Numerical Study of Turbulent Heat Transfer from Confined Impinging Jets Using aPseudo-Compressibility Method

摘要

A numerical investigation is carried out to predict the turbulent fluid flow andheat transfer characteristics of two-dimensional single and three impinging slot jets. Two low-Reynolds-number kappa-epsilon models, are considered in the simulation. A cell-centered finite-volume scheme combined with an artificial compressibility approach is employed to solve the flow equations, using a diagonally dominant alternating direction implicit (DDADI) time integration method. A fully upwinded second order spatial differencing is adopted to approximate the convective terms. Roe's damping term is used to calculate the flux on the cell face. A multigrid method is utilized for the acceleration of convergence. On average, the heat transfer coefficients predicted by both models show good agreement with the experimental results.