Numerical simulation of oscillatory processes in a model channel with two partitions filled with hydrogen

This article discusses the propagation of a sound wave in a channel with a rectangular cross-section with two fiberglass partitions. The time dependences of pressure and displacements for points located in different parts of the model channel are obtained. Hydrogen and air are considered as the working media. An algorithm has been developed for solving the boundary value problem of the numerical simulation of oscillatory processes in the model’s channel with a rectangular cross-section, taking into account the bidirectional interaction (2-way Fluid-Structure Interaction or 2FSI reduction) between deformable partitions and the flow of the working environment, using the ANSYS engineering analysis system. A mathematical model corresponding to the boundary value problem has been developed. Initial and boundary conditions are set and control points along the length of the model channel and on fiberglass partitions are selected. The main results of the study are presented in the form of dependences of the amplitude of displacement of the partition and pressure in the working media (air or hydrogen) on time at characteristic points of the channel. It was found that transients in air and hydrogen differ in amplitude and frequency of oscillation; the dependence of the influence of the number of partitions on fluctuations in the gaseous medium was found. The considered system can become a model for working out the conditions for the occurrence of self-oscillations for different working environments. Predicting the behavior of the pipeline structure, in a model representation, under the influence of different gases during transportation will allow us to assess the influence of the transported medium on the acoustic characteristics of the system. The study is highly important for finding areas of noise reduction during the transportation of any gas mixtures through pipelines.