fix spherical blast wave test with proper threshold and vtk output periodicity

Author: Geoffroy Lesur

test/HD/SedovBlastWave/idefix-spherical.ini

@@ -1,6 +1,6 @@
 [Grid]
-X1-grid    1  0.5  32   u  1.5
-X2-grid    1  0.0  32   u  1.0
+X1-grid    1  0.5  64   u  1.5
+X2-grid    1  0.0  64   u  1.0
 X3-grid    1  0.0  256  u  6.283185307179586
 
 [TimeIntegrator]
@@ -25,4 +25,4 @@ X3-beg    periodic
 X3-end    periodic
 
 [Output]
-vtk    0.01
+vtk    0.1

test/HD/SedovBlastWave/python/testidefix.py

@@ -70,7 +70,10 @@
 
 error=np.mean(np.fabs(p3D[index]-solinterp(r3D[index])))
 print("Error=%e"%error)
-if error<7.7e-2:
+erroref = 7.7e-2
+if V.geometry == "spherical":
+    erroref = 1.9e-1
+if error<erroref:
     print("SUCCESS!")
     sys.exit(0)
 else: