Modeling Unsteady Compressible Flow

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Introduction
In this tutorial, FLUENT's coupled implicit solver is used to predict the time-dependent

ow through a two-dimensional nozzle. As an initial condition for the transient problem,
a steady-state solution is generated to provide the initial values for the mass
ow rate at
the nozzle exit.

Prerequisites
This tutorial assumes that you are familiar with the menu structure in FLUENT and that
you have completed Tutorial 1 . Some steps in the setup and solution procedure will not
be shown explicitly.

Problem Description
The geometry to be considered in this tutorial is shown in Figure 4.1. Flow through a
simple nozzle is simulated as a 2D planar model. The nozzle has an inlet height of 0.2 m,
and the nozzle contours have a sinusoidal shape that produces a 10% reduction in
ow
area. Due to symmetry, only half of the nozzle is modeled.