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Reply To: Boudnary conditions in couple of Navier-stokes and thermal advection-diffussion

OpenLB – Open Source Lattice Boltzmann Code › Forums › on OpenLB › General Topics › Boudnary conditions in couple of Navier-stokes and thermal advection-diffussion › Reply To: Boudnary conditions in couple of Navier-stokes and thermal advection-diffussion

July 5, 2021 at 9:35 pm #5805
mgaedtke
Keymaster

Hi mengqiang,

the setLocal*Boundary functions are in deed using the regularized boundary formulations. For additional stability, I would suggest using the interpolation versions of those.

For pressure outlets, I recommend to use the local convection boundary for the according temperature field. Make sure to execute the coupling operation on those material numbers as well.

Also check your relaxation time and lattice velocity to be in the stable regime. In Timm Krüger’s book on LBM, there is a chapter on how to choose these parameters consistently.

Best regards,
Max