Introduction
This tutorial examines fluid flow through a two-dimensional channel,
where one wall of the channel has a user-defi ned temperature pro lfie
applied to it. The purpose of this tutorial is to demonstrate the
ability of FLUENT to use user-de fined functions (UDFs) to specify a
position-dependent variable on the wall boundary condition
Introduction
This tutorial examines the flow of liquid metal through a two
dimensional channel. The viscosity of the liquid metal is modeled as a
function of the temperature using a user-defi ned function
Problem Description
The problem considered in this tutorial is shown schematically in
Figure. As the symmetry condition is imposed at the centerline, only
half the channel is modeled, The wall of the channel is split into two
parts: wall-2, which has a temperature of 280 K and wall-3 which has a
temperature of 290 K. The temperature-dependent viscosity of the liquid
metal will respond to this change in wall temperature. The
function, named cell viscosity, is defi ned on a cell using DEFINE
PROPERTY. Two real variables are introduced: temp, the value of
C_T(cell, thread), and mu, the laminar viscosity computed by the
function. The value of the tempertaure is checked, and based upon the
range into which it falls, the appropriate value of mu is computed. At
the end of the function, the computed value for mu is returned to the
solver
Welcome to the world of CFD