Due to recent bot attacks, newly registered users are required to send a message via our contact form in order to be able to post in the forum. OpenLB – Open Source Lattice Boltzmann Code › Forums › on OpenLB › General Topics › gpu usage question › Reply To: gpu usage question March 9, 2023 at 9:27 am #7294 H.YuParticipant It has been confirmed that an error occurs when using ‘using namespace olb::util’