Merge pull request #222 from haochey/master

Author: sbryngelson

docs/documentation/case.md

@@ -574,6 +574,7 @@ The entries labeled "Characteristic." are characteristic boundary conditions bas
 | 17   | Spiral             | 2     | N      | Requires `[x,y]_centroid` |
 | 18   | 2D Varcircle       | 2     | Y      | Requires `[x,y]_centroid`, `radius`, and `thickness` |
 | 19   | 3D Varcircle       | 3     | Y      | Requires `[x,y,z]_centroid`, `length_z`, `radius`, and `thickness` |
+| 20   | 2D Taylor-Green Vortex  | 2  | N     | Requires `[x,y]_centroid`, `length_x`, `length_y`, `vel(1)`, and `vel(2)` |
 | 21   | Model              | 2 & 3 | Y      | Imports a Model (STL/OBJ). Requires `model%filepath`. |
 
 The patch types supported by the MFC are listed in table [Patch Types](#patch-types). This includes