please show me how to mesh my cylindrical geometry have 6 wall and different meshing type and how to join this cylinder with tow another cylinder to be as one volume with my regards sihat

you have mentioned cylindrical and also 6 walls, how ? how does a cylindrical with 6 walls look like ?.kindly explain your geometry. As far as your question for connecting two cyl into one,this can be done using unite command in gambit , with out retaining the goemetry

i hope this helps ciao

i mean i using 3-electrode ticked in the surface wall of the cylinder along its length sihat