CFD Simulation of the Gas-Operated Weapon Drive Applied to the UK-59 Machine Gun


  • Vu Dinh Tien University of Defence
  • Stanislav Procházka University of Defence
  • Vladimír Horák University of Defence
  • Roman Vítek University of Defence
  • Bui Thanh Phan University of Defence



CFD simulation, ANSYS Fluent, gas-operated weapon, discharge coefficient, propellant gases, gas cylinder


The flow characteristics of propellant gases inside the gas cylinder of the weapon gas-operated mechanism, applied to the UK-59 machine gun, are studied. Computational Fluid Dynamics (CFD) in ANSYS Fluent is used for the simulation of flow through the gas port from the barrel bore to the gas cylinder and back. The study's findings are presented along with the piston law of motion and thermodynamic quantities of gases inside the cylinder, specifically the pressure, temperature, and velocity distribution of gases in the cylinder for various piston displacements. The experiment was carried out to specify the pressure of the gases in the cylinder, as well as the displacement of the piston. The experimentally obtained values are compared to the simulation results with a very good agreement.

Author Biography

Roman Vítek, University of Defence

Department of Weapons and Ammunition


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How to Cite

Tien, V. . D., Procházka, S., Horák, V., Vítek, R., & Phan, B. T. (2022). CFD Simulation of the Gas-Operated Weapon Drive Applied to the UK-59 Machine Gun. Advances in Military Technology, 17(2), 397–410.



Research Paper


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