Minor Fix on Doc and examples

Author: haochey

docs/documentation/case.md

@@ -333,9 +333,9 @@ Note that `time_stepper` $=$ 3 specifies the total variation diminishing (TVD),
 - `wave_speeds` specifies the choice of the method to compute the left, right, and middle wave speeds in the Riemann solver by an integer of 1 and 2.
 `wave_speeds` $=$ 1 and 2 correspond to the direct method ([Batten et al., 1997](references.md#Batten97)), and indirect method that approximates the pressures and velocity ([Toro, 2013](references.md#Toro13)), respectively.
 
-- `weno_Re_flux` activates the scaler divergence theorem in computing the velocity gradients using WENO-reconstructed cell boundary values.
+- `weno_Re_flux` activates the scaler divergence theorem in computing the velocity gradients using WENO-reconstructed cell boundary values. If this option is false, velocity gradient is computed using finite difference scheme of order 2 which is independent of the WENO order.
 
-- `weno_avg` activates the arithmetic average of the left and right, WENO-reconstructed, cell-boundary values.
+- `weno_avg` it activates the arithmetic average of the left and right, WENO-reconstructed, cell-boundary values. This option requires `weno_Re_flux` to be true because cell boundary values are only utilized when employing the scalar divergence method in the computation of velocity gradients.
 
 
 ### 6. Formatted Output

examples/3D_turb_mixing/case.py

@@ -42,9 +42,6 @@
 Nt      = t_save*Nfiles
 t_step_start    = Ntstart
 t_step_stop     = int(Nt)
-
-# Derive dynamic viscosity (rho =1)
-Mu = u0*Lx/Re0
 # ==============================================================================
 
 
@@ -131,7 +128,7 @@
     # Surrounding liquid
     'fluid_pp(1)%gamma'             : 1./(gamma-1.),
     'fluid_pp(1)%pi_inf'            : 0.,
-    'fluid_pp(1)%Re(1)'             : 1/Mu,
+    'fluid_pp(1)%Re(1)'             : Re0,
     # =========================================================================
 }))