Bård Skaflestad 1a182d4a48 Add basic equilibration facility ... This commit adds a simple facility for calculating initial phase pressures assuming stationary conditions, a known reference pressure in the oil zone as well as the depth and capillary pressures at the water-oil and gas-oil contacts. Function 'Opm::equil::phasePressures()' uses a simple ODE/IVP-based approach, solved using the traditional RK4 method with constant step sizes, to derive the required pressure values. Specifically, we solve the ODE dp/dz = rho(z,p) * g with 'z' represening depth, 'p' being a phase pressure and 'rho' the associate phase density. Finally, 'g' is the acceleration of gravity. We assume that we can calculate phase densities, e.g., from table look-up. This assumption holds in the case of an ECLIPSE input deck. Using RK4 with constant step sizes is a limitation of this implementation. This, basically, assumes that the phase densities varies only smoothly with depth and pressure (at reservoir conditions).		2018-01-02 14:28:06 +01:00
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simulator	Add basic equilibration facility	2018-01-02 14:28:06 +01:00