Some areas of the Lanzhou-Xinjiang Railway are accompanied by strong crosswinds all year. The lateral force it generates pose a threat to safe operation railway freight trains. This paper conducts numerical simulation study on three trains under five crosswind angles using CFD method in order aiming at relationship between angle and aerodynamic force. SIMPLE algorithm is used solve Reynolds-ave...

A computational uid dynamics and heat transfer analysis is performed to determine the convection and radiation heat transfer from an impinging ame jet to a plane surface. This paper focuses on analyzing the behavior of an impinging ame jet, including buoyancy e ects, turbulence in uence, and convective and radiative heat transfer processes. The combustion is modeled using a 12-species probabili...

The drops are used to control the descents,  stabilize the bed level, and control the upstream water level in sloping channels with less slope than the ground slope. The current study presents a numerical analysis of hydraulic characteristics in the vertical drop using computational fluid dynamics. At first, the laboratory models were used for verification and choosing the best model of turbule...

Abstract The paper focuses on implementing the wall model developed by Manhart, in Reynolds Averaged Navier - Stokes (RANS) turbulence models used field of Computational Fluid Dynamics (CFD). This considers influence streamwise pressure gradient addition to existing usual CFD codes. In present work, two RANS numerical simulations are carried out using k-ω Shear Stress Transport (SST) an asymmet...

The dependence of mixing efficiency on time-varying forcing is studied by direct numerical simulation (DNS) of Kelvin-Helmholtz (KH) instability. Timedependent forcing fields are designed to mimic a breaking internal wave by solving the equations of motion in a tilted coordinate frame and allowing the tilt angle to vary in time. Mixing efficiency Γc is defined as the ratio of potential energy g...

Abstract The NACA4415 airfoil was numerically simulated with the help of Fluent software to analyze its aerodynamic characteristics. Results are acquired as follows: calculation accuracy is much higher than that XFOIL software; result SST k - ω (sstkw) turbulence model closest experimental value; within a certain range, larger Reynolds number is, lift coefficient and lift-to-drag ratio will be,...

Convective heat transfer and friction factor properties for periodic undulating channels are numerically investigated. The finite volume method (FVM) was used in the numerical study. Three different Reynolds averaged simulation (RANS) based turbulence models, shear stress transport SST k-ω transition model were compared with each other. Two used; first geometry is a sharp corrugated channel 30°...