Reference Set

Contents

Reference Set

Description

Here the keyword *REFERENCE SET to store a reference state for state variables is defined. *REFERENCE SET allows the state for the specified variables at a particular time to be stored and maintained throughout the solution. Both this state data and the difference between the current state and the reference state can be output to the plot file for visualisation. Data is automatically mapped between meshes if adaptive refinement is used.

REFERENCE SET Definition of Reference Set

Usage

*REFERENCE SET, NAME=Reference_set_name, OUTPUT CHANGE=Yes/No, OUTPUT REFERENCE=Yes/No

Description

Defines Reference Set data to store the state of specified variables. This will generate ParaGeo Reference_set_data structure.

Optional Parameters

OUTPUT CHANGE

Defines whether the change on the specified variables between the current state and the reference state should be output to the plot file. Valid options are:

- YES (default)

- NO

OUTPUT REFERENCE

Defines whether the stored reference state for the specified variables should be output to the plot file. Valid options are:

- YES

- NO (default)

Sub-Keywords

List of groups for which reference state will be stored

List of state variables to be stored in the reference set

Usage

*STATE VARIABLES

Description

Define a list of the state variables that will be stored on the reference set and output in the plot file. The list should be provided separated by commas. Valid state variables are:

Decompaction State Variables

D_depcur	Current depth for decompaction
D_depref	Reference depth for decompaction (current time)
D_depprv	Decompaction depth at previous step
D_strnv	Decompaction volume strain increment
D_porchg	Prescribed porosity change due to decompaction
D_stn11t	Decompaction volume strain 11 component
D_stn22t	Decompaction volume strain 22 component
D_porprv	Decompaction porosity depth at time t
D_popstp	Decompaction porosity change over the decompaction step

Diagenesis State Variables

C_poros	Non-mechanical porosity change
C_poros1	Non-mechanical porosity change - Reaction 1
C_poros2	Non-mechanical porosity change - Reaction 2
C_poros3	Non-mechanical porosity change - Reaction 3
C_poros4	Non-mechanical porosity change - Reaction 4

Elastic State Variables

Young	Young modulus
Poiss	Poisson ratio
Young12	Young modulus E12
Young23	Young modulus E23
Young31	Young modulus E31
Poiss12	Poisson's ratio v12
Poiss23	Poisson's ratio v23
Poiss31	Poisson's ratio v31
Shear12	Shear modulus G12
Shear23	Shear modulus G23
Shear31	Shear modulus G31

Hardening State Variables

H_lambda	Lamda (slope of compression line)
H_epvcom	Maximum compressive volume strain
H_epvten	Maximum tensional volume strain

Plastic State Variables

P_flag	Plasticity flag
P_strn	Effective plastic strain
P_strn_r	Effective plastic strain rate
P_strnv	Plastic volume strain
P_strnxx	Plastic strain XX
P_strnyy	Plastic strain YY
P_strnzz	Plastic strain ZZ
P_strnxy	Plastic strain XY
P_strnyz	Plastic strain YZ
P_strnzx	Plastic strain ZX
P_epvcom	Maximum compressive volume strain
P_epvten	Maximum tensile volume strain
P_conver	Convergence flag
P_comc	Pre-consolidation pressure
P_tenc	Tensile intercept
P_state	Plastic state
P_stten	Plastic state tension
P_stshr	Plastic state shear
P_stcap	Plastic state cap
H_lambda	Hardening modulus

Poroelastic State Variables

E_kappa

Kappa (unloading-reloading line slope)

Porous Flow State Variables

Flu_satu	Fluid saturation
Biot_con	Biot constant
Flu_visc	Fluid viscosity
Flu_dens	Fluid density
Perm_x	Permeability in X
Perm_y	Permeability in Y
Perm_z	Permeability in Z
Perm_e	Isotropic permeability
Storty	Storativity
Knud_num	Knudsen number
Knud_rar	Knudsen rarefaction coefficient
Knud_mul	Knudsen permeability multiplier
Knud_numx	Knudsen number in X
Knud_numy	Knudsen number in Y
Knud_numz	Knudsen number in Z
Knud_rarx	Knudsen rarefaction coefficient in X
Knud_rary	Knudsen rarefaction coefficient in Y
Knud_rarz	Knudsen rarefaction coefficient in Z
Knud_mulx	Knudsen permeability multiplier in X
Knud_muly	Knudsen permeability multiplier in Y
Knud_mulz	Knudsen permeability multiplier in Z

Thermal State Variables

Condb	Bulk conductivity
Condb_x	Bulk conductivity in X
Condb_y	Bulk conductivity in Y
Condb_z	Bulk conductivity in Z
Sheatb	Bulk specific heat
Condg	Grain conductivity
Condg_x	Grain conductivity in X
Condg_y	Grain conductivity in Y
Condg_z	Grain conductivity in Z
Sheatg	Grain specific heat
Condf	Fluid conductivity
Sheatf	Fluid specific heat
Peclet	Peclet number

Viscoplastic State Variables

V_strn	Viscoplastic strain
V_strn_r	Viscoplastic strain rate
V_strnv	Viscoplastic volume strain
V_strnxx	Viscoplastic strain XX
V_strnyy	Viscoplastic strain XX
V_strnzz	Viscoplastic strain XX
V_strnxy	Viscoplastic strain XX
V_strnyz	Viscoplastic strain XX
V_strnzx	Viscoplastic strain XX
V_strs	Viscoplastic stress
V_viscos	Viscoplastic viscosity

List of element variables to be stored in the reference set

List of nodal variables to be stored in the reference set

Examples

*REFERENCE SET, NAME=Initial, OUTPUT REFERENCE=Yes

*GROUPS

Shale1, Reservoir1, Shale2

*ELEMENT VARIABLES

Porosity, Strn_xx, Strn_yy, Strn_zz

1A reference state named "Initial" will be created.

2Both the change in specified variables and the reference state will be output.

3Reference set will be created for groups Shale1, Reservoir1 and Shale2 whereas all other groups for the problem will not be referenced

4Porosity and total strain in X, Y and Z will be stored in the reference set and output to the plot file (as well as their ongoing change during the simulation)