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imod.wq.VariableDensityFlow#

class imod.wq.VariableDensityFlow(density_concentration_slope, density_species=1, density_min=1000.0, density_max=1025.0, density_ref=1000.0, density_criterion=0.01, read_density=False, internodal='central', coupling=1, correct_water_table=False)[source]#

Variable Density Flow package.

Parameters

  • density_species (int) – is the MT3DMS species number that will be used in the equation of state to compute fluid density (mtdnconc). If density_species = 0, fluid density is specified using items 6 and 7, and flow will be uncoupled with transport if the IMT Process is active. If density_species > 0, fluid density is calculated using the MT3DMS species number that corresponds with density_species. A value for density_species greater than zero indicates that flow will be coupled with transport. If density_species = -1, fluid density is calculated using one or more MT3DMS species. Items 4a, 4b, and 4c will be read instead of item 4.

  • density_min (float) – is the minimum fluid density (DENSEMIN). If the resulting density value calculated with the equation of state is less than density_min, the density value is set to density_min. If density_min = 0, the computed fluid density is not limited by density_min (this is the option to use for most simulations). If density_min > 0, a computed fluid density less than density_min is automatically reset to density_min.

  • density_max (float) – is the maximum fluid density (DENSEMAX). If the resulting density value calculated with the equation of state is greater than density_max, the density value is set to density_max. If density_max = 0, the computed fluid density is not limited by density_max (this is the option to use for most simulations). If density_max > 0, a computed fluid density larger than density_max is automatically reset to density_max.

  • density_ref (float) – is the fluid density at the reference concentration, temperature, and pressure (DENSEREF). For most simulations, density_ref is specified as the density of freshwater at 25 °C and at a reference pressure of zero. Value of 1000 is often used.

  • density_concentration_slope (float) – is the slope d(rho)/d(C) of the linear equation of state that relates fluid density to solute concentration (denseslp). Value of 0.7143 is often used.

  • density_criterion (float) – is the convergence parameter for the coupling between flow and transport and has units of fluid density (DNSCRIT). If the maximum density difference between two consecutive coupling iterations is not less than density_criterion, the program will continue to iterate on the flow and transport equations or will terminate if ‘coupling’ is exceeded.

  • coupling (int) – is a flag used to determine the flow and transport coupling procedure (nswtcpl). If coupling = 0 or 1, flow and transport will be explicitly coupled using a one-timestep lag. The explicit coupling option is normally much faster than the iterative option and is recommended for most applications. If coupling > 1, coupling is the maximum number of non-linear coupling iterations for the flow and transport solutions. SEAWAT-2000 will stop execution after coupling iterations if convergence between flow and transport has not occurred. If coupling = -1, the flow solution will be recalculated only for: The first transport step of the simulation, or The last transport step of the MODFLOW timestep, or The maximum density change at a cell is greater than density_criterion.

  • correct_water_table (bool) – is a flag used to activate the variable-density water-table corrections (IWTABLE). If correct_water_table = False, the water-table correction will not be applied. If correct_water_table = True, the water-table correction will be applied.

  • internodal (str, {"upstream", "central"}) – is a flag that determines the method for calculating the internodal density values used to conserve fluid mass (MFNADVFD). If internodal = “central”, internodal conductance values used to conserve fluid mass are calculated using a central-in-space algorithm. If internodal = “upstream”, internodal conductance values used to conserve fluid mass are calculated using an upstream-weighted algorithm.

__init__(density_concentration_slope, density_species=1, density_min=1000.0, density_max=1025.0, density_ref=1000.0, density_criterion=0.01, read_density=False, internodal='central', coupling=1, correct_water_table=False)[source]#

Methods

__init__(density_concentration_slope[, ...])

from_file(path, **kwargs)

Loads an imod-wq package from a file (currently only netcdf and zarr are supported).

isel()

save(directory)

sel()

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