics ◽  
Numerical Solutions ◽  
Visual Representation ◽  
Gas Flows ◽  
Topological Methods ◽  
Gas Dynamic ◽  
Optical Visualization ◽  
Gas Dynamics Problems ◽  
Dynamics Problems ◽  
Visualization Of Flows

Рассматриваются методы визуализации течений с газодинамическими разрывами, позволяющие проводить сравнение результатов численного моделирования с данными физического эксперимента. Дается обзор методов оптической визуализации течений сжимаемого газа (теневые картины, шлирен-изображения, интерферограммы). Приводятся примеры визуального представления решений ряда задач газовой динамики, связанных с расчетами течений, содержащих слабые и сильные газодинамические разрывы. Для повышения наглядности результирующего образа применяются топологические методы визуализации, позволяющие определить положение критических точек, линий отрыва и присоединения потока. A number of methods for the visualization of flows with gas dynamic discontinuities are considered. These methods allow one to perform the direct comparison of numerical results with experimental data. Methods for the optical visualization of compressible gas flows (shadowgraphs, schlieren images, and interferograms) are discussed. Some examples illustrating the visual representation of numerical solutions of gas dynamics problems related to flows containing weak and strong gas dynamic discontinuities are given. Topological methods of visualization are applied to increase the visual representation of resulting images and to define the locations of critical points as well as the separation and attachment lines.

Neural network approach to solve gas dynamics problems with chemical transformations

2021 ◽  
Vol 180 ◽  
pp. 58-65
Author(s):  
V.B. Betelin ◽  
B.V. Kryzhanovsky ◽  
N.N. Smirnov ◽  
V.F. Nikitin ◽  
I.M. Karandashev ◽  
...  
Keyword(s):  
Neural Network ◽  
Gas Dynamics ◽  
Chemical Transformations ◽  
Network Approach ◽  
Neural Network Approach ◽  
Gas Dynamics Problems ◽  
Dynamics Problems

scholarly journals Modified Method of Adaptive Artificial Viscosity for Solution of Gas Dynamics Problems on Parallel Computer Systems

2018 ◽  
Vol 173 ◽  
pp. 03020 ◽  
Author(s):  
Igor Popov ◽  
Sergey Sukov
Keyword(s):  
Gas Dynamics ◽  
Unstructured Grids ◽  
Computer Experiments ◽  
Artificial Viscosity ◽  
Parallel Computer ◽  
Time Approximation ◽  
Adaptive Artificial Viscosity ◽  
Modified Method ◽  
Gas Dynamics Problems ◽  
Dynamics Problems

A modification of the adaptive artificial viscosity (AAV) method is considered. This modification is based on one stage time approximation and is adopted to calculation of gasdynamics problems on unstructured grids with an arbitrary type of grid elements. The proposed numerical method has simplified logic, better performance and parallel efficiency compared to the implementation of the original AAV method. Computer experiments evidence the robustness and convergence of the method to difference solution.

Investigation of the influence of boundary conditions in the numerical solution of a vortex tube model

2019 ◽  
Vol 14 (2) ◽  
pp. 89-100
Author(s):  
M.R. Minibaev ◽  
C.I. Mikhaylenko
Keyword(s):  
Boundary Conditions ◽  
Turbulent Flows ◽  
Gas Dynamics ◽  
Vortex Tube ◽  
Computational Simulation ◽  
Ideal Gas ◽  
Tube Model ◽  
Gas Dynamics Problems ◽  
Dynamics Problems ◽  
Physical Quantities

The applicability of various boundary conditions in the computational simulation of a Ranque–Hilsch vortex tube is investigated. A review of existing works on the effect of geometry and various thermodynamic parameters on the efficiency of the pipe is made. The substantiation of the possibility of introducing additional computational domains when moving the boundaries to study the influence of boundary conditions when modeling gas dynamics problems is given. To simulate the dynamics of a gas in a vortex tube, a mathematical model is written that includes the Navier–Stokes system of equations describing a compressible viscous fluid, which is closed by the equation of state of an ideal gas. Existing methods for calculating turbulent flows are considered. The applicability of various semi-empirical models of turbulence for modeling a vortex tube is described. The possibility of using the selected k−ε model and its description is argued. The boundary conditions characteristic of the vortex tube model are described, and the boundary conditions most combined in the simulation of gas dynamics problems are also shown. Presents a grid that takes into account the area formed by the removal of boundaries. The solution is based on the sonicFoam algorithm in the OpenFOAM package. Utilities of the postprocessor are used when preparing the model for calculations on a high-performance cluster and utilities for averaging the obtained physical quantities. The simulation results for different combinations of boundary conditions and models with remote boundaries are given. Comparison of the results obtained. It is shown that the geometrical dimensions have a strong influence on the operation of the pipe; the correct choice of boundary conditions makes it possible to obtain the values of physical quantities that are closest to the known experimental ones. Moving the boundaries away from direct exits provides an opportunity to more accurately estimate the effects that arise near the real boundaries of the vortex tube, especially affecting the magnitude of the Ranque–Hilsch effect.

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