multiphase_numerics#

class ansys.fluent.core.solver.tui_231.main_menu.solution.methods.multiphase_numerics(path, service)#

Bases: TUIMenu

Enter the multiphase numerics options menu.

Classes:

advanced_stability_controls(path, service)

Stability controls for multiphase flow.

boiling_parameters(path, service)

Multiphase boiling parameters menu.

compressible_flow(path, service)

Multiphase compressible numerics options menu.

default_controls(path, service)

Multiphase default controls menu.

face_pressure_controls(path, service)

Enter the face pressure expert controls menu.

heat_mass_transfer(path, service)

Multiphase interphase heat and mass transfer numerics options menu.

porous_media(path, service)

Multiphase miscellaneous porous media numerics menu.

solution_stabilization(path, service)

VOF solution stabilization menu.

viscous_flow(path, service)

Multiphase viscous flow numerics options menu.
class advanced_stability_controls(path, service)#

Bases: TUIMenu

Stability controls for multiphase flow.

Classes:

anti_diffusion(path, service)

Anti Diffusion Menu for VOF/Multi-Fluid VOF Models.

equation_order(path, service)

Equation Order Menu for Homogeneous Multiphase Flow Models.

hybrid_nita(path, service)

Hybrid NITA stability controls for multiphase flow.

num_ventilation(path, service)

Numerical Ventilation Menu for VOF Model.

p_v_coupling(path, service)

Pressure velocity coupling controls for multiphase flow.

pseudo_time(path, service)

Pseudo-Time stability controls for multiphase flow.
class anti_diffusion(path, service)#

Bases: TUIMenu

Anti Diffusion Menu for VOF/Multi-Fluid VOF Models.

Methods:

enable_dynamic_strength(*args, **kwargs)

Enable dynamic strength to reduce compression in the tangential direction to the interface.

set_dynamic_strength_exponent(*args, **kwargs)

Set cosine exponent in dynamic strength treatment.

set_maximum_dynamic_strength(*args, **kwargs)

Set maximum value of dynamic anti-diffusion strength.
enable_dynamic_strength(*args, **kwargs)#

Enable dynamic strength to reduce compression in the tangential direction to the interface.

set_dynamic_strength_exponent(*args, **kwargs)#

Set cosine exponent in dynamic strength treatment.

set_maximum_dynamic_strength(*args, **kwargs)#

Set maximum value of dynamic anti-diffusion strength.

class equation_order(path, service)#

Bases: TUIMenu

Equation Order Menu for Homogeneous Multiphase Flow Models.

Methods:

solve_exp_vof_at_end(*args, **kwargs)

Solve Explicit VOF at the end of time-step as an alternative.

solve_flow_last(*args, **kwargs)

Solve flow equation at the end of iteration as an alternative.
solve_exp_vof_at_end(*args, **kwargs)#

Solve Explicit VOF at the end of time-step as an alternative.

solve_flow_last(*args, **kwargs)#

Solve flow equation at the end of iteration as an alternative.

class hybrid_nita(path, service)#

Bases: TUIMenu

Hybrid NITA stability controls for multiphase flow.

Methods:

initial_outer_iterations(*args, **kwargs)

Set hybrid nita start-up controls.

outer_iterations(*args, **kwargs)

Set number of outer iterations in hybrid nita.

Classes:

instability_detector(path, service)

Set Hybrid NITA instability detector controls.
initial_outer_iterations(*args, **kwargs)#

Set hybrid nita start-up controls.

class instability_detector(path, service)#

Bases: TUIMenu

Set Hybrid NITA instability detector controls.

