Solver

Set solver mode, run parameters, and file paths.

`[lst.solver]`

Set solver formulation choices.

Key	Type	Default	Description
`type`	`int`	`1`	Solver type
`is_simplified`	`bool`	`false`	Use simplified equations
`alpha_i_threshold`	`float`	`-100.0`	Threshold used in alpha_i filtering
`generalized`	`int`	`0`	Generalized eigenproblem switch
`spatial_temporal`	`int`	`1`	Spatial (1) or temporal (0) analysis
`energy_formulation`	`int`	`1`	Energy equation formulation

`[lst.options]`

Set geometry-specific or curvature-related solver switches.

Key	Type	Default	Description
`geometry_switch`	`int`	-	Geometry mode switch
`longitudinal_curvature`	`int`	`0`	Enable longitudinal curvature terms

`[lst.params]`

Set LST parameters

Key	Type	Default	Description
`ny`	`int`	`150`	Number of wall-normal grid points
`yl_in`	`float`	`0.0`	Initial wall-normal location
`tol_lst`	`float`	`1e-5`	Convergence tolerance
`max_iter`	`int`	`15`	Maximum iterations
`x_s`	`float`	-	Start streamwise location
`x_e`	`float`	-	End streamwise location
`i_step`	`int`	-	Streamwise index stride
`tracking_dir`	`int`	`1`	Tracking direction flag
`f_min`	`float`	-	Minimum frequency [Hz]
`f_max`	`float`	-	Maximum frequency [Hz]
`d_f`	`float`	-	Frequency step [Hz]
`f_init`	`float`	`0.0`	Tracking initialization frequency [Hz]
`beta_s`	`float`	-	Start spanwise wavenumber
`beta_e`	`float`	-	End spanwise wavenumber
`d_beta`	`float`	-	Spanwise wavenumber step
`beta_init`	`float`	`0.0`	Tracking initialization spanwise wavenumber
`alpha_0`	`complex`	`(0, 0)`	Initial complex alpha guess

`[lst.io]`

Set file names (recommended: keep defaults)

Key	Type	Default	Description
`baseflow_input`	`str`	`"meanflow.bin"`	Converted base flow file
`solution_output`	`str`	`"growth_rate.dat"`	LST output file

Example

[lst.solver]
type               = 1
spatial_temporal   = 1
energy_formulation = 1

[lst.params]
ny     = 150
x_s    = 0.10
x_e    = 0.60
i_step = 1
f_min  = 50000
f_max  = 400000
d_f    = 10000

[lst.io]
baseflow_input  = "meanflow.bin"
solution_output = "growth_rate.dat"