Page 25 - TransAT_Tutorial_Manual

TransAT Tutorial Manual 1.2. Backward Facing Step

1.2 Flow over a Backward Facing Step

1.2.1 Prerequisites
• TransAT

• TransATUI

• Paraview (or Tecplot)

1.2.2 Introduction
Single-phase flow over a backward facing step is simulated. The formation of the vortices when
flowing over an obstacle is of particular interest. The flow conditions are chosen so that the flow
is laminar. The problem is three-dimensional to capture the vortices. The following tutorial also
shows how to decompose a computational domain and modify the blocks in TransAT. The setup
of the case is as follows:

• Domain: 50 mm × 10 mm × 10 mm resolved by a mesh of 100 × 50 × 10 cells.

• The step is defined at 0 ≥ x ≥ 10 mm and 0 ≥ y ≥ 5 mm.

• X Min: inflow, velocity 0.1 m/s, constant velocity inflow.
• X Max: pressure outflow

• Y Min, Y Max and obstacle faces: no–slip walls.

• Z Min and Z Max: symmetry boundaries.

• Fluid: air

• Inflow Reynolds number = 40

1.2.3 Launch TransATUI
• Double-click the TransAT icon on the Desktop.

1.2.4 Opening TransAT window
The first step in creating a new TransAT project is naming said project and giving it a location.

• Click to create a new project

• In the next window, navigate to the folder where the project will be saved

c
Ascomp AG Switzerland 15 Version 5.7