Independence of the dynamic grid of finite elements for the calculation of the aerodynamic resistance of linehaul trains
The article investigates the effect of changing the maximum size of the finite element of the dynamic grid on the accuracy of calculating the aerodynamic drag force of a linehaul train. The calculations were performed in the Ansys Fluent environment, which allows modeling air flows and their interac...
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| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Zhytomyr Polytechnic State University
2025-07-01
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| Series: | Технічна інженерія |
| Subjects: | |
| Online Access: | https://ten.ztu.edu.ua/article/view/333668 |
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| Summary: | The article investigates the effect of changing the maximum size of the finite element of the dynamic grid on the accuracy of calculating the aerodynamic drag force of a linehaul train. The calculations were performed in the Ansys Fluent environment, which allows modeling air flows and their interaction with objects, in particular with a linehaul train.
Several variants of finite element grids with different granulations were created for the analysis. Each of the grids was adapted to simulate aerodynamic characteristics under different conditions of movement and speed of the linehaul train. The dynamic grid was chosen because it allows changing the grid structure during simulation, which is important for accurately reflecting complex aerodynamic processes, such as turbulent flows and variable shocks on surfaces.
Calculations were performed for different grid variants, starting with a coarse grid with large elements and gradually increasing its accuracy to finer elements. At each stage, the value of the aerodynamic drag force of the linehaul train was calculated.
Particular attention was paid to the analysis of the dependence of the accuracy of the results on the number of elements in the grid. This made it possible to determine at what number of elements stability is achieved in the calculation results, and a further increase in the number of elements does not lead to a significant improvement in accuracy. The use of methods for selecting the optimal element size allows us to significantly reduce the calculation time, while maintaining high accuracy of the results. Possible methods of optimizing the grid were also considered to reduce the amount of computing resources while maintaining the accuracy of the results. This study allows determining the optimal grid parameters for performing aerodynamic calculations of linehaul trains, in particular for estimating aerodynamic drag, which is important for improving energy efficiency and reducing fuel consumption in transport systems. |
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| ISSN: | 2706-5847 2707-9619 |