Variable Naming Conventions

While it is possible to set up the same OpenMDAO multiphysics problem with different sets of variable names, it is preferable for codes solving the same physics to use the same variable names to be more easily interchangeable. This table provides the required names for coupling variables associated with a particular physics in MPhys.

Variable	Associated Solver	MPhys tag	Variable description
x_aero0	Aerodynamic	mphys_coordinates	Aerodynamic surface coordinates (jig shape)
x_aero	Aerodynamic	mphys_coupling	Aerodynamic surface coordinates (deformed)
u_aero	Aerodynamic	mphys_coupling	Aerodynamic surface displacements
f_aero	Aerodynamic	mphys_coupling	Aerodynamic surface forces
T_convect	Aerodynamic	mphys_coupling	Temperature for convective solver at interface
q_convect	Aerodynamic	mphys_coupling	Convective heat flow at interface
x_struct0	Structural	mphys_coordinates	Structural coordinates (jig shape)
u_struct	Structural	mphys_coupling	Structural state vector (displacements)
f_struct	Structural	mphys_coupling	Structural forces
T_conduct	Thermal	mphys_coupling	Temperature at interface (structural side)
q_conduct	Thermal	mphys_coupling	Conductive heat flow at interface (structural side)

To make swapping solvers easier, it is also helpful to share noncoupling variable names if possible:

Variable	Associated Solver	MPhys tag	Variable description
aoa	Aerodynamic	mphys_input	Angle of attack (please include units=’deg’ or ‘rad’ when declared)
yaw	Aerodynamic	mphys_input	Yaw angle (please include units=’deg’ or ‘rad’ when declared)
mach	Aerodynamic	mphys_input	Reference Mach number
reynolds	Aerodynamic	mphys_input	Reference Reynolds number
q_inf	Aerodynamic	mphys_input	Dynamic pressure