BUBBLE_EnforceAveragePressure

fix average pressure for all bubbles (UCV)

BUBBLE_EnforceAveragePressure = 1.0e5 # atmospheric pressure
In a closed computational domain with fixed amount of gas and air (for example tank half full with liquid), it makes sense to fix the average pressure of the bubbles as a whole. I.e., for all times, we require
\begin{align} \sum_{i}^{N_{\text{bubbles}}} p_{\text{bubble},tot}^{i}(t) V^i(t) = p_{\text{average}} V_{\text{total}}(t) \end{align}
If a positive number is given, all bubbles' pressure values are corrected by a constant value such that the average pressure constraint is satisfied.
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BUBBLE_EnforceAveragePressure fix average pressure for all bubbles (CV)
BUBBLE_EnforceAveragePressure fix average pressure for all bubbles (UCVO)
BUBBLE_EnforceAveragePressure fix average pressure for all bubbles (UCV)