radiation and natural convection - gravity

carlos

Hello Have you ever made fluent's radiation and natural convection tutorial? there is one thing that is not clear to me. How they calculate the gravity for the bousinesque density model. The tutorial mentions that it is adjusted to yield Prandtl, Rayleigh and Planck numbers. That is very good, however they don't say anything how they actually adjust this number. I want to do the same thing but with a different model with different dimensions and different operational conditions all those numbers mentioned above are different from those in the tutorial, now I don't know how to relate these to the gravity acceleration value. Have you got any idea of this relationship? Kind regards