backflow fault in the “Setadvectiondiffusionconvectionboundary”

[POSThu]

Dear all,

I am simulating the indoor thermal airflow field, and I coupled the two distributions. The air is entering the room from the top roof and exhausted at the downward. In the advection diffusion dynamics, these outlets were set as constant pressure outlet by “SetAdvectionDiffusionConvectionBoundary”. However, when there is a backflow on the outlet, the temperature will be increased sharply, which makes the simulation diverged. If you have used CFD software, you may know that there is a function to set the temperature of the outlets. However, I didn’t find similar one function in OpenLB. So is there any measures to solve this problem? You can find the attached image through the link. Thank you.

Best Regards,
Mengqiang

[POSThu]

The image links are

https://ibb.co/9ywgXDD

https://ibb.co/sH0Zr3h

Thank you.

[Adrian]

Temperature boundaries may be created using e.g. setAdvectionDiffusionTemperatureBoundary. Usage examples for this and alternatives are provided in e.g. thermal/porousPlate(2,3)d or thermal/squareCavity(2,3)d.

If this doesn’t help we would need to more closely check your application code to exclude any other problems in the setup.

[Author]

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