This paper investigates flow past a backward-facing step (BFS) in duct at Reynolds number $Re = 5080$ based on height, mean inflow velocity and fluid kinematic viscosity. The configuration matches combustion experiment conducted by Pitz Daily 1983. High-resolution fields are obtained OpenFOAM direct numerical simulation, the field analysed Lagrangian approaches. Trajectories of particles areas ...

A set of large eddy simulations for the free surface backward facing step (FSBFS) are carried out to study wave formation behind step. The volume-of-fluid ghost fluid method is employed capture surface. Previous studies have indicated that physics depend on draught-based Froude number (Fr). For small Fr, rear face (transom) becomes wet, while separates smoothly from transom. Close a critical Fr...

Nanofluid flow over a backward facing step was investigated numerically at low Reynolds number and the heat transfer analyzed reported. Al2O3–H2O nanofluids of different volume fractions (φ = 1–5%) were used as material with uniform flux (UHF) 5000 W/m2 bottom wall for 200–600. The two geometries expansion ratios, 1.9432 3.5. SIMPLE algorithm in finite solver to solve Naiver–Stokes equation. Te...

Numerical solutions of 2-D laminar flow over a backward-facing step at high Reynolds numbers are presented. The governing 2-D steady incompressible Navier–Stokes equations are solved with a very efficient finite difference numerical method which proved to be highly stable even at very high Reynolds numbers. Present solutions of the laminar flow over a backward-facing step are compared with expe...

Predication of reattachment length of separated shear layers in low Reynolds number turbulent flow is a challenging task to evaluate the capabilities of different turbulence models, especially for MEMS applications. Physical significances of backward facing step and its industrial applications were discussed. Flow analysis of backward facing step in 2D as well as in 3D were carried out by using...