OpenLB – Open Source Lattice Boltzmann Code › Forums › on OpenLB › General Topics › Aerodynamic Lens › Re: Aerodynamic Lens July 17, 2017 at 1:55 pm #2667 MaminMember Sorry the figure just missed up. they are just 4 cylinders connected to each other with different radii. r1-r2-r3-r4 where r1=r3 and they are greater than r2 and r4. Thanks