Pressure diffusion with constant coefficients:
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\beta \, \frac{\partial p}{\partial t} = \nabla ( \alpha \nabla p) + q({\bf r}) |
where
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\frac{\partial \alpha({\bf r})}{\partial p} = 0 |
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\frac{\partial \beta({\bf r})}{\partial p} = 0 |
It honours linear PDE