Multizone definition

Generated from SU2 commit 6b54b78464 on 2026-10-23. Do not edit this page. Edit the comment above the option in Common/src/CConfig.cpp instead.

CONFIG_LIST

DESCRIPTION List of config files for each zone in a multizone setup with SOLVER=MULTIPHYSICS Order here has to match the order in the meshfile if just one is used.

Type: list of strings
In config_template.cfg: CONFIG_LIST= (configA.cfg, configB.cfg, ...)
Mentioned in: Basics of Multi-Zone Computations, Setup Guide: Heat Transfer and Conjugate Heat Transfer, Setup Guide: Turbomachinery, Aachen turbine stage with Mixing-plane, Solid-to-Solid Conjugate Heat Transfer with Contact Resistance, Static Fluid-Structure Interaction (FSI)
Used in 46 test case files, for example: cht_2d_3cylinders.cfg ((flow_cylinder.cfg, solid_cylinder1.cfg, solid_cylinder2.cfg, solid_cylinder3.cfg)), chtMaster.cfg (( fluid.cfg, solid.cfg )), circles.cfg ((zone_1.cfg, zone_2.cfg))
Code: CConfig.cpp line 2802

TIME_DOMAIN

Determines if the multizone problem is solved for time-domain.

More in config_template.cfg: Time domain simulation

Type: YES / NO
Default: NO
In config_template.cfg: TIME_DOMAIN= NO
Mentioned in: Changes in Version 8, Guide to Version v7, History and Solution Output, Hybrid RANS/LES (DES), Setup Guide: Heat Transfer and Conjugate Heat Transfer, Setup Guide: Incompressible Flows and 9 more
Used in 71 test case files, for example: aeroelastic_NACA64A010.cfg (YES), cht_2d_3cylinders.cfg (NO)
Code: CConfig.cpp line 2805

OUTER_ITER

Number of outer iterations in the multizone problem.

More in config_template.cfg: Maximum number of outer iterations (only for multizone problems)

Type: integer
Default: 1
In config_template.cfg: OUTER_ITER= 1
Mentioned in: Guide to Version v7, History and Solution Output, Setup Guide: Heat Transfer and Conjugate Heat Transfer, Setup Guide: Turbomachinery, Static Fluid-Structure Interaction (FSI), Unsteady Conjugate Heat Transfer
Used in 49 test case files, for example: inv_NACA0012_discadj_multizone.cfg (150), cht_2d_3cylinders.cfg (11), chtMaster.cfg (100)
Code: CConfig.cpp line 2807

INNER_ITER

Number of inner iterations in each multizone block.

More in config_template.cfg: Maximum number of inner iterations

Type: integer
Default: 1
In config_template.cfg: INNER_ITER= 9999
Mentioned in: Guide to Version v7, History and Solution Output, Setup Guide: Heat Transfer and Conjugate Heat Transfer, Setup Guide: Incompressible Flows, Setup Guide: Laminar-Turbulent Transition, Setup Guide: Non-Ideal Compressible Flows and 11 more
Used in 91 test case files, for example: aeroelastic_NACA64A010.cfg (100), backwardStep.cfg (20), inv_NACA0012_discadj_multizone.cfg (1)
Code: CConfig.cpp line 2809

TIME_ITER

Number of time steps solved in the multizone problem.

More in config_template.cfg: Maximum number of time iterations

Type: integer
Default: 1
In config_template.cfg: TIME_ITER= 1
Mentioned in: Aeroacoustic analysis of unsteady pressure, Guide to Version v7, History and Solution Output, Setup Guide: Heat Transfer and Conjugate Heat Transfer, Setup Guide: Incompressible Flows, Setup Guide: Unsteady Flows and DES and 5 more
Used in 61 test case files, for example: aeroelastic_NACA64A010.cfg (360), backwardStep.cfg (50000), chtMaster.cfg (54)
Code: CConfig.cpp line 2811

ITER

Number of iterations in each single-zone block.

