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Lattice Boltzmann method for natural convection

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Old   February 25, 2021, 17:33
Default Lattice Boltzmann method for natural convection
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Jesper
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Hi all,

Currently I am developing a hybrid melting/solidification model in Python using the Lattice Boltzmann method (LBM) for the flow and a finite difference scheme for temperature. The basic model without melting is almost finished, except for one error that I narrowed down to the flow part. For this part bounce-back boundary conditions are used. I checked everything in this code, but cannot seem to find anything out of order. The velocity should form a vortex, however the velocity in the x-direction is an order of magnitude too low.
I added diagrams of the velocity, density and temperature in a cavity with a hot and cold wall and adiabatic BCs at the top and bottom. The flow is developed.

Does somebody know what might go wrong by looking at the results? I know it is a long shot, but it will help me a great deal if it works. Thanks!

Regards,
Jesper





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boundary condition, lattice boltzmann method, lbm, natural convection

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