(375t) Influence of Model Parameters on Runtime and Accuracy of CFD-DEM Simulations of a Prismatic Spouted Bed

Influence of Model Parameters on
CFD-DEM Simulation of a Prismatic Spouted Bed

Thomas Eppinger, Leonard Becker, Felix
Klippel, Oleh Baran, Ravindra Aglave

Spouted beds are very effective gas–solid
or liquid–solid reactors or contactors and are widely used for drying,
granulation, coating or chemical reactions in the pharmaceutical, agricultural,
food or chemical industry. In the prismatic, slot-rectangular configuration
they show some advantages compared to conventional axisymmetric configurations
[1].

In this contribution we are investigating
these kind of reactors/contactors by means of a coupled CFD–DEM approach with a
focus on runtime acceleration techniques since runtime is a major issue for
applying CFD-DEM simulations on industrial scale. In a first step the
numerical results are compared against experimental results [1] in terms of
pressure drop, pressure fluctuation frequencies and solid particle distribution. Then the
effect of geometric simplifications is discussed and finally we show how
different level of coarse graining affects the time-averaged and instantaneous results
as well as the total runtime.

Figure 1: Particle velocity in a dense spouting bed

Figure 2: Pressure drop fluctuations for a
simulation with and without coarse graining

[1] Salikov V. et al., Characterization and
CFD-DEM modelling of a prismatic spouted bed (2015), Pow.Tech (270), 622-636