# Test Case for Disperse Phase turbulence model

## Description

The present case of a 2D rectangular bubble column with monodisperse flow
for testing the disperse phase turbulence model[^1]. Air bubbles are injected
from bottom via a point mass sources. The Reynolds stress of the disperse phase
is scaled with respect to liquid Reynolds stress through the Stokes number.
The Stokes number is calculated considering only the Lagrangian integral time
scale. If the switch 'particleCrossTimeScale' (default true) is set to true,
the eddy particle cross over time is additionally taken into account.

## Setup information

- 2D setup
- steady-state
- Total height = 0.7m
- Total width = 0.15m
- 1250 cells (25 x 50)
- Total simulation time 10 seconds
- CoMax = 0.5
- bubble size is 3mm
- Complete baseline models are used
- Additionally, dispersePhaseZeroEquation model with default settings is used
- The coefficient of Lagrangian integral time scale was
  $C_{T} = \frac{3}{2} C_{\mu}$

## PostProcessing

Disperse phase volume fraction, turbulent kinetic energy and velocity along the
radial direction is plotted.

## Keywords

dispersed multiphase flow, Euler-Euler two-fluid model, turbulent dispersion,
CFD simulation, kinetic theory

## Literature

[^1]: Kamble, V., & Rzehak, R. (2023). Turbulent dispersion modeling in bubbly
      and particulate flows based on kinetic theory. EU deliverable.
      cordis.europa.eu/project/id/955805/results
