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December 25, 2020, 14:12 |
Solid-Liquid Pipe Flow
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#1 |
New Member
AJ
Join Date: Feb 2020
Location: United Kingdom
Posts: 20
Rep Power: 6 |
Hello,
I am simulating the solid-liquid flow in a horizontal pipe using the Eulerian-Eulerian approach. Details are as follows: Pipe length: 2m Pipe diameter: 40 mm Liquid phase: Sugar Solution (Average velocity: 0.72m/s, density: 1140kg/m3 and viscosity: 0.0044 kg/m-s) Solid phase: Alginate beads (Average velocity: 0.74m/s, size: 2mm, density: 1150kg/m3 and volume fraction:0.063) When I use the k-Epsilon model it predicts solid distribution very well but not velocity profile (underestimate at the center of pipe), whereas if I use the SST model it predicts velocity profile very well but not solid distribution (overestimate at center). Do you know how can I resolve this issue? Thank you |
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December 26, 2020, 06:24 |
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#2 |
Super Moderator
Glenn Horrocks
Join Date: Mar 2009
Location: Sydney, Australia
Posts: 17,852
Rep Power: 144 |
The turbulence models provided with CFX are tuned for single phase flows. So there are no guarantees they will work well for multiphase flows - this is an active area of research and there are many multiphase flows where nobody has designed a good turbulence model for it.
So you will get results like this from time to time. My suggestions are: * Make sure your simulation is converged and grid independent (by a mesh sensitivity check) * Read the CFX documentation on multiphase modelling and especially turbulence modelling in multiphase. There are lots of options available and some of these options might be relevant to you case. * Consider what is the physics by which the particles are affecting the turbulence and the flow, and choose a turbulence model which best captures those physics.
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Tags |
epsilon, eulerian eulerian, pipe flo, solid distribution, sst |
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