Fluid_properties
Contents
Data Structure: Fluid_properties |
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Fluid material properties data structure |
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Fluid_properties NUM=ival where ival is the data structure number |
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Overview The fluid material properties data structure defines all the properties specifically related to an individual fluid type. If different fluids are present within the model several fluid property data structures must be defined. At present the flow field is limited to single-phase flow, so that only one fluid can be assigned to each material type (i.e. via Singlephase_fluid on the Material_data structure). This limits the analysis to cases where no fluid mixing occurs.
Notes •Several Fluid_properties data structure may be defined.
Examples Examples demonstrating the usage of Fluid_properties include: •All porous flow examples and coupled examples where the porous flow field is active.
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 | Name Fluid material name |
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Fluid material name (maximum 64 characters)
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| Fluid_type Fluid type (Compulsory) |
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Fluid type. Valid fluid types are: • "Gas" - Compressible gas (stiffness and density defined via an equation of state via Equation_state_type and Equation_state_properties ) • "Water" - nearly incompressible (stiffness and density defined via Stiffness and Density ) • "Oil" - nearly incompressible (stiffness and density defined via Stiffness and Density )
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| Units Units used to define the fluid properties (Optional) |
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Units used to define the fluid properties. Vector dimensioned 4 where: •Location 1 - units for length e.g. ("m", "mm", "in") •Location 2 - units for stress e.g. ("MPa", "KPa", "Pa", "PSI") •Location 3 - units for time e.g. ("s", "hrs", "years", "Ma") •Location 4 - units for temperature e.g. ("Celsius", "Kelvin")
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| Units_viscosity Units for viscosity |
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Units for viscosity; e.g. ("Pa.s")
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| Reference_temperature Reference temperature for material properties |
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Reference temperature for material properties defined in the fluid structure. The reference temperature for a fluid may be different from the reference temperature for a porous material containing the fluid.
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| Equation_state_type Gas Equation of state type (Compulsory for Gases) |
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Gas equation of state type. Valid types are: • 0 - Nearly incompressible liquid • 1 - Ideal Gas
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| Equation_state_properties Equation of state properties (Compulsory for Gases) |
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Equation of state properties. For ideal gas (compressible fluid) density is computed following the equation of state for ideal gases:
For equation of state 1 (Ideal Gas) the properties are: •Location 1 - Gas deviation factor ( Z ≤ 1.01) •Location 2 - Minimum gas pressure - Very low non-zero pressure e.g. 1 Pa
Notes •Definition of the gas universal constant and the molecular mass of the gas is done via Gas_universal_constant and Molecular_weight respectively (compulsory for gases).
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| Stiffness Fluid stiffness if nearly incompressible (Compulsory for Liquids) |
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Fluid stiffness - Required for nearly incompressible liquids (e.g. water, oil)
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| Stiffness_tvar Fluid stiffness temperature variation (Optional) |
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Fluid stiffness temperature variation - Gradient term to define a linear variation of fluid stiffness ( Stiffness ) with temperature i.e.
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| Density Fluid density (Compulsory for Liquids) |
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Fluid density for nearly incompressible fluids (e.g. water, oil)
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| Density_tvar Fluid density temperature variation (Optional) |
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Fluid density temperature variation - Gradient term to define a linear variation of fluid density ( Density ) with temperature i.e.:
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| Gas_universal_constant Gas universal constant (Compulsory for gases) |
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Gas universal constant; i.e. 8.314 (J/mol/K) 8314 (J/kmol/K)
Notes •Definition of Gas_universal_constant is compulsory for gases.
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| Molecular_weight Gas molecular weight (Compulsory for gases) |
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Gas molecular weight (molecular mass)
Notes •Definition of Molecular_weight is compulsory for gases.
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| Viscosity_type Fluid viscosity Type (Optional) |
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Fluid viscosity type: • 1 - Constant viscosity ( Viscosity ) • 2 - Viscosity vs. pressure curve ( Viscosity_vs_pressure ) • 4 - Temperature dependent viscosity (Power law)
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| Viscosity Fluid viscosity (Compulsory) |
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Fluid viscosity (for water is generally 1.00001 MPa·s = 3.171 MPa·Ma)
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| Viscosity_tvar Fluid viscosity temperature variation (Optional) |
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Fluid viscosity temperature variation for use with Viscosity_type 1 only. A Gradient term defines a linear variation of fluid viscosity ( Viscosity ) with temperature i.e.
