Flow behaving strange

[AsimUdel]

Hi @rybchuk ,
I hope you are doing great. I wanted to discuss a problem which I am facing. i think it is flow reversal.
https://github.com/rybchuk/amr-wind-tutorial/blob/main/03_turbines.md, here you explained that if the inflow is aligned in x direction purely, the "both the ylo and the yhi planes in the precursor simulation. Sometimes running with ylo isn't enough because a small amount of flow can enter the domain through yhi. This scenario can manifest as a simultion with a growing CFL error."
I have tried previously also saving the precursor files in yhi too, but right now I did not save in yhi. I am attaching some plots, can you confirm you were referencing to this behavior of flow at (x output).
I am attaching the input files too.
No_turbine_unstable.txt
precursor_unstable.txt
spinup_unstable.txt
Turbine_unstable.txt

Spinup:

Precursor:

Turbine:

No turbine:

P.S, I have asked at lawrence's github issue board too, since you mention this issue in your tutorial I really wanted to get help from you also. Thank you
Asim

[AsimUdel]

Hello @rybchuk ,
Could you please explain a bit about the settings of "mass_inflow" and what is its relevance with T(temperature), U (velocity) and P (pressure) ? and also below are the settings for my precursor and turbine run respectively,

Precursor:
"
geometry.is_periodic = 1 1 0
#xlo.type = mass_inflow
#xlo.density = 1.225
#xlo.temperature = 290.0
#xlo.tke = 0.0
#xhi.type = pressure_outflow

#ylo.type = mass_inflow
#ylo.density = 1.225
#ylo.temperature = 290.0
#ylo.tke = 0.0
#yhi.type = pressure_outflow
zlo.type = wall_model
zhi.type = slip_wall
zhi.temperature_type = fixed_gradient
zlo.temperature_type = zero_gradient
zhi.temperature = 0.003 "

Turbine:
"
geometry.is_periodic = 0 0 0
xlo.type = mass_inflow
xlo.density = 1.225
xhi.type = pressure_outflow
xlo.temperature_type = fixed_gradient
xlo.temperature = 0.0
xlo.tke = 0
xlo.pressure_type = buoyant_pressure
ylo.type = mass_inflow
ylo.density = 1.225
yhi.type = pressure_outflow
yhi.temperature_type = fixed_gradient
yhi.temperature = 0.0
ylo.temperature_type = fixed_gradient
ylo.temperature = 0.0
ylo.tke = 0
zlo.type = wall_model
zhi.type = slip_wall
zhi.temperature_type = fixed_gradient
zlo.temperature_type = zero_gradient
zhi.temperature = 0.003"

What option should I use if I want to use the boundary values of U, T, and TKE saved from the precursor run? are these settings best possible I could set? Thank you
Best
Asim