**Introduction**

The purpose of this tutorial is to illustrate how to set up and solve a problem using the following two features in FLUENT.

• Moving Deforming Mesh (MDM) using the layering algorithm.

• User-defined real gas law.

The problem involves a projectile moving through a barrel and out of the muzzle. The flow is assumed to be inviscid.

**Problem Description**

A projectile weighing 120 grams is initially at rest inside a 20 mm caliber barrel. The gas inside the chamber is patched at a high pressure of 3000 atm and a temperature of 2700 K, and the projectile is released.

The motion of the projectile is computed using a UDF based
on FLUENT’s Six Degree of Freedom UDF. In this case, only the pressure forces are
considered, while drag and mechanical friction are neglected. The projectile is released at t=0.
The Abel-Nobel equation of state is implemented using the user-defined real gas
model.

**Results**

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