Too fine mesh
 

Hi,
This is my first attempt to post a thread here. I am now trying to generate good mesh of bio materials, such as tube. There is 2D mesh on 3D surfaces. I cut a geometry and triangulated around the cut surface in a few times. Then there are too fine mesh around the cutting, and I have to correct it before next step. I want to some how generate rougher mesh from current mesh file(.stl), I mean I want to generate a good new mesh which has similar shape as the current geometry. I tried in some ways, but only result in generating finer mesh. Please teach me if you know the good way to rough mesh.

Thank you,
shh