I 'm using the latest nektar++ version. However when running the TurbChFl_3DH1D.xml example and using FieldConvert calculating vorticity or Qcriterion,  I got errors as "ERROR: Element u_33 is 0 from dgetrf". I have checked the velocity and pressure field, it is correct, so if there is some inconsistency in FieldConvert for 1D homogeneous problem?