OpenLB – Open Source Lattice Boltzmann Code › Forums › on OpenLB › General Topics › Change material number › Re: Change material number August 15, 2015 at 8:57 am #2221 mathiasKeymaster Hi,rnrnIn the periodic case, the corner nodes needs to be of the inflow and outflow type. Otherwise the domain is not closed and you will get bad results. rnrnBestrnMathias