TY JOUR TI NUMERICAL SIMULATION OF NONSTATIONARY GAS DYNAMIC CHARACTERISTICS OF GORENJE OF HEPTANE-AIR MIXTURE IN CAVITY OF A PULSE FIRE EXTINGUISHING DEVICE IN ANSYS FLUENT KW ANSYS Fluent KW numerical simulation KW gorenje vapor heptane KW flame front KW gas dynamics KW pulse fire extinguishing device KW Shelkin effect KW temperature field KW pressure dynamics KW computational fluid dynamics JO Scientific and analytical journal «Vestnik Saint-Petersburg university of State fire service of EMERCOM of Russia» AU Ivanov, A.V. PY 2026 IS 2026 PB Saint-Petersburg University of State Fire Service of Emercom of Russia