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 8:40 pm #6058 achodankarParticipant Yes the standard example Poiseuille3d works. What can be the possible cause for the error? I have changed the dimensions of cylinder.