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| Viscosity_vs_pressure Viscosity vs. pore pressure curve (Optional) |
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Viscosity vs. pore pressure curve. The data is provided as a 2-D table where: •Row 1 - list of pore pressures •Row 2 - Viscosity for each pressure specified in Row 1
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| Viscosity_properties Viscosity properties for nonlinear/temperature dependent laws |
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Viscosity properties for nonlinear/temperature dependent laws. Viscosity properties are required for
Model 4 - Temperature Dependent Viscosity (Power Law) This law is defined as:
where A, B and C are constants.
For water and A =2.414�10-5, B =247.8 and C =140 where temperature is in Kelvin and viscosity is in Pa.s. The viscosity properties comprise: •Location 1 - A •Location 2 - B •Location 3 - C
If model 4 is selected and no viscosity properties are provided then the properties for water are automatically evaluated in the appropriate units.
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| Adsorption_type Gas adsorption model type (Optional) |
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Gas adsorption model type. Valid models are: • 0 - No gas adsorption • 1 - Langmuir isotherm
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| Std_molar_volume Molar volume of a gas (Compulsory if Langmuir Adsorption Used) |
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Molar volume ( Vstd) of gas at standard temperature (273.15K) and pressure (101.325Pa). The molar volume is the volume occupied by one mole of a gas at a given temperature and pressure. It has the SI unit cubic metres per mole (m3/mol) or is sometimes defined in units of (m3/kmol).
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| Langmuir_volume Langmuir gas volume (Compulsory if Langmuir Adsorption Used) |
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Langmuir gas volume ( qL)
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| Langmuir_pressure Langmuir gas pressure (Compulsory if Langmuir Adsorption Used) |
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Langmuir gas pressure ( pL)
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| Knudsen_diffusion_type Knudsen diffusion type (Optional) |
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Knudsen diffusion type, where valid values are: • 0 - No knudsen diffusion • 1 - Klinkenberg Model • 2 - Beskok and Karniadakis Model • 3 - Orthotropic Klinkenberg Model
Notes •See the page Gas Flow on this manual for further information on the different models
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| Knudsen_diffusion_data Knudsen diffusion parameters (Compulsory if Knudsen Diffusion) |
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Knudsen diffusion parameters depending on the model type
Model type 1 - Klinkenberg Model • Location 1 - Slippage parameter ( bk)
Model type 2 - Beskok and Karniadakis Model • Location 1 - Rarefaction coefficient ( α0) • Location 2 - Constant A • Location 3 - Constant B • Location 4 - Slippage factor ( b)
Model type 3 - Orthotropic Klinkenberg Model • Location 1 - Slippage parameter ( bkx) in local material X direction • Location 2 - Slippage parameter ( bky) in local material Y direction • Location 3 - Slippage parameter ( bkz) in local material Z direction
Notes •See the page Gas Flow on this manual for further information on the different models
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| Conductivity Isotropic Fluid conductivity (Only if thermal field active) |
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Isotropic Fluid conductivity
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| Conductivity_tvar Isotropic Fluid conductivity variation with temperature (Optional) |
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Isotropic Fluid conductivity variation with temperature. A Gradient term defines a linear variation of fluid conductivity ( Conductivity ) with temperature i.e.
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| Specific_heat Fluid specific heat (Only if thermal field active) |
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Fluid specific heat
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| Specific_heat_tvar Fluid specific heat variation with temperature (Optional) |
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Fluid specific heat variation with temperature. A Gradient term defines a linear variation of fluid specific heat ( Specific_heat ) with temperature i.e.
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| Therm_exp_coeff Isotropic Fluid thermal expansion coefficient (Optional) |
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Isotropic Fluid thermal expansion coefficient
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| Therm_exp_coeff_tvar Isotropic Fluid thermal expansion coefficient variation with temperature (Optional) |
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Isotropic Fluid thermal expansion coefficient variation with temperature. A Gradient term defines a linear variation of fluid thermal expansion coefficient ( Therm_exp_coeff ) with temperature i.e.
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| Formation_volume_curve Formation volume factor curve |
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Name of Table_gen with formation volume factor curve
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| Liquid_gas_ratio_curve Liquid gas ratio curve |
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Name of Table_gen with liquid gas ratio curve
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