advanced_stability_controls#

class ansys.fluent.core.solver.tui_231.main_menu.solution.methods.multiphase_numerics.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.