When i try to compute a stationary problem of a 3d model,singular matrix occurs,like: - Feature: Stationary Solver 1 (sol2/s1) Failed to find a solution. Singular matrix.
For mesh-case 0 there are 29578 void equations (empty rows in matrix) for the variable comp1.V. at coordinates: (-0.04,-0.04,-0.04), (-0.04,-0.032,-0.04), (-0.04,-0.036,-0.04), (-0.036,-0.04,-0.04), (-0.032,-0.04,-0.04), ... and similarly for the degrees of freedom (empty columns in matrix). Returned solution is not converged. Not all parameter steps returned. i find one of my material,air,has a 0 conductivity(default).then i change it to a tiny value,like 1,the singular matrix problem disappears.