[Peslia]

Hello there,

i want to simulate the natural depression in a chimney. The known conditions are the inlet-temperatur @ 553K and the mass-flow @ 0.12g/s. Also the Material Properties are known for heat transfer between fluid and chimney walls. The temperature outside should be 288K. The chimney is 8,6m high.

- mesh is valid
- k-o SST - Turbulennce is set
- pref is 101325Pa
- ro,ref is 1,23Kg/m3 (@288K)
- altitude @ +z = 8,6m, becaus hier is the static and piezo pressure equal
- mass flow inlet with given T and mass flow
- pressure outlet @ 0Pa and 288K
- steady
- coupled flow

so i tried a lot of things to achieve a good solution, but the problem is that i receive always backflows into the inner of the chimney. I read something about to define the boundaries with field function, but i dont know how to do this. It would be great if someone has an answer

best regards and thank you a lot