# Moving text associated with \underbrace downward

Is there a way to move the text associated with an \underbrace{} downward? I've attempted to depict what I mean in the marked-up image below. The text "Thermal Conduction" does not need to be contained with in the left and right parentheses, nor the square braces. The goal is to reduce the overall height of the actual equation by moving the text outside the parentheses.

In case it is helpful, here is the raw latex used to generate the heat transport equation in porous media (shown below):

\begin{equation*}
\underbrace{\left( 1+ \frac{1- \phi}{\theta} \frac{C_{P_{s}}}{C_{P_{w}}} \frac{\rho_s}{\rho_w} \right) \frac{\partial \left( \theta T \right) }{\partial t}}_\text{change in stored energy}=\frac{\partial }{\partial x_i} \left[ \theta \left( \underbrace{\frac {k_{T_{bulk}}}{\theta C_{P_{w}} \rho_w}}_{\text{Thermal} \atop \text{Conduction}} + \alpha \frac{\mathrm{q}}{\theta} \right) \cdot \frac{\partial T}{\partial x_j} \right] - \frac{\partial }{\partial x_i} \left( \theta v_i T \right) + q'_s T_s + \frac{\theta \gamma_w }{C_{p_{w}}} + \frac{ \left( 1 - \phi \right) \gamma_s }{C_{p_{w}}} \frac{\rho_s}{\rho_w}
\end{equation*}

• Unfortunately this question off topic because it is about Word not LaTeX. Even though the Word equation editor supports a LaTeX like syntax it is not actually LaTeX. Commented Aug 26, 2021 at 19:17
• What about replacing \left( \right) by \Bigl( \Bigr)? Commented Aug 26, 2021 at 19:17
• @AlanMunn But doesn't the question extend to pure latex, how would one move the underbrace and the text downward and outside of the parentheses? Commented Aug 26, 2021 at 19:23
• @user2256085 No, because the underlying mechanism is completely different, even if some subset of the syntax is superficially in common. And since almost nobody here actually uses Word (or if they do, not for math) any answer you get will only work by accident. Commented Aug 26, 2021 at 19:29
• @user2256085: So can you supply your own LaTeX and it will render accordingly? For example, if you can edit the raw LaTeX, what happens when you add (say) \relax before the \underbrace?
– Werner
Commented Aug 26, 2021 at 19:34

If you're able to update the raw LaTeX code provided, you can manually choose the appropriate delimiter height with \biggl...\biggr pairs:

\documentclass{article}

\usepackage{amsmath}

\begin{document}

\noindent Original equation:
\begin{equation*}
\underbrace{
\left(
1 + \frac{1 - \phi}{\theta} \frac{C_{P_s}}{C_{P_w}} \frac{\rho_s}{\rho_w}
\right)
\frac{\partial \left( \theta T \right)}{\partial t}}_\text{change in stored energy}
=
\frac{\partial}{\partial x_i}
\left[
\theta
\left(
\underbrace{
\frac{k_{T_{bulk}}}{\theta C_{P_w} \rho_w}
}_{\text{Thermal} \atop \text{Conduction}}
+
\alpha \frac{\mathrm{q}}{\theta}
\right) \cdot \frac{\partial T}{\partial x_j}
\right]
-
\frac{\partial}{\partial x_i}
\left(
\theta v_i T
\right)
+ q'_s T_s + \frac{\theta \gamma_w}{C_{P_w}} + \frac{\left( 1 - \phi \right) \gamma_s}{C_{P_w}} \frac{\rho_s}{\rho_w}
\end{equation*}

\noindent Modified equation:
\begin{equation*}
\underbrace{
\biggl(
1 + \frac{1 - \phi}{\theta} \frac{C_{P_s}}{C_{P_w}} \frac{\rho_s}{\rho_w}
\biggr)
\frac{\partial ( \theta T )}{\partial t}}_\text{change in stored energy}
=
\frac{\partial}{\partial x_i}
\biggl[
\theta
\biggl(
\underbrace{
\frac{k_{T_\text{bulk}}}{\theta C_{P_w} \rho_w}
}_{\substack{\text{thermal} \\ \text{conduction}}}
+
\alpha \frac{\mathrm{q}}{\theta}
\biggr) \cdot \frac{\partial T}{\partial x_j}
\biggr]
-
\frac{\partial}{\partial x_i} (\theta v_i T)
+ q'_s T_s + \frac{\theta \gamma_w}{C_{P_w}} + \frac{(1 - \phi) \gamma_s}{C_{P_w}} \frac{\rho_s}{\rho_w}
\end{equation*}

\end{document}

Other minor changes include:

• Removal of unnecessary \left...\right combinations
• \text{bulk}
• \substack{\text{thermal} \\ \text{conduction}}
• Consistent use of P_w
• +1 surely. :-) I think that the image of the user is done (or is taken somewhere) with Cambria Math (peraphs) using Word-Office. Commented Aug 26, 2021 at 21:54