EOS2

Table 20. Primary Variables and alternative initial conditions for EOS2

Phase Conditions	PrV1	PrV2	PrV3	PrV4	PrV5	PrV6
Gas	Pg	Pco2	Xtr1	Xtr2	Xtr3	T
Aqueous	Pa	Pco2	Xtr1	Xtr2	Xtr3	T
Two-Phase	Pg	Sg+10	Xtr1	Xtr2	Xtr3	Pco2
Gas (Alternative)	Pg	Xco2	Xtr1	Xtr2	Xtr3	T
Aqueous (Alternative	Pa	Xco2	Xtr1	Xtr2	Xtr3	T
Two-phase (Alternative)	Pg	Sg+10	Xtr1	Xtr2	Xtr3	T

Table 20 shows the parameters of default or alternative initial conditions for EOS2. In the table, Xtrn is tracer n mass fraction in the user specified phase. Xco2 is CO2 mass fraction in existing phase. Pg and Pa are pressure for gas and aqueous phase respectively. T is temperature. Pco2 is CO2 partial pressure. Xtr1-Xtr3 are optional. They are required only when the corresponding tracer component exists in the model.

User can use alternative set parameters as the initial conditions through defining initCType in input data record MODDE.1 or command line –i <parameter>

initCType =

“EOS2” reading the TOUGH3/EOS2 input files.

“SPEOS2” using an alternative set parameter as initial conditions (the last 3 lines, Table 20).