OpenLB – Open Source Lattice Boltzmann Code › Forums › on OpenLB › General Topics › PROBLEM uMax › Re: PROBLEM uMax April 24, 2017 at 5:39 pm #2610 mathiasKeymaster That basically means that the simulation tuned close to unstable. In such cases the results are not really reliable. THerefore we add this code to stop the simulation. Best Mathias