Methods:

enable_instability_detector(*args, **kwargs)

Enable instability detector for better stability.

set_cfl_limit(*args, **kwargs)

Set Courant Number limit for detection of unstable event.

set_cfl_type(*args, **kwargs)

Set Courant Number type for detection of unstable event.

set_velocity_limit(*args, **kwargs)

Set velocity limit for detection of unstable event.

unstable_event_outer_iterations(*args, **kwargs)

Set number of outer iterations for unstable event.
enable_instability_detector(*args, **kwargs)#

Enable instability detector for better stability.

set_cfl_limit(*args, **kwargs)#

Set Courant Number limit for detection of unstable event.

set_cfl_type(*args, **kwargs)#

Set Courant Number type for detection of unstable event.

set_velocity_limit(*args, **kwargs)#

Set velocity limit for detection of unstable event.

unstable_event_outer_iterations(*args, **kwargs)#

Set number of outer iterations for unstable event.

outer_iterations(*args, **kwargs)#

Set number of outer iterations in hybrid nita.

class num_ventilation(path, service)#

Bases: TUIMenu

Numerical Ventilation Menu for VOF Model.

Methods:

enable(*args, **kwargs)

Enable numerical ventilation treatment to remove trapped phase adjacent to wall.

near_wall_treatment_options(*args, **kwargs)

Set near wall treatment options.

tau_estimation_options(*args, **kwargs)

Set time step size option for numerical ventilation treatment.

trapped_phase_vof_max(*args, **kwargs)

Set trapped phase maximum volume fraction to activate numerical ventilation treatment for non-trapped phases.

trapped_phase_vof_min(*args, **kwargs)

Set trapped phase minimum volume fraction to activate numerical ventilation treatment for trapped phase.
enable(*args, **kwargs)#

Enable numerical ventilation treatment to remove trapped phase adjacent to wall.

near_wall_treatment_options(*args, **kwargs)#

Set near wall treatment options.

tau_estimation_options(*args, **kwargs)#

Set time step size option for numerical ventilation treatment.

trapped_phase_vof_max(*args, **kwargs)#

Set trapped phase maximum volume fraction to activate numerical ventilation treatment for non-trapped phases.

trapped_phase_vof_min(*args, **kwargs)#

Set trapped phase minimum volume fraction to activate numerical ventilation treatment for trapped phase.

class p_v_coupling(path, service)#

Bases: TUIMenu

Pressure velocity coupling controls for multiphase flow.

Classes:

coupled_vof(path, service)

Set Coupled VOF stability controls.

rhie_chow_flux(path, service)

Set Rhie-Chow related stability controls.

skewness_correction(path, service)

Skewness correction related stabiity controls for multiphase flow.
class coupled_vof(path, service)#

Bases: TUIMenu

Set Coupled VOF stability controls.

Methods:

buoyancy_force_linearization(*args, **kwargs)

Set buoynacy force linerization options in coupled vof.
buoyancy_force_linearization(*args, **kwargs)#

Set buoynacy force linerization options in coupled vof.

class rhie_chow_flux(path, service)#

Bases: TUIMenu

Set Rhie-Chow related stability controls.

Methods:

low_order_rhie_chow(*args, **kwargs)

Use low order velocity interpolation in flux calculation.
low_order_rhie_chow(*args, **kwargs)#

Use low order velocity interpolation in flux calculation.

class skewness_correction(path, service)#

Bases: TUIMenu

Skewness correction related stabiity controls for multiphase flow.

Methods:

limit_pressure_correction_gradient(*args, ...)

Use limited pressure correction gradient in skewness corrections for better stability.
limit_pressure_correction_gradient(*args, **kwargs)#

Use limited pressure correction gradient in skewness corrections for better stability.

class pseudo_time(path, service)#

Bases: TUIMenu

Pseudo-Time stability controls for multiphase flow.

Classes:

auto_dt_advanced_controls(path, service)

Set automatic time-stepping controls for better solution stability.

Methods:

false_time_step_linearization(*args, **kwargs)

Set false time-step linearization for added stability.

smoothed_density_stabilization_method(*args, ...)

Set smoothed density stabilization method.
class auto_dt_advanced_controls(path, service)#

Bases: TUIMenu

Set automatic time-stepping controls for better solution stability.

