Numerical model of the flow in the exhaust unit "opening - elbow"

The object of research is the unit of the ventilation system, "exhaust opening - elbow." Ventilation systems designed in buildings for various purposes are usually highly branched, leading to significant pressure losses, the largest of which is due to local resistance in duct fitting elements. The design features of the premises and the significant dimensions of the ventilation ducts lead to the need to route the air ducts with fitting elements installed side-by-side. In such cases, one element has a mutual influence on another, with a change in comparison with separate ones, both in the coefficients of local resistance and the total pressure loss, which is not considered when performing aerodynamic calculations nowadays.