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Modelling Two Phase Stirred Tank Reactor Using VOF & Steady State

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Old   March 23, 2023, 07:13
Default Modelling Two Phase Stirred Tank Reactor Using VOF & Steady State
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Hello,

I am currently looking at modelling an unbaffled two phase (air-water) stirred tank reactor using a homogeneous eulerian-eulerian VOF method in FLUENT based on a case study from the literature (DOI:10.1021/ie051021a). I am solving using an implicit method and steady state solution (as opposed to transient and explicit) as the paper managed to model the reactor using steady state.

Other models/solver settings I am also using are: PISO solver for pressure-velocity coupling, standard k-epsilon, first order discretisation schemes for convective terms, PRESTO! for pressure; Modified HRIC for VOF.

When I ran the simulation for different flow speeds ranging (from a-e): 0 RPM, 100 RO, 140 RPM, 195 RPM, 240 RPM, I noticed that the depression of the vortex is too small (as can be seen from contours in ZX plane). Also from the isosurface contours, the air-water interface (for vortex) is wavy when typically in papers it is flat and I do not know why this is.

I have attached some images from my simulation results and the literature paper as a comparison and also my residuals plot (which to me appeared converged). I would appreciate any guidance as I am new to modelling stirred tank reactors.
Attached Images
File Type: png Contours ZX Plane.png (103.3 KB, 17 views)
File Type: png Contours Air Water Interface Isosurface.png (103.3 KB, 15 views)
File Type: png Literature Vortex Contours.png (79.0 KB, 13 views)
File Type: png Residuals Plot (195 RPM).png (42.7 KB, 12 views)
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