I'm a student with no much experience with FEA and COMSOL. I'm trying to model the heat transfer from a heated cylinder. The cylinder has diameter of about 0.18 m and height of 0.36 m. The cylinder is hollow with holes from one side to the other side. I'm interesting in finding the temperature of the cylinder on steady state. my questions are: 1. How much elements the mesh should have? I just want to know the average temperature of the cylinder, I'm not interesting in some boundary effects or some thing like this. The mesh I have now has 170,000 elements. Is it enough for this kind of problem? When I try to model something, how do I know what is a reasonable size for the mesh? 2.Does the size of the mesh effects the accuracy of the whole solution? If a problem solved once with fine mesh and once with coarse mesh, would the average temperature of the whole object will be different?