Heat Transfer Around a Square Cylinder in Unsteady Flow Regime

Abstract

The project report deals with the analysis of fluid flow phenomena at different conditions utilizing the CFD simulation software ANSYS. This project is to study the simulation and analysis problems that involve fluid flows. First of all we get acquainted with the CFD software. In this project we are using ANSYS-FLUENT for analyzing the mathematical model of a physical problem. Simplifying assumptions are made in order to make the problem tractable (e.g., steady state, incompressible, in viscid, two dimensional). The project consists of two parts. In the first part we observe the lid driven square cavity using water as the material. The work was done for both Newtonian (n=1) and shear-thinning NonNewtonian fluid (n=0.5, k=5). The simulations were carried out at different Reynolds Number (100<Re<1000). The second part is the study of two dimensional unsteady laminar flow of a Newtonian fluid (n=1) across a square cylinder. The study was done with the varying Reynolds Number (90,100 and 120) at Prandlt Number taken to be (0.7, 5, 10, and 20). Having established the limits of the unsteady flow regime Drag and Nusselt Number results are obtained. The values of Drag coefficient, Lift coefficient, Nusselt Number was plotted versus the flow time. The Nusselt Number shows positive dependence on both the Reynolds Number and Prandlt Number. The streamline pattern and isothermal pattern was also shown.