Automatic Differentation options

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.

DIRECT_DIFF

Direct differentiation mode (forward)

• Type: one of the values below
• Values: NONE, MACH, AOA, PRESSURE, TEMPERATURE, DENSITY, TURB2LAM, SIDESLIP, VISCOSITY, REYNOLDS, DESIGN_VARIABLES, YOUNG_MODULUS, POISSON_RATIO, STRUCTURAL_DENSITY, STRUCTURAL_DEAD_LOAD, ELECTRIC_FIELD
• Default: NONE
• Not in config_template.cfg.
• Used in 1 test case file, for example: cylinder_Windowing.cfg (DESIGN_VARIABLES)
• Code: CConfig.cpp line 3017

AUTO_DIFF

Automatic differentiation mode (reverse)

• Type: YES / NO
• Default: NO
• Not in config_template.cfg.
• Code: CConfig.cpp line 3020

PREACC

Preaccumulation in the AD mode.

• Type: YES / NO
• Default: YES
• In config_template.cfg: PREACC= YES
• Code: CConfig.cpp line 3023

CHECK_TAPE_TYPE

Specify the tape which is checked in a tape debug run.

More in config_template.cfg: Specify the kind of tape that is checked (OBJECTIVE_FUNCTION_TAPE, FULL_SOLVER_TAPE)

• Type: one of the values below
• Values: OBJECTIVE_FUNCTION_TAPE, FULL_SOLVER_TAPE
• Default: FULL_SOLVER_TAPE
• In config_template.cfg: CHECK_TAPE_TYPE = FULL_SOLVER_TAPE
• Mentioned in: Changes in Version 8
• Code: CConfig.cpp line 3026

CHECK_TAPE_VARIABLES

Specify the tape which is checked in a tape debug run.

More in config_template.cfg: Specify the variables for which the tape is checked (SOLVER_VARIABLES, SOLVER_VARIABLES_AND_MESH_COORDINATES)

• Type: one of the values below
• Values: SOLVER_VARIABLES, MESH_COORDINATES
• Default: SOLVER_VARIABLES
• In config_template.cfg: CHECK_TAPE_VARIABLES = SOLVER_VARIABLES
• Mentioned in: Changes in Version 8
• Code: CConfig.cpp line 3029