Reynolds number relation with number of particles
When I looked at the 5th user workshop slides I found that there's a factor of 62.5 between actual and SPH Reynolds number and we had to adjust the number of particles to get the actual Reynolds number. I‘m a little confused how the particles numbers would be related to Reynolds number here.
Let's say we have a 2D lid-driven cavity flow problem. The dimensions of fluid are 1 m by 1 m and lid velocity is 1 m/s. hdp=2; dp =0.01; speed of sound = 10; artificial viscosity = 0.04; The Reynolds number here is 1000 right? Or do I need to change particle numbers to get the actual Re? Can anyone clarify this for me? Thanks.