Hi, rnrnFirst of all, this is an amazing project! Congratulations to all people that some how collaborated with it. rnrnI am a new user of the OpenLB and I just finished to run one example simulation (cylinder2d). From the books that I read, using the momentum exchange approach, we can calculate the drag coefficient using the following equation: cd = (2*Fx)/(rho*D*(u^2)). Where D = diameter of the cylinder, rho = density, u = LBM velocity. rnrnThe example simulation (Re=20) gave me Drag = 5.63043, but using the equation above I can not reach a reasonable drag coefficient for Re=20. Could somebody help me?rn rnBest,rnPedro Paulo.