NINEPOIN

Recognised by the OPM Flow parserRUNSPEC

The NINEPOIN keyword activates the Nine-Point Discretization formulation for the whole grid. If the keyword is absent from the run then the conventional standard five-point discretization formulation is used for the model. The nine-point scheme is based on adding additional non-neighbor connections between the diagonal neighbors in the areal plane, in order to reduce grid orientation effects92 Yanosik, J. L. and McCracken, T. A. “A Nine-Point, Finite-Difference Reservoir Simulator for Realistic Prediction of Adverse Mobility Ratio Displacements,” paper SPE 5734, Society of Petroleum Engineers Journal (1979) 19, No. 4, 253-262..

Yanosik, J. L. and McCracken, T. A. “A Nine-Point, Finite-Difference Reservoir Simulator for Realistic Prediction of Adverse Mobility Ratio Displacements,” paper SPE 5734, Society of Petroleum Engineers Journal (1979) 19, No. 4, 253-262.

This keyword is not supported by OPM Flow but would change the results if supported so the simulation will be stopped.

In none Local Grid Refinement runs the NINENUM keyword in the GRID section may be use to optionally set parts of the grid to use nine-point discretization and the remaining regions to use the conventional standard five-point discretization formulation.

There is no data required for this keyword and there is no terminating “/” for this keyword.

Records

No records — the keyword stands alone

Example

--
-- ACTIVATE THE NINE-POINT DISCRETIZATION OPTION
--
NINEPOIN
The above example switches on the Nine-Point Discretization option for the whole grid.

Manual source: parts/chapters/subsections/5.3/NINEPOIN.fodt