An improved model of traffic force based on CFD in a curved tunnel

An improved correlation for pressure drop in a tunnel under traffic jam using CFD

“…The drag result for two moving vehicles, however, is totally different. It was shown that an increase in vehicle space or a decrease in vehicle velocity leads to an increase in drag coefficient (Wang et al, 2014). In curved tunnels, it was found that as the radius of curvature of the tunnel reduces, the drag coefficient of a moving vehicle as well as the traffic force induced in the tunnel rises (Wang et al, 2011).…”

Investigation of the aerodynamic phenomena associated with a long lorry platoon running through a tunnel

“…It was found that the aerodynamic characteristics around the first van were similar to that of a single van, and the aerodynamic forces on the truck behind did not have an obvious change. By performing a numerical study combining a one-dimensional mathematical model and a RANS simulation, (Wang et al, 2014) obtained similar results for the case of a two-vehicle platoon moving in a curved tunnel. They further found that the effective drag coefficient increased with increasing the inter-vehicle spacing but decreased with an increase in the vehicle speed, which was attributed to the influence of vehicle wake on the airflow.…”

Behavior of Piston Wind Induced by Braking Train in a Tunnel

“…In early studies, researchers simulated the airflow field of the piston wind in tunnels by solving Navier-Stokes equations [10][11][12]. The dynamic mesh technique in Fluent can realize the train's movement in the numerical simulation, so researchers adopted it to predict the airflow induced by the moving train in a tunnel [13][14][15][16][17]. In addition, Liu et al [18] used a two-dimensional model to simulate and study the three-dimensional flow of piston wind in a tunnel.…”