# Test Case for Addon Courant Number Function Object

## Description

This test case features a rising air bubble in a closed box of stagnant water.
It is designed to have a oscillating phase Courant number for air and runs very
short physical time only.

## Technical Information

- 2D
- parallel (NPROCS = 2)

## Pre-Processing

The bubble is initialized using setFields at (0.25, 0.25) with a radius of 0.51.

For the sake of testing the parallel functionality, the case is decomposed into
two sub-domains.

## Post-Processing

The addonCourantNo functionObject is designed to write out the solution with
the instantaneous field of the phase specific Courant number (with a given flux
 field - in this case air), when the criterion critCo < max(Co) is met.
The selected criterion for addonCourantNo for this test is 0.25.
To track the influence of code development on addonCourantNo, the written field
 of Co(air) is compared to a reference. Both should be identical. Any
 differences are shown in `./Allrun` terminal output.
