In this tutorial, the application of a time dependent boundary condition is demonstrated by applying a sinusoidal motion to a wall. The UBOUND_NODAL subroutine is called on a node-by-node basis for each boundary condition where structural bc is specified as user defined in CFD-ACE-GUI. User subroutines are built as Dynamic Link Libraries (DLL files for Windows) or shared objects (.so files for UNIX platforms). The shared libraries are then linked with CFD-ACE-SOLVER such that a two way communication between the solver and the user defined input is established.

A simple, 2D serpentine duct is used to demonstrate the effects of setting laminar viscosity equal to a function of the x-direction velocity gradient. The viscosity increases with the gradient and thus is a "shear-thickening" fluid. This example uses UOUT to obtain the solution gradients, then UVISC contains the code to calculate and set the viscosity.

In this tutorial, the free surface (VOF) and heat transfer features of CFD-ACE+ are used to model the thermal expansion of a fluid.