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 Rus. J. Nonlin. Dyn., 2021, Volume 17, Number 2, Pages 195–209 (Mi nd750)

Nonlinear engineering and robotics

Incorporation of Fluid Compressibility into the Calculation of the Stationary Mode of Operation of a Hydraulic Device at High Fluid Pressures

T. Raedera, V. A. Tenenevab, A. A. Chernovaa

a Kalashnikov Izhevsk State Technical University, ul. Studencheskaya 7, Izhevsk, 426069 Russia
b Udmurt Federal Research Center UB RAS, ul. Tatiany Baramzinoi 34, Izhevsk, 426067 Russia

Abstract: This paper is concerned with assessing the correctness of applying various mathematical models for the calculation of the hydroshock phenomena in technical devices for modes close to critical parameters of the fluid. We study the applicability limits of the equation of state for an incompressible fluid (the assumption of constancy of the medium density) to the simulation of processes of the safety valve operation for high values of pressures in the valve. We present a scheme for adapting the numerical method of S. K. Godunov for calculation of flows of incompressible fluids. A generalization of the method for the Mie – Grüneisen equation of state is made using an algorithm of local approximation. A detailed validation and verification of the developed numerical method is provided, and relevant schemes and algorithms are given. Modeling of the hydroshock phenomenon under the valve actuation within the incompressible fluid model is carried out by the openFoam software. The comparison of the results for the weakly compressible and incompressible fluid models allows an estimation of the applicability ranges for the proposed schemes and algorithms. It is shown that the problem of the hydroshock phenomenon is correctly solved using the model of an incompressible fluid for the modes characterized by pressure ratios of no more than 1000 at the boundary of media discontinuity. For all pressure ratios exceeding 1000, it is necessary to apply the proposed weakly compressible fluid approach along with the Mie – Grüneisen equation of state.

Keywords: hydraulic device, mathematical model, numerical simulation, Godunov’s method, Mie – Grüneisen equation of state, water, weakly compressible fluid approach, incompressible fluid

 Funding Agency Grant Number Ministry of Education and Science of the Russian Federation AAAA-A19-119092690104-4 This work was performed as part of the research project of the Udmurt Federal Research Center of the Ural Branch of the Russian Academy of Sciences “Artificial Intelligence in the Development, Training, and Support of Expert Systems for Presentation and Use of Knowledge in Natural, Engineering, and Socio-Humanitarian Sciences” AAAA-A19-119092690104-4.

DOI: https://doi.org/10.20537/nd210205

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MSC: 35Q30, 76-10, 76N15
Accepted:13.06.2021
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Citation: T. Raeder, V. A. Tenenev, A. A. Chernova, “Incorporation of Fluid Compressibility into the Calculation of the Stationary Mode of Operation of a Hydraulic Device at High Fluid Pressures”, Rus. J. Nonlin. Dyn., 17:2 (2021), 195–209

Citation in format AMSBIB
\Bibitem{RaeTenChe21} \by T. Raeder, V. A. Tenenev, A. A. Chernova \paper Incorporation of Fluid Compressibility into the Calculation of the Stationary Mode of Operation of a Hydraulic Device at High Fluid Pressures \jour Rus. J. Nonlin. Dyn. \yr 2021 \vol 17 \issue 2 \pages 195--209 \mathnet{http://mi.mathnet.ru/nd750} \crossref{https://doi.org/10.20537/nd210205} \scopus{https://www.scopus.com/record/display.url?origin=inward&eid=2-s2.0-85109430918}