### Appendix 4. In-Form operands

The following paragraphs explain the meaning of the operands which may appear in In-Form formulae.

The operands are introduced in alpabetical order.

Clicking in the variable name will evoke the the relevant Encyclopaedia entry,

It should be noted that the name used by In-Form is not always the same as the name of the variable known to EARTH, and used in Ground coding. See, for example, DXG.

• AEAST is the east area of a cell.

• ANORTH is the north area of a cell.

• AHIGH is the high area of a cell.

• AZDZ is the variation of DZ with z distance.

• AZXU is the variation of XULAST with z distance.

• AZYV is the variation of YVLAST with z distance.

• AZPH is linear coefficient for the downstream impressed pressure level PBAR.

• BSOR is the nominal value of built-in source term in finite-volume equation calculated by PHOENICS EARTH. It can be used in formula of (MODSOR statement only.

• CFIPS determines the reference coefficient for inter-phase transport.

• CMDOT is interphase mass-transfer parameter.

• CONV is the nominal value of convection term in finite-volume equation calculated by PHOENICS EARTH. It can be used in formula of (MODCON statement only.

• CP1 is the specific heat of the phase-1 material.

• CP2 is the specific heat of the phase-2 material.

• DEN1 is the density of phase 1.

• DEN2 is the density of phase 2.

• DIFF is the nominal value of diffusion term in finite-volume equation calculated by PHOENICS EARTH. It can be used in formula of (MODDIF statement only.

• DRH1DP is the compressibility of the phase 1 fluid.

• DRH2DP is the compressibility of the phase 2 fluid.

• DT is the current time-step size.

• DVO1DT is the volumetric coefficient of thermal expansion of the phase-1 material.

• DVO2DT is the volumetric coefficient of thermal expansion of the phase-2 material.

• DXG is the distance in the IX-direction between centres of scalar-variable cells.

• DXU is the distance in the IX-direction between walls of scalar-variable cells.

• DYG is the distance in the IY-direction between centres of scalar-variable cells.

• DYV is the distance in the IY-direction between walls of scalar-variable cells.

• DZG is the distance in the IZ-direction between centres of scalar-variable cells.

• DZW is the distance in the IZ-direction between walls of scalar-variable cells.

• DZ is the current width of the slab, and the forward-step size in parabolic calculations.

• DZL is the z-thickness of the previous slab.

• DZGL is the distance between the cell centres of the low slab-cell and the current-slab cell.

• DZRAT is DZ / DZL.

• EL1 is the mixing length-scale of the first-phase fluid.

• EL2 is the mixing-length scale of the second-phase fluid.

• EMISS is the emission (and absorption) coefficient of a transparent medium.

• ENUL is the reference laminar kinematic viscosity.

• ENUT is the turbulent kinematic viscosity.

• FIXFLU is 2.0E-10, a coefficient recognized in the third argument of COVAL, to be used to indicate a fixed-flux condition.

• FIXP is 1.0, a coefficient name recognized in the third argument of COVAL, to be used when the external pressures are fixed.

• FIXVAL is 2.0E10, a coefficient name recognized in the third argument of COVAL, to be used to indicate a fixed-value condition.

• FSTEP is the first time step size.

• FSWEEP is the number of first sweep.

• GREAT is 1.0E20, a large number, used in EARTH.

• GRND is -10110.0, a special flag.

• GRND1 is -10120.0, a special flag.

• GRND2 is -10130.0, a special flag.

• GRND3 is -10140.0, a special flag.

• GRND4 is -10150.0, a special flag.

• GRND5 is -10160.0, a special flag.

• GRND6 is -10170.0, a special flag.

• GRND7 is -10180.0, a special flag.

• GRND8 is -10190.0, a special flag.

• GRND9 is -10200.0, a special flag.

• GRND10 is -10210.0, a special flag.

• INDVAR is the number of current dependent variable.

• IRUN is the current run number.

• IDRH1 is the compressibility of the phase 1 fluid.