Methods:

dt_factor_max(*args, **kwargs)

Set maximum limit for increase in pseudo time step size.

dt_factor_min(*args, **kwargs)

Set minimum limit for reduction in pseudo time step size.

dt_init_limit(*args, **kwargs)

Set maximum value for pseudo time step size during first iteration.

dt_max(*args, **kwargs)

Set maximum value for pseudo time step size.

enable(*args, **kwargs)

Enable advanced automatic time stepping for better stability.

max_velocity_ratio(*args, **kwargs)

Set velocity ratio to freeze the time step size for better solution stability.
dt_factor_max(*args, **kwargs)#

Set maximum limit for increase in pseudo time step size.

dt_factor_min(*args, **kwargs)#

Set minimum limit for reduction in pseudo time step size.

dt_init_limit(*args, **kwargs)#

Set maximum value for pseudo time step size during first iteration.

dt_max(*args, **kwargs)#

Set maximum value for pseudo time step size.

enable(*args, **kwargs)#

Enable advanced automatic time stepping for better stability.

max_velocity_ratio(*args, **kwargs)#

Set velocity ratio to freeze the time step size for better solution stability.

false_time_step_linearization(*args, **kwargs)#

Set false time-step linearization for added stability.

smoothed_density_stabilization_method(*args, **kwargs)#

Set smoothed density stabilization method.

class boiling_parameters(path, service)#

Bases: TUIMenu

Multiphase boiling parameters menu.

Methods:

liquid_vof_factor(*args, **kwargs)

Multiphase boiling liquid volume fraction effects.

thin_film(*args, **kwargs)

Multiphase boiling thin film effects.
liquid_vof_factor(*args, **kwargs)#

Multiphase boiling liquid volume fraction effects.

thin_film(*args, **kwargs)#

Multiphase boiling thin film effects.

class compressible_flow(path, service)#

Bases: TUIMenu

Multiphase compressible numerics options menu.

Methods:

alternate_bc_formulation(*args, **kwargs)

Multiphase compressible flow BC alternate method.

enhanced_numerics(*args, **kwargs)

Multiphase enhanced compressible flow numerics options.
alternate_bc_formulation(*args, **kwargs)#

Multiphase compressible flow BC alternate method.

enhanced_numerics(*args, **kwargs)#

Multiphase enhanced compressible flow numerics options.

class default_controls(path, service)#

Bases: TUIMenu

Multiphase default controls menu.

Methods:

recommended_defaults_for_existing_cases(...)

Activate multiphase defaults for loaded case.

revert_to_pre_r20_point_1_default_settings(...)

Revert to pre-R20.1 multiphase flow default settings.
recommended_defaults_for_existing_cases(*args, **kwargs)#

Activate multiphase defaults for loaded case.

revert_to_pre_r20_point_1_default_settings(*args, **kwargs)#

Revert to pre-R20.1 multiphase flow default settings.

class face_pressure_controls(path, service)#

Bases: TUIMenu

Enter the face pressure expert controls menu.

Methods:

face_pressure_options(*args, **kwargs)

Set face pressure options.
face_pressure_options(*args, **kwargs)#

Set face pressure options.

class heat_mass_transfer(path, service)#

Bases: TUIMenu

Multiphase interphase heat and mass transfer numerics options menu.

Methods:

alternative_energy_treatment(*args, **kwargs)

Alternative treatment of latent heat source due to mass transfer.

Classes:

area_density(path, service)

Interfacial area density menu.

boiling(path, service)

Boiling advanced options menu.

cavitation(path, service)

Cavitation numerics options menu.

evaporation_condensation(path, service)

Evaporation-condensation advanced options menu.
alternative_energy_treatment(*args, **kwargs)#

Alternative treatment of latent heat source due to mass transfer.

class area_density(path, service)#

Bases: TUIMenu

Interfacial area density menu.

