advanced_stability_controls#

class ansys.fluent.core.solver.tui_231.main_menu.solve.set.multiphase_numerics.advanced_stability_controls(path, service)#

Bases: TUIMenu

Enters the menu for the stability controls for multiphase flows. For more information about the below option, see and .

Classes:

`anti_diffusion`(path, service)	Enters the anti-diffusion menu.
`equation_order`(path, service)	Enters the equation order menu for homogeneous multiphase flow models.
`hybrid_nita`(path, service)	Enters the equation order menu for homogeneous multiphase flow models.
`num_ventilation`(path, service)	Numerical Ventilation Menu for VOF Model.
`p_v_coupling`(path, service)	Enters the menu for the pressure-velocity coupling controls.
`pseudo_time`(path, service)	Pseudo-Time stability controls for multiphase flow.

class anti_diffusion(path, service)#

Bases: TUIMenu

Enters the anti-diffusion menu. This item is available for VOF cases with the Interfacial Anti-Diffusion option enabled.

Methods:

`enable_dynamic_strength`(args, *kwargs)	Enables dynamic strength to reduce compression in the direction tangential to the interface.
`set_dynamic_strength_exponent`(args, *kwargs)	Sets the cosine exponent in the dynamic strength treatment in ).
`set_maximum_dynamic_strength`(args, *kwargs)	Sets the maximum value of dynamic anti-diffusion strength in ).

enable_dynamic_strength(*args, **kwargs)#: Enables dynamic strength to reduce compression in the direction tangential to the interface.

set_dynamic_strength_exponent(*args, **kwargs)#: Sets the cosine exponent in the dynamic strength treatment in ).

set_maximum_dynamic_strength(*args, **kwargs)#: Sets the maximum value of dynamic anti-diffusion strength in ).

class equation_order(path, service)#

Bases: TUIMenu

Enters the 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)	When enabled, solves the flow equation at the end of the iteration.

solve_exp_vof_at_end(*args, **kwargs)#: Solve Explicit VOF at the end of time-step as an alternative.

solve_flow_last(*args, **kwargs)#: When enabled, solves the flow equation at the end of the iteration. This improves the behavior at the start of new time-step if the solution does not converge properly.

class hybrid_nita(path, service)#

Bases: TUIMenu

Enters the equation order menu for homogeneous multiphase flow models.

Methods:

`initial_outer_iterations`(args, *kwargs)	Allows you to change the number of initial time-steps and the number of initial outer iterations to control solution stability.
`outer_iterations`(args, *kwargs)	Sets the number of outer iterations.

Classes:

instability_detector(path, service)

Enters the menu for the instability detector controls.

initial_outer_iterations(*args, **kwargs)#: Allows you to change the number of initial time-steps and the number of initial outer iterations to control solution stability.

class instability_detector(path, service)#

Bases: TUIMenu

Enters the menu for the instability detector controls.

Methods:

`enable_instability_detector`(args, *kwargs)	Enables/disables the instability detector to deal with possible instability problems.
`set_cfl_limit`(args, *kwargs)	Sets the Courant number limit for detecting unstable events.
`set_cfl_type`(args, *kwargs)	Selects the CFL number type for detection of an unstable event.
`set_velocity_limit`(args, *kwargs)	Sets the velocity limit for detecting unstable events.
`unstable_event_outer_iterations`(args, *kwargs)	Sets the number of outer iterations for an unstable event.

enable_instability_detector(*args, **kwargs)#: Enables/disables the instability detector to deal with possible instability problems. Once this option is enabled, additional instability detection options become available.

set_cfl_limit(*args, **kwargs)#: Sets the Courant number limit for detecting unstable events. This command becomes available once the enable-instability-detector? text option has been enabled.

set_cfl_type(*args, **kwargs)#: Selects the CFL number type for detection of an unstable event. This command becomes available once the enable-instability-detector? text option has been enabled.

set_velocity_limit(*args, **kwargs)#: Sets the velocity limit for detecting unstable events. This command becomes available once the enable-instability-detector? text option has been enabled.

unstable_event_outer_iterations(*args, **kwargs)#: Sets the number of outer iterations for an unstable event.

outer_iterations(*args, **kwargs)#: Sets the number of outer iterations.

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

Enters the menu for the pressure-velocity coupling controls.

Classes:

`coupled_vof`(path, service)	Enters the stability control menu for VOF cases that involve the Coupled pressure-velocity coupling scheme.
`rhie_chow_flux`(path, service)	Enters the stability controls menu for the Rhie-Chow interpolation.
`skewness_correction`(path, service)	Enters the skewness correction menu.

class coupled_vof(path, service)#

Bases: TUIMenu

Enters the stability control menu for VOF cases that involve the Coupled pressure-velocity coupling scheme.

Methods:

buoyancy_force_linearization(*args, **kwargs)

Allows you to use the linearized buoyancy force and the blended treatment for the buoyancy force.

buoyancy_force_linearization(*args, **kwargs)#: Allows you to use the linearized buoyancy force and the blended treatment for the buoyancy force.

class rhie_chow_flux(path, service)#

Bases: TUIMenu

Enters the stability controls menu for the Rhie-Chow interpolation.

Methods:

low_order_rhie_chow(*args, **kwargs)

Enables/disables the low-order velocity interpolation in the flux calculation.

low_order_rhie_chow(*args, **kwargs)#: Enables/disables the low-order velocity interpolation in the flux calculation.

class skewness_correction(path, service)#

Bases: TUIMenu

Enters the skewness correction menu.

Methods:

limit_pressure_correction_gradient(*args, ...)

Enables/disables the limited pressure correction gradient in skewness terms for the PISO, SIMPLEC, or fractional step pressure-coupling schemes.

limit_pressure_correction_gradient(*args, **kwargs)#: Enables/disables the limited pressure correction gradient in skewness terms for the PISO, SIMPLEC, or fractional step pressure-coupling schemes.

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.