Page 281 - Principles of Applied Reservoir Simulation 2E

266 Principles of Applied Reservoir Simulation

2,
KSOL Solution method code.
MITR Maximum number of LSOR iterations per timestep. A
typical value is 100.
OMEGA Initial LSOR acceleration parameter. Values of OMEGA
should be between 1.0 and 2.0. A typical initial value is 1.5.
TOL Maximum acceptable pressure change for convergence of
LSOR iterations (psia). A typical value is 0.1.
TOL1 Parameter for determining when to change OMEGA. A
typical value is 0,001. If TOL1 = 0.0, the initial value of
OMEGA will be used for the entire run.
DSMAX Maximum saturation change allowed per timestep (traction).
The timestep size will be reduced by FACT2 if the saturation
change of a phase in any gridblock exceeds DSMAX during
a timestep. A typical value for DSMAX is 0.05.
DPMAX Maximum pressure change allowed per timestep (psia). The
timestep size will be reduced by FACT2 if the pressure
change in any gridblock exceeds DPMAX during a timestep.
A typical value of DPMAX is 100 psia.
NUMDIS Code for controlling numerical dispersion

Code Value Meaning
1 ID Tridiagonal Algorithm. Use with ID problems
and OD (tank) problems, i.e. when II = JJ = KK = 1 .
2 Direct solution band algorithm. Use with 2D and
3D problems.
3 LSORX - Iterative matrix solver with direct solver in
1C SOT
x direction.
4 LSORY - Iterative matrix solver with direct solver in
y direction.
5 LSORZ - Iterative matrix solver with direct solver in
z direction.