Update calculate_structure_function_2d.py

Author: BrodiePearson

src/fluidsf/calculate_structure_function_2d.py

@@ -16,7 +16,7 @@ def calculate_structure_function_2d(  # noqa: D417, C901
     boundary="periodic-all",
 ):
     """
-    Calculate structure function, either advective or traditional.
+    Calculate structure functions, including advective structure functions.
     Supports velocity-based structure functions and scalar-based structure functions.
 
     Parameters
@@ -55,41 +55,53 @@ def calculate_structure_function_2d(  # noqa: D417, C901
             The returned dictionary may contain the following keys, with some keys
             removed if the structure function is not calculated:
 
-                **SF_advection_velocity_x**: The advection velocity structure function
+                **SF_advection_velocity_x**: The advective velocity structure function
                 in the x direction.
 
-                **SF_advection_velocity_y**: The advection velocity structure function
+                **SF_advection_velocity_y**: The advective velocity structure function
                 in the y direction.
 
-                **SF_advection_scalar_x**: The scalar structure function in the x
+                **SF_advection_scalar_x**: The advective scalar structure function in the x
                 direction.
 
-                **SF_advection_scalar_y**: The scalar structure function in the y
+                **SF_advection_scalar_y**: The advective scalar structure function in the y
                 direction.
 
-                **SF_LL_x**: The traditional structure function LL in the x direction.
+                **SF_LL_x**: The second-order longitudinal velocity structure function 
+                in the x direction.
 
-                **SF_LL_y**: The traditional structure function LL in the y direction.
+                **SF_LL_y**: The second-order longitudinal velocity structure function 
+                in the y direction.
 
-                **SF_TT_x**: The traditional structure function TT in the x direction.
+                **SF_TT_x**: The second-order transverse velocity structure function 
+                in the x direction.
 
-                **SF_TT_y**: The traditional structure function TT in the y direction.
+                **SF_TT_y**: The second-order transverse velocity structure function 
+                in the y direction.
 
-                **SF_SS_x**: The traditional structure function SS in the x direction.
+                **SF_SS_x**: The second-order scalar structure function 
+                in the x direction.
 
-                **SF_SS_y**: The traditional structure function SS in the y direction.
+                **SF_SS_y**: The second-order scalar velocity structure function 
+                in the y direction.
 
-                **SF_LLL_x**: The traditional structure function LLL in the x direction.
+                **SF_LLL_x**: The third-order longitudinal velocity structure function 
+                in the x direction.
 
-                **SF_LLL_y**: The traditional structure function LLL in the y direction.
+                **SF_LLL_y**: The third-order longitudinal velocity structure function 
+                in the y direction.
 
-                **SF_LTT_x**: The traditional structure function LTT in the x direction.
+                **SF_LTT_x**: The third-order longitudinal velocity structure function 
+                in the x direction.
 
-                **SF_LTT_y**: The traditional structure function LTT in the y direction.
+                **SF_LTT_y**: The third-order longitudinal-transverse-transverse velocity 
+                structure function in the y direction.
 
-                **SF_LSS_x**: The traditional structure function LSS in the x direction.
+                **SF_LSS_x**: The third-order longitudinal-scalar-scalar structure function 
+                in the x direction.
 
-                **SF_LSS_y**: The traditional structure function LSS in the y direction.
+                **SF_LSS_y**: The third-order longitudinal-scalar-scalar structure function 
+                in the y direction.
     """
     inputs = {
         "u": u,