TY JOUR TI CFD SIMULATION OF FLUID FLOW IN AN OPTIMIZED TEE KW ventilation KW energy saving in ventilation KW symmetrical tee KW optimized tee KW local resistance coefficient KW pressure loss reduction KW computational fluid dynamics KW numerical modeling JO Bulletin of Belgorod State Technological University named after. V. G. Shukhov AU Elistratova, Y.V. AU Kryukov, I.V. AU Uvarov, V.A. AU Koverina, V.Y. PY 2026 IS 11 PB Belgorod State Technological University named after V.G. Shukhov