Algorithms for Constructing Flow Characteristics of Free Jets Based on the Computational Simulation Results

The purpose of the study, to which this article is devoted, is to develop algorithms designed to assess the parameters of free jets based on the simulation results using computational fluid dynamics methods. The characteristics obtained in this way correspond to the boundaries of liquid flows, which are determined visually in computer vision systems, which allows them to be used for validation of mathematical models, as well as machine learning of neural network models describing the processes under study. The article describes algorithms for constructing a line of maximum velocities of a free jet and its approximation with elliptical sections. At the output of the first algorithm, a curve corresponding to the upper limit of the flow is formed. And at the output of the second algorithm, a three-dimensional figure is formed, covering the main stream of the jet. The results of using the developed methods for processing the movement simulation results of a fire extinguishing agent from a fire monitor under the influence of side wind are presented. The analysis of the built line of maximum velocities showed that it forms the upper boundary of the studied flow. The change of the figure, obtained on the basis of approximation by elliptical sections, in the free jet movement direction corresponds to the experimental results of field tests. The proposed algorithms can be used to solve problems such as: validation of computational fluid dynamics methods used for simulation based on data obtained during field tests or observations using computer vision systems, construction of samples for training and verification of neural network models designed to predict the movement of free liquid jets, assessment of various parameters of free jets, development and debugging of algorithms for control of processes in which free jets are used, in particular, in systems for guidance of fire robots, including in case of disturbances.