ME309 – Fluid Mechanics Laboratory

Introduction to Computational Fluid Dynamics

Report Prepared By:

Silp Udomthaveedej

Tyler Kuhn

Satvik Thaker

October 12, 2012

Abstract

This experiment aids the understanding of developing and fully-developed laminar flows in a pipe with the utilization of Computational Fluid Dynamics (CFD) software ANSYS FLUENTTM. Velocity profiles at various axial locations along the pipe are computed for both developed and fully developed flow cases. These profiles are then compared to the results derived from the Navier-Stoke’s equations for the fully developed case. This is an entirely computer based experiment hence the materials required are restricted to software. The ANSYS FLUENTTM program is required with an additional 2-Dimensional Axisymmetric Pipe Mesh. The necessary parameters are the inlet velocities at the various given Reynold’s numbers. The scaled developing flow pipe mesh, proper boundary conditions, shear conditions and velocity magnitude lead to a bundle of computation at particular Reynolds number, which eventually lead to graphical analysis of wall shear stress, axial velocity (developing and fully developed) and pressure drop. The scatterplot of a developing axial velocity is specifically defined whereas the scatterplot of the fully developed axial velocity resembles a smooth parabola. The percentage of error of pressure drop is higher than the percentage of error of wall shear stress computation. Thus, the boundary conditions must be altered in order to obtain a minimal deviation. The pressure drop and wall shear stress are linearly proportional to the Reynolds number, so similar changes are evident between them, exhibiting the importance of Reynolds number in this experiment.

Introduction

This experiment is an introduction to computational fluid dynamics using a simulation software namely ANSYS FLUENTTM. Two cases of laminar flow in a pipe will be examined and analyzed: developing and fully...