Methods:

ia_grad_sym(*args, **kwargs)

Interfacial area density gradient-symmetric mechanism.

vof_min_seeding(*args, **kwargs)

Minimum vof seeding for non-zero area density in heat and mass transfer.
ia_grad_sym(*args, **kwargs)#

Interfacial area density gradient-symmetric mechanism.

vof_min_seeding(*args, **kwargs)#

Minimum vof seeding for non-zero area density in heat and mass transfer.

class boiling(path, service)#

Bases: TUIMenu

Boiling advanced options menu.

Methods:

heat_flux_relaxation_factor(*args, **kwargs)

Under-relaxation factor for boiling heat flux.

show_expert_options(*args, **kwargs)

Exposes expert options of min/max superheat along with wetting fraction controls.

two_resistance_boiling_framework(*args, **kwargs)

Allow generalized two-resistance framework for boiling model.
heat_flux_relaxation_factor(*args, **kwargs)#

Under-relaxation factor for boiling heat flux.

show_expert_options(*args, **kwargs)#

Exposes expert options of min/max superheat along with wetting fraction controls.

two_resistance_boiling_framework(*args, **kwargs)#

Allow generalized two-resistance framework for boiling model.

class cavitation(path, service)#

Bases: TUIMenu

Cavitation numerics options menu.

Methods:

display_clipped_pressure(*args, **kwargs)

Clipped pressure is just used for the properties evaluation.

max_vapor_pressure_ratio(*args, **kwargs)

Maximum limit on vapor pressure after turbulence and thermal correction.

min_vapor_pressure(*args, **kwargs)

Minimum vapor pressure limit for cavitation model.

schnerr_cond_coeff(*args, **kwargs)

Condensation coefficient for Schnerr-Sauer model.

schnerr_evap_coeff(*args, **kwargs)

Evaporation coefficient for Schnerr-Sauer model.

turbulent_diffusion(*args, **kwargs)

Enable/disable turbulent diffusion treatment between phases participating in cavitation.
display_clipped_pressure(*args, **kwargs)#

Clipped pressure is just used for the properties evaluation. Mass Transfer Rate uses unclipped pressure.

max_vapor_pressure_ratio(*args, **kwargs)#

Maximum limit on vapor pressure after turbulence and thermal correction.

min_vapor_pressure(*args, **kwargs)#

Minimum vapor pressure limit for cavitation model.

schnerr_cond_coeff(*args, **kwargs)#

Condensation coefficient for Schnerr-Sauer model.

schnerr_evap_coeff(*args, **kwargs)#

Evaporation coefficient for Schnerr-Sauer model.

turbulent_diffusion(*args, **kwargs)#

Enable/disable turbulent diffusion treatment between phases participating in cavitation. This treatment is generally recommended for better solution stability. However, in case of numerical difficulties, it can be disabled.

class evaporation_condensation(path, service)#

Bases: TUIMenu

Evaporation-condensation advanced options menu.

Methods:

ia_norm_min_limit(*args, **kwargs)

Minimum normalized area density below which mass transfer rate is set to zero.

max_rel_humidity(*args, **kwargs)

Maximum value of relative humidity to limit condensation rate.

vof_from_max_limit(*args, **kwargs)

Maximum volume fraction above which mass transfer rate is set to zero.

vof_from_min_limit(*args, **kwargs)

Minimum volume fraction below which mass transfer rate is set to zero.

vof_to_max_limit(*args, **kwargs)

Maximum volume fraction above which mass transfer rate is set to zero.

vof_to_min_limit(*args, **kwargs)

Minimum volume fraction below which mass transfer rate is set to zero.
ia_norm_min_limit(*args, **kwargs)#

Minimum normalized area density below which mass transfer rate is set to zero.

max_rel_humidity(*args, **kwargs)#

Maximum value of relative humidity to limit condensation rate.

vof_from_max_limit(*args, **kwargs)#

Maximum volume fraction above which mass transfer rate is set to zero.

vof_from_min_limit(*args, **kwargs)#

Minimum volume fraction below which mass transfer rate is set to zero.

vof_to_max_limit(*args, **kwargs)#

Maximum volume fraction above which mass transfer rate is set to zero.

vof_to_min_limit(*args, **kwargs)#

Minimum volume fraction below which mass transfer rate is set to zero.

class porous_media(path, service)#

Bases: TUIMenu

Multiphase miscellaneous porous media numerics menu.

