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-rw-r--r--source/know/concept/material-derivative/index.md20
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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