[yetlyg]

Hello All,

My project involves the natural convection study of a long vertical tube.

My geometry is a 2D (30mm x 1m) rectangle. One side of the 1 m length will be the line of symmetry (axisymmetric) and the other 1m side will be the tube wall (3mm thickness). Please see attached snapshot.

My goal is to create a good quality mesh. I keep getting messages of poor quality.

I want to have a bias factor on all four sides of the rectangle. But because there is a wall thickness, I will need to put a bias factor in all sides of the wall thickness geometry as well. Please see attached snapshots.

This method is not working. I am trying to improve the aspect ratio by adding more elements or divisions on my edge sizing and changing the bias factors as well. I used bias factors ranging from 5-50.

Can anyone please give some advice? Is it just a matter of finding the right number of divisions on each edge in order to make this good quality?

Thank you and have a good day.

Yetly