fix: sampling requirement for inner scale

src/sampling_requirements.jl

@@ -116,7 +116,7 @@ function check_ps_sampling(domain::Domain, channel::TurbulentChannel; λ=1.55e-6
 end
 
 function check_ps_sampling(Nz, dx, dz, Cn², l0; λ=1.55e-6, silent=false)
-    req5 = dx ≤ l0
+    req5 = 2dx ≤ l0
     if !req5 && !silent
         @warn "Resolution dx=$dx insufficient for sampling of inner scale l0=$l0."
     end