More in config_template.cfg: Number of iterations for single-zone problems

Type: integer
Default: 1000
In config_template.cfg: ITER= 1
Mentioned in: Guide to Version v7, History and Solution Output, Setup Guide: Heat Transfer and Conjugate Heat Transfer, Setup Guide: Incompressible Flows, Setup Guide: Laminar-Turbulent Transition, Setup Guide: Non-Ideal Compressible Flows and 9 more
Used in 235 test case files, for example: air_nozzle_restart.cfg (3000), air_nozzle_species.cfg (15), config.cfg (1)
Code: CConfig.cpp line 2813

RESTART_ITER

Restart iteration in the multizone problem.

More in config_template.cfg: Iteration number to begin unsteady restarts

Type: integer
Default: 1
In config_template.cfg: RESTART_ITER= 0
Mentioned in: Hybrid RANS/LES (DES), Restart File, Setup Guide: Unsteady Flows and DES, Solver Setup, Unsteady NACA0012
Used in 27 test case files, for example: chtMaster.cfg (2), inv_NACA0012_pitching.cfg (10), configBeam_2d.cfg (1)
Code: CConfig.cpp line 2815

TIME_STEP

Minimum error threshold for the linear solver for the implicit formulation

More in config_template.cfg: Time Step for dual time stepping simulations (s) – Only used when UNST_CFL_NUMBER = 0.0 For the DG-FEM solver it is used as a synchronization time when UNST_CFL_NUMBER != 0.0

Type: real number
Default: 0.0
In config_template.cfg: TIME_STEP= 0.0
Mentioned in: Changes in Version 8, Guide to Version v7, History and Solution Output, Setup Guide: Heat Transfer and Conjugate Heat Transfer, Setup Guide: Incompressible Flows, Setup Guide: Unsteady Flows and DES and 8 more
Used in 68 test case files, for example: aeroelastic_NACA64A010.cfg (0.00174532925199), backwardStep.cfg (2.82E-6), chtMaster.cfg (500)
Code: CConfig.cpp line 2817

MAX_TIME

Total Physical Time for time-domain problems (s)

More in config_template.cfg: Total Physical Time for dual time stepping simulations (s)

Type: real number
Default: 1.0
In config_template.cfg: MAX_TIME= 50.0
Mentioned in: Changes in Version 8, Guide to Version v7, Setup Guide: Heat Transfer and Conjugate Heat Transfer, Setup Guide: Unsteady Flows and DES, Solver Setup, Unsteady von Karman vortex shedding
Used in 46 test case files, for example: aeroelastic_NACA64A010.cfg (50.0), chtMaster.cfg (1e9), cht_2d_3cylinders.cfg (100.0)
Code: CConfig.cpp line 2819

SPECIAL_OUTPUT

Determines if the special output is written out

Type: YES / NO
Default: NO
In config_template.cfg: SPECIAL_OUTPUT= NO
Code: CConfig.cpp line 2821

WRT_ZONE_CONV

Determines if the convergence history of each individual zone is written to screen

Type: YES / NO
Default: NO
In config_template.cfg: WRT_ZONE_CONV= NO
Mentioned in: History and Solution Output, Setup Guide: Heat Transfer and Conjugate Heat Transfer, Static Fluid-Structure Interaction (FSI)
Used in 11 test case files, for example: circles.cfg (NO), lam_prem_ch4_cht_dot_master.cfg (YES)
Code: CConfig.cpp line 2824

WRT_ZONE_HIST

Determines if the convergence history of each individual zone is written to file

Type: YES / NO
Default: NO
In config_template.cfg: WRT_ZONE_HIST= NO
Mentioned in: Setup Guide: Heat Transfer and Conjugate Heat Transfer, Setup Guide: Turbomachinery, Aachen turbine stage with Mixing-plane, Static Fluid-Structure Interaction (FSI)
Used in 13 test case files, for example: circles.cfg (YES)
Code: CConfig.cpp line 2826

