OpenLB – Open Source Lattice Boltzmann Code › Forums › on OpenLB › General Topics › [SuperVTMwriter3D] Error: could not open file › Reply To: [SuperVTMwriter3D] Error: could not open file October 8, 2021 at 1:21 pm #6056 AdrianKeymaster Does the output of the default VTK files as implemented in the poiseuille3d example work on your system?