OpenLB – Open Source Lattice Boltzmann Code › Forums › on OpenLB › Bug Reports › instability problem › Re: instability problem February 14, 2012 at 7:18 pm #2037 mathiasKeymaster Hi Jepson,rnrn A more natural way is to fix the Reynolds number and slowly increase the inflow velocity as done in “”example/cylinder3d”” in the function “”reIniGeometry””.rnrnMathias