Methods:

capillary_pressure_as_diffusion(*args, **kwargs)

Model capillary pressure as diffusion.

relative_permeability(*args, **kwargs)

Multiphase relative permeability fix option.
capillary_pressure_as_diffusion(*args, **kwargs)#

Model capillary pressure as diffusion.

relative_permeability(*args, **kwargs)#

Multiphase relative permeability fix option.

class solution_stabilization(path, service)#

Bases: TUIMenu

VOF solution stabilization menu.

Classes:

additional_stabilization_controls(path, service)

Additional advanced stability controls for VOF.

velocity_limiting_treatment(path, service)

Velocity limiting related stabiity controls for VOF.

Methods:

execute_additional_stability_controls(*args, ...)

Execute additional stability controls for VOF.

execute_advanced_stabilization(*args, **kwargs)

Execute advanced stabilization for VOF.

execute_settings_optimization(*args, **kwargs)

Execute optimized settings for VOF.
class additional_stabilization_controls(path, service)#

Bases: TUIMenu

Additional advanced stability controls for VOF.

Methods:

blended_compressive_scheme(*args, **kwargs)

Blended Compressive discretization scheme for VOF.

pseudo_time_stabilization(*args, **kwargs)

Pseudo-Time Momentum stabilization and False Time Step Linearization methods for VOF.
blended_compressive_scheme(*args, **kwargs)#

Blended Compressive discretization scheme for VOF.

pseudo_time_stabilization(*args, **kwargs)#

Pseudo-Time Momentum stabilization and False Time Step Linearization methods for VOF.

execute_additional_stability_controls(*args, **kwargs)#

Execute additional stability controls for VOF.

execute_advanced_stabilization(*args, **kwargs)#

Execute advanced stabilization for VOF.

execute_settings_optimization(*args, **kwargs)#

Execute optimized settings for VOF.

class velocity_limiting_treatment(path, service)#

Bases: TUIMenu

Velocity limiting related stabiity controls for VOF.

Methods:

enable_velocity_limiting(*args, **kwargs)

Enable velocity limiting treatment.

set_damping_strength(*args, **kwargs)

Enter damping strength.

set_damping_strengths(*args, **kwargs)

Set phase based damping strength.

set_velocity_and_vof_cutoffs(*args, **kwargs)

Set phase based velocity limiting controls.

set_velocity_cutoff(*args, **kwargs)

Enter max velocity magnitude.

verbosity(*args, **kwargs)

Enable verbosity to print number of velocity limited cells during iterations.
enable_velocity_limiting(*args, **kwargs)#

Enable velocity limiting treatment.

set_damping_strength(*args, **kwargs)#

Enter damping strength.

set_damping_strengths(*args, **kwargs)#

Set phase based damping strength.

set_velocity_and_vof_cutoffs(*args, **kwargs)#

Set phase based velocity limiting controls.

set_velocity_cutoff(*args, **kwargs)#

Enter max velocity magnitude.

verbosity(*args, **kwargs)#

Enable verbosity to print number of velocity limited cells during iterations.

class viscous_flow(path, service)#

Bases: TUIMenu

Multiphase viscous flow numerics options menu.

Methods:

interfacial_artificial_viscosity(*args, **kwargs)

Interfacial artifical viscosity controls.

turb_visc_based_damping(*args, **kwargs)

Turbulence viscosity based damping controls.

viscosity_averaging(*args, **kwargs)

Multiphase options for viscosity averaging.
interfacial_artificial_viscosity(*args, **kwargs)#

Interfacial artifical viscosity controls.

turb_visc_based_damping(*args, **kwargs)#

Turbulence viscosity based damping controls.

viscosity_averaging(*args, **kwargs)#

Multiphase options for viscosity averaging.