Hi. I am trying simulate a proces include energy and radiation, for ventilation in greenhouse, using turbulence model ske and 2D, but at moment to starting the proces, show a error message "divergence detected in AMG solver: temperature"

What's up?

Try going to solve > solutions and deselecting temperature and then try running it to see if it will work.

If it works for a while, you can try reenabling temperature and see if it crashes or not.

many thank's, I going to try, another time

Hello Paul. the problem persist. when the proces is only for fluxes, no problem for converge, but if activate energy, and consequently, boussinesq and gravity, I have a problem for "turbulent viscocity limite to viscocity ratio is >" however converge. Them, if activate radiation model, message "Error: divergence detected in AMG solver: temperature. Error Object: ()" is my great problem.

Thank's a lot

This is a manifestation of inability to solve the discrete algebraic equations. There are many controls that affect this. The most evident is the relaxation factors. Others can be the discretization scheme and many others, like gradient discretization, coupling etc. Another issue may be the well-posedness of the problem, which should be the first thing to re-check.

I belive you have reason, becouse, if I change the turbulence model, from standar to RNG, the proces is other, either, when the values of the factor relaxetion are modified

how long is the effect of the density, in relation with the temperature, when the gravity is enable, in convection natural conditions?

many thanks and, I will cotinue