Comparison of two inlet boundary approaches in numerical simulation of car ventilation outlet flow

• Main Authors: Talanda, Tomáš, Niedoba, Pavel, Lízal, František, Jícha, Miroslav
• Format: Conference Proceeding
• Language: English
• Subjects: Computational fluid dynamics; Computer simulation; Flow velocity; Food processing industry; Kinetic energy; Mathematical models; Model testing; Outlet flow; Slats; Upstream; Velocity distribution; Ventilation
• ISSN: 2100-014X; 2101-6275; 2100-014X
• DOI: 10.1051/epjconf/201611402120

The paper is concerned with the comparison of two inlet boundary approaches of numerical simulations. The first approach is based on the simulation of a sufficiently long duct upstream the area of interest with known volumetric flow rate. The second approach rests on the experimental measurement of the section closer to the area of interest. The experimental measurement provides velocity profile and in addition turbulent intensity compared to the first approach where only a velocity profile can be computed according to known volumetric flow rate. A simplified model of car ventilation outlet was chosen as a test case. The model consists of circular and rectangular duct, area of interest (closing flap, vertical slats and horizontal slats) and outlet box. We have compared the two mentioned inlet boundary approaches for two distinct values of volumetric flow rate for which the experimental data of the section upstream of the area of interest are available. The velocity and the turbulent kinetic energy profiles downstream of the area of interest were chosen as comparative characteristics.