[camille131]

Good evening,

I am a new CFD user, I have to simulate a burner with reactingFoam but I'm not sure of the fineness of my mesh.

The chamber is a cylinder 50 cm long and has a diameter of 20 cm
Since it is a axisymmetric problem, I try to simulate only a wedge of the cylinder of 5° and one cell thick.

I suppose the mesh is finner at the inlet and near the wall , and is coarser at the outlet.

but how many cells do I have to set? or either what is the necessary size of the smallest cell ?

- First if I use the RANS calculation ?
Is there a thumb rule like with LES simulation? h<30 n where h is the grid size and n is the kolmogorov length scale

Thank you in advance for you answer

Cam