WRT_FORCES_BREAKDOWN

Determines if the forces breakdown is written out

Type: YES / NO
Default: NO
In config_template.cfg: WRT_FORCES_BREAKDOWN= NO
Mentioned in: Setup Guide: Laminar-Turbulent Transition, Setup Guide: Steady RANS for External Aerodynamics
Used in 8 test case files, for example: config.cfg (NO), MFR_coupling.cfg (YES)
Code: CConfig.cpp line 2829

KIND_INTERPOLATION

\par KIND_INTERPOLATION Type of interpolation to use for multi-zone problems.

More in config_template.cfg: Kind of interface interpolation among different zones (NEAREST_NEIGHBOR, WEIGHTED_AVERAGE, ISOPARAMETRIC, RADIAL_BASIS_FUNCTION)

Type: one of the values below
Values: NEAREST_NEIGHBOR, ISOPARAMETRIC, WEIGHTED_AVERAGE, RADIAL_BASIS_FUNCTION
Default: NEAREST_NEIGHBOR
In config_template.cfg: KIND_INTERPOLATION= NEAREST_NEIGHBOR
Mentioned in: Setup Guide: Heat Transfer and Conjugate Heat Transfer
Used in 11 test case files, for example: configFEA.cfg (RADIAL_BASIS_FUNCTION), channel_2D_WA.cfg (WEIGHTED_AVERAGE), single_stage_NN.cfg (ISOPARAMETRIC)
Code: CConfig.cpp line 2836

CONSERVATIVE_INTERPOLATION

Use conservative approach for interpolating between meshes.

Type: YES / NO
Default: YES
In config_template.cfg: CONSERVATIVE_INTERPOLATION= YES
Used in 4 test case files, for example: config.cfg (NO), configFEA.cfg (YES)
Code: CConfig.cpp line 2839

NUM_NEAREST_NEIGHBORS

No description in the code yet.

Type: integer
Default: 1
Not in config_template.cfg.
Mentioned in: Setup Guide: Heat Transfer and Conjugate Heat Transfer
Code: CConfig.cpp line 2841

KIND_RADIAL_BASIS_FUNCTION

\par KIND_INTERPOLATION Type of radial basis function to use for radial basis function interpolation.

More in config_template.cfg: Type of radial basis function to use for radial basis function interpolation (WENDLAND_C2, INV_MULTI_QUADRIC, GAUSSIAN, THIN_PLATE_SPLINE, MULTI_QUADRIC).

Type: one of the values below
Values: WENDLAND_C2, INV_MULTI_QUADRIC, GAUSSIAN, THIN_PLATE_SPLINE, MULTI_QUADRIC
Default: WENDLAND_C2
In config_template.cfg: KIND_RADIAL_BASIS_FUNCTION = WENDLAND_C2
Mentioned in: Setup Guide: Heat Transfer and Conjugate Heat Transfer
Used in 2 test case files, for example: configFEA.cfg (WENDLAND_C2)
Code: CConfig.cpp line 2847

RADIAL_BASIS_FUNCTION_POLYNOMIAL_TERM

Use polynomial term in radial basis function interpolation. Options: NO, YES

Type: YES / NO
Default: YES
In config_template.cfg: RADIAL_BASIS_FUNCTION_POLYNOMIAL_TERM = YES
Used in 2 test case files, for example: configFEA.cfg (YES)
Code: CConfig.cpp line 2851

RADIAL_BASIS_FUNCTION_PARAMETER

Radius for radial basis function.

Type: real number
Default: 1.0
In config_template.cfg: RADIAL_BASIS_FUNCTION_PARAMETER = 0.015
Used in 3 test case files, for example: def_NACA0012_rbf.cfg (2), configFEA.cfg (0.015)
Code: CConfig.cpp line 2854

RADIAL_BASIS_FUNCTION_PRUNE_TOLERANCE

Tolerance to prune small coefficients from the RBF interpolation matrix.

