updated README for Fig. 6; change parameters in plot_dispersion.py

Author: Daniel Ruprecht

README.md

@@ -25,7 +25,7 @@ How can I reproduce Figures from the publication?
  - Fig. 3 --> scripts/plot_dispersion.py with parameter nu=0.0 and nu=0.1
  - Fig. 4 --> example/run.py
  - Fig. 5 --> scripts/plot_ieuler_dispersion.py
- - Fig. 4 --> scripts/plot_dispersion.py with approx_symbol=True
+ - Fig. 6 --> scripts/plot_dispersion.py with stencil=2 (also set nu=0.0 and dx=1.0)
  - Fig. 5 --> scripts/plot_dispersion.py with artificial_coarse=1 or 2
  - Fig. 6 --> example/run.py with artificial_coarse=2
  - Fig. 7 --> scripts/plot_svd_vs_waveno_different_G.py

scripts/plot_dispersion.py

@@ -59,7 +59,7 @@ def normalise(R, T, target):
     U_speed  = 1.0
 
     # diffusivity parameter
-    nu       = 0.1
+    nu       = 0.0
 
     # select coarse integrator:
     # 0 = normal backward Euler method
@@ -74,7 +74,7 @@ def normalise(R, T, target):
     # stencil = 0 : exact symbol, no approximation of spatial derivative
     # stencil = 1 : first order upwind  (only fur nu=0)
     # stencil = 2 : second order centred (only for nu=0)
-    stencil = 0
+    stencil = 2
 
     ncoarse  = 1
     nfine    = 10