I try to understand how to properly carry out LBM simulations with OpenLB.
I follow examples provided in the package: in ventury3D one has CharPhysVelocity=2m/s in the xml file. But in Paraview I see that the max of the imposed (physical) velocity is 0.2m/s. I would greatly appreciate some hints to help me to understand why there is this factor of 10.
Thank you for your attention.
The common approach is to set the characteristic physical velocity to the maximum velocity that is expected to occur during the simulation. For the venturi case this is higher than the imposed inlet velocity of 0.2 m/s.
While 2 m/s is still too large by that measure in the example case this may either be some remnant from earlier versions or there may be a engineering model reason for setting it to this specific value.