T(t, \mathbf{r}) = T(\mathbf{r})
Reservoir fluid temperature is not changing over time
s_w(t, \mathbf{r}) = s_w(\mathbf{r}), \quad s_o(t, \mathbf{r}) = s_o(\mathbf{r}), \quad s_g(t, \mathbf{r}) = s_g(\mathbf{r})
Reservoir saturation is not chaging over time
| \nabla B_o | \sim 0, \quad |\nabla B_g | \sim 0
No high fluid pressure gradients over reservoir volume
|\nabla P_{cow}(s)| \sim 0, \quad | \nabla P_{cog}(s)| \sim 0
No high capillary pressure gradients over reservoir volume
Multi-phase pressure diffusion @model
Volatile/Black Oil dynamic flow models @model
Non-linear multi-phase diffusion derivation @model