Improve knowledge base

1 files changed, 0 insertions, 20 deletions

diff --git a/source/know/concept/material-derivative/index.md b/source/know/concept/material-derivative/index.md
index 7225053..d11287d 100644
--- a/source/know/concept/material-derivative/index.md
+++ b/source/know/concept/material-derivative/index.md
@@ -88,26 +88,6 @@ $$\begin{aligned}
     }
 \end{aligned}$$
 
-Where the advective term is to be evaluated in the following way in Cartesian coordinates:
-
-$$\begin{aligned}
-    (\va{v} \cdot \nabla) \va{U}
-    =
-    \begin{bmatrix} v_x \\ v_y \\ v_z \end{bmatrix}
-    \cdot
-    \begin{bmatrix}
-        \displaystyle\pdv{U_x}{x} & \displaystyle\pdv{U_x}{y} & \displaystyle\pdv{U_x}{z} \\
-        \displaystyle\pdv{U_y}{x} & \displaystyle\pdv{U_y}{y} & \displaystyle\pdv{U_y}{z} \\
-        \displaystyle\pdv{U_z}{x} & \displaystyle\pdv{U_z}{y} & \displaystyle\pdv{U_z}{z}
-    \end{bmatrix}
-    =
-    \begin{bmatrix}
-        v_x \displaystyle\pdv{U_x}{x} & v_y \displaystyle\pdv{U_x}{y} & v_z \displaystyle\pdv{U_x}{z} \\
-        v_x \displaystyle\pdv{U_y}{x} & v_y \displaystyle\pdv{U_y}{y} & v_z \displaystyle\pdv{U_y}{z} \\
-        v_x \displaystyle\pdv{U_z}{x} & v_y \displaystyle\pdv{U_z}{y} & v_z \displaystyle\pdv{U_z}{z}
-    \end{bmatrix}
-\end{aligned}$$
-
 
 
 ## References