Type: real number
Default: 1e-6
In config_template.cfg: RADIAL_BASIS_FUNCTION_PRUNE_TOLERANCE = 0
Used in 2 test case files, for example: configFEA.cfg (0)
Code: CConfig.cpp line 2857

INLET_INTERPOLATION_FUNCTION

\par INLETINTERPOLATION Type of spanwise interpolation to use for the inlet face.

More in config_template.cfg: Type of spanwise interpolation to use for the inlet face (LINEAR_1D, AKIMA_1D, CUBIC_1D).

Type: one of the values below
Values: NONE, LINEAR_1D, AKIMA_1D, CUBIC_1D
Default: NONE
In config_template.cfg: INLET_INTERPOLATION_FUNCTION= NONE
Code: CConfig.cpp line 2863

INLET_INTERPOLATION_DATA_TYPE

\par INLETINTERPOLATION Type of spanwise interpolation to use for the inlet face.

More in config_template.cfg: Type of radial spanwise interpolation type for the inlet face (VR_VTHETA or ALPHA_PHI).

Type: one of the values below
Values: VR_VTHETA, ALPHA_PHI
Default: VR_VTHETA
In config_template.cfg: INLET_INTERPOLATION_DATA_TYPE= VRVTHETA
Code: CConfig.cpp line 2869

PRINT_INLET_INTERPOLATED_DATA

Write interpolated inlet vertex data to the file Interpolated_Data_.dat *(from config_template.cfg)*

Type: YES / NO
Default: NO
In config_template.cfg: PRINT_INLET_INTERPOLATED_DATA= NO
Code: CConfig.cpp line 2871

RAMP_FSI_ITER

Number of FSI iterations during which a ramp is applied

Type: integer
Default: 2
In config_template.cfg: RAMP_FSI_ITER= 2
Used in 2 test case files, for example: config.cfg (5)
Code: CConfig.cpp line 2874

STAT_RELAX_PARAMETER

Aitken’s static relaxation factor

More in config_template.cfg: Aitken static relaxation factor

Type: real number
Default: 0.4
In config_template.cfg: STAT_RELAX_PARAMETER= 0.4
Mentioned in: Static Fluid-Structure Interaction (FSI)
Used in 13 test case files, for example: configFEA.cfg (1.0), configFlow.cfg (1), configFEA.cfg (0.7)
Code: CConfig.cpp line 2876

AITKEN_DYN_MAX_INITIAL

Aitken’s dynamic maximum relaxation factor for the first iteration

More in config_template.cfg: Aitken dynamic maximum relaxation factor for the first iteration

Type: real number
Default: 0.5
In config_template.cfg: AITKEN_DYN_MAX_INITIAL= 0.5
Code: CConfig.cpp line 2878

AITKEN_DYN_MIN_INITIAL

Aitken’s dynamic minimum relaxation factor for the first iteration

More in config_template.cfg: Aitken dynamic minimum relaxation factor for the first iteration

Type: real number
Default: 0.5
In config_template.cfg: AITKEN_DYN_MIN_INITIAL= 0.5
Code: CConfig.cpp line 2880

BGS_RELAXATION

Kind of relaxation

Type: one of the values below
Values: NONE, FIXED_PARAMETER, AITKEN_DYNAMIC
Default: NONE
In config_template.cfg: BGS_RELAXATION= NONE
Mentioned in: Static Fluid-Structure Interaction (FSI)
Used in 13 test case files, for example: configFEA.cfg (FIXED_PARAMETER)
Code: CConfig.cpp line 2882

RELAXATION

Relaxation required

Type: YES / NO
Default: NO
In config_template.cfg: RELAXATION= NO
Used in 3 test case files, for example: configFEA.cfg (YES)
Code: CConfig.cpp line 2884

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