2D Numerical analysis of laminar natural convection heat transfer and flow in square cavity with square obstacles

7TH INTERNATIONAL CONFERENCE ON APPLIED ENGINEERING AND NATURAL SCIENCES ICAENS 2025, Konya, Türkiye, 15 - 16 Mayıs 2025, ss.132, (Özet Bildiri)

In this study, laminar natural convection heat transfer and ternary fluid flow in the presence of

three adiabatic square obstacles differently located in a square cavity is numerically investigated. The

analysis focuses on the effects of the placement and location of the obstacles on the heat transfer. The flow

is assumed to be steady, laminar and incompressible. Two opposite lateral walls of the cavity are heated

and cooled respectively, and the another walls and obstacle surfaces are subjected to adiabatic. The

Rayleigh number is accepted 106. 2D steady state continuity, Navier-Stokes and energy equations along

with the Boussinesq approximation are solved. Numerical solutions are performed with ANSYS Fluent

software using the finite volume method. Spatial discretizations for the gradient, pressure, momentum, and

energy are accepted as Green-Gauss node based, Presto, Second order upwind, respectively. The Simple

algorithm used a relationship between velocity and pressure corrections to apply mass conservation and to

obtain the pressure field is chosen. The convergence criterion is 10-5 for all the equations. The streamlines

and isotherms corresponding to the different obstacle configurations for Rayleigh number studied are

presented and the flow and heat transfer characteristics are detailed.