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LaTeX Math Block
anchorXSQUE
alignmentleft
\phi \cdot \partial_\tau \Psifrac{\partial \Psi}{\partial \tau}

 -   
 \nabla \cdot \left( k \cdot   \vec \nabla \Psi   \right) 
  = 0
LaTeX Math Block
anchorXSQUE
alignmentleft
-\frac{k}{\mu} \, \int_{\Sigma} \, \nabla p \, d {\bf \Sigma} = q(t)

...

LaTeX Math Block
anchorRLS49
alignmentleft
\phi \, c_t \, \mu \cdot \frac{\partial_t \Psi}{\partial \tau} -   
 \nabla \cdot \left( k \cdot   \vec \nabla \Psi   \right) 
  = 0

...

In case of the ideal gas equation of state, the  Z-factor has a unit value:

LaTeX Math Inline
bodyZ(p) = 1
, viscosity does not depend on pressure 
LaTeX Math Inline
body\mu(p) = \mu
 and total compressibility is fully defined by fluid compressibility 
LaTeX Math Inline
body--uriencoded--\displaystyle c_t = c_r + c \sim \frac%7B1%7D%7Bp%7D
 which simplifies the expression for Pseudo-Pressure and Pseudo-Time as to:

LaTeX Math Block
anchorCAEN8
alignmentleft
\Psi(p) = \frac{p^2}{\mu}
LaTeX Math Block
anchor8ORPU
alignmentleft
\tau(t) = \frac{1}{\mu} \int_0^t p_{BHP}(t) dt


See also

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Physics / Mechanics / Continuum mechanics / Fluid Mechanics / Fluid Dynamics / Pressure Diffusion / Pressure Diffusion @model

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