Switched tabular_legendre to have a default of true

docs/source/usersguide/mgxs_library.rst

@@ -171,9 +171,7 @@ attributes/sub-elements required to describe the meta-data:
     provided via the ``scatt_type`` element above, is represented and thus used
     during the scattering process.  Specifically, the options are to either
     convert the Legendre expansion to a tabular representation or leave it as
-    a set of Legendre coefficients.  Converting to a tabular representation will
-    cost memory but can allow for a decrease in runtime compared to leaving as a
-    set of Legendre coefficients.  This element has the following
+    a set of Legendre coefficients.  Converting to a tabular representation will cost memory but can allow for a decrease in runtime compared to leaving as a set of Legendre coefficients.  This element has the following
     attributes/sub-elements:
 
     :enable:
@@ -181,7 +179,7 @@ attributes/sub-elements required to describe the meta-data:
       tabular format should be performed or not.  A value of "true" means
       the conversion should be performed, "false" means it should not.
 
-      *Default*: "false"
+      *Default*: "true"
 
     :num_points:
       If the conversion is to take place the number of tabular points is

openmc/mgxs/library.py

@@ -784,8 +784,7 @@ class Library(object):
             representation by OpenMC.  A value of `True` means that it is to be
             converted while a value of 'False' means that it will not be.
             Defaults to `None` which leaves the default behavior of OpenMC in
-            place (the distribution is not converted to a tabular
-            representation).
+            place (the distribution is converted to a tabular representation).
         tabular_points : {int}
             This parameter is not used unless the `tabular_legendre` is set to
             `True`.  In this case, this parameter sets the number of
@@ -954,8 +953,7 @@ class Library(object):
             representation by OpenMC.  A value of `True` means that it is to be
             converted while a value of 'False' means that it will not be.
             Defaults to `None` which leaves the default behavior of OpenMC in
-            place (the distribution is not converted to a tabular
-            representation).
+            place (the distribution is converted to a tabular representation).
         tabular_points : {int}
             This parameter is not used unless the `tabular_legendre` is set to
             `True`.  In this case, this parameter sets the number of
@@ -1054,8 +1052,7 @@ class Library(object):
             representation by OpenMC.  A value of `True` means that it is to be
             converted while a value of 'False' means that it will not be.
             Defaults to `None` which leaves the default behavior of OpenMC in
-            place (the distribution is not converted to a tabular
-            representation).
+            place (the distribution is converted to a tabular representation).
         tabular_points : {int}
             This parameter is not used unless the `tabular_legendre` is set to
             `True`.  In this case, this parameter sets the number of

src/mgxs_header.F90

@@ -387,11 +387,13 @@ module mgxs_header
 
       ! Get scattering treatment information
       ! Tabular_legendre tells us if we are to treat the provided
-      ! Legendre polynomials as tabular data (if enable is true) or leaving
-      ! them as Legendres (if enable is false, or the default)
+      ! Legendre polynomials as tabular data (if enable is true, default)
+      ! or leaving them as Legendres (if enable is false)
 
-      ! Set the default (leave as Legendre polynomials)
-      enable_leg_mu = .false.
+      ! Set the default (Convert to tabular format w/ 33 points)
+      enable_leg_mu = .true.
+      legendre_mu_points = 33
+      ! Get the user-provided values
       if (check_for_node(node_xsdata, "tabular_legendre")) then
         call get_node_ptr(node_xsdata, "tabular_legendre", node_legendre_mu)
         if (check_for_node(node_legendre_mu, "enable")) then

tests/test_mg_basic/results_true.dat

@@ -1,2 +1,2 @@
 k-combined:
-1.033731E+00 4.974463E-02
+1.003952E+00 4.160185E-02

tests/test_mg_max_order/results_true.dat

@@ -1,2 +1,2 @@
 k-combined:
-1.055274E+00 1.715904E-02
+1.026398E+00 7.824554E-02

tests/test_mg_nuclide/results_true.dat

@@ -1,2 +1,2 @@
 k-combined:
-1.033731E+00 4.974463E-02
+1.003952E+00 4.160185E-02

tests/test_mgxs_library_ce_to_mg/results_true.dat

@@ -1,2 +1,2 @@
 k-combined:
-1.094839E+00 1.203524E-02
+1.151644E+00 3.044607E-02