• IDRH2 is the compressibility of the phase 2 fluid.

• IDVO1 is the volumetric coefficient of thermal expansion of the phase-1 material.

• IDVO2 is the volumetric coefficient of thermal expansion of the phase-2 material.

• ISPH1 is the specific heat of the phase-1 material.

• ISPH2 is the specific heat of the phase-2 material.

• ISTEP is the time-step number.

• ISWEEP is the current sweep number.

• ITHYD is the current iteration number at the current z-slab.

• IXF is the west extent of the current patch.

• IXL is the east extent of the current patch.

• IYF is the south of the current patch.

• IYL is the north of the current patch.

• IZ or IZSTEP is the grid-point location in the z-direction.

• LEN1 is the length scale of phase 1.

• LEN2 is the length scale of phase 2.

• LITHYD is the maximum number of hydrodynamic iteration.

• LSGLN is the length of a part of line sub-grid object which is located in a cell. The number of In-Form object should be specified in 'INFOB_' flag of In-form statement.

• LSGTL is the total length of line sub-grid object. The number of In-Form object should be specified in INFOB_ flag of In-Form statement.

• LSTEP is the maximum number of time steps a transient-flow simulation.

• LSWEEP is the maximum number of iterative sweeps.

• MASS1 is the mass of phase-1.

• MASS2 is the mass of phase-1.

• NRUN is the maximum number of runs (in a multi-run calculation).

• NX is the number of intervals in the x-direction.

• NY is the number of intervals in the y-direction.

• NZ is the number of intervals in the z-direction.

• OPPVAL is -10250.0, a special flag.

• PBAR is downstream mean pressure for use in parabolic calculations.

• RG is radius of the cell centre (for polar-coordinate grids).

• RHO1 is the density of the first phase.

• RHO2 is the density of the second phase.

• RINNER is the inner radius (for polar-coordinate grids).

• RV is radius of the v-velocity node (for polar-coordinate grids).

• SAME is -10260.0, special flag.

• SCATT is scattering coefficient of the transparent medium.

• SNALFA is grid-edge slope in parabolic grids.

• TEMP1 is the temperature of the first phase, when this is deduced from the enthalpy.

• TEMP2 is the temperature of the second phase, when this is deduced from the enthalpy.

• TFIRST is the starting time in the calculation of a time-dependent process.

• TIM is the current time size in seconds.

• TINY is a small real number, defaulted to 1.E-20.

• TLAST is the finishing time in the calculation of a time-dependent process.

• TMP1 is first-phase temperature, when the variable TEM1 is not being solved for directly.

• TMP2 is second-phase temperature, when the variable TEM2 is not being solved for directly.

• TSURR is the temperature of the surroundings.

• VISL is the laminar kinematic viscosity.

• VISTis the turbulent kinematic viscosity.

• VLFRIO is volume fraction of In-Form object. It is equal 1 if the cell is completely filled by object. The number of In-Form object should be specified in INFOB_ flag of In-Form statement.

• VOL is the volume of the cell.

• VOLU is the volume of the cell (for multi-domain calculation).

• XG is the x-coordinate of the centre point of a grid cell.

• XRAT is the multiplier of the previous XULAST which gives the current XULAST.

• XU is the distance in x direction from the origin of the corresponding velocity-storage points.

• XULAST is the overall size of the integration domain in the x-direction

• YG is the y-coordinate of the centre point of a grid cell.

• YRAT is the multiplier of the previous YVLAST which gives the current YVLAST.

• YV is the distance in y direction from the origin of the corresponding velocity-storage points.

• YVLAST is the overall size of the integration domain in the y-direction.

• ZG is the z-coordinate of the centre point of a grid cell.

• ZWLAST is the overall size of the integration domain in the z-direction.

• ZWADD is the addition which is made to z-coordinate values when these are used for grid-stretching.

• ZW is the distance in z direction from the origin

• ZZW is the z coordinate of the high face of the current slab.