always negative jacobian (non-constant elements)
Dear all. I need your help. These days I want to use GMSH to obtain mesh file. But it always has these problems:1) Warning: Could not orient normal of surface XX (XX is surface number);2) Warning: YY elements are completely inverted. (YY is elements numbers);3) minJ/maxJ = 0.893 (avg on the 2480 non-constant elements); 4) the structured mesh are used and it look good, but the minJ is always negative. If there is element with negative Jacobi, how can i find the position of these elements. Actually, I have work for theses problems several days, but i am failed. The .geo file is presented in the attachment. model.geo