[JinZhiyi]

hi，developers and users:

I find a paragraph in your AIAA paper which describe the rotating frame in SU2.

5. Rotating frame and Arbitrary Lagrangian-Eulerian (ALE) formulations

When simulating fluid flow about certain aerodynamic bodies that operate under an imposed steady rotation, including many turbomachinery, propeller, and rotor applications, it can be advantageous to transform the system of flow equations into a reference frame that rotates with the body of interest.19,20,29 With this transformation, a flow field that is unsteady when viewed from the inertial frame can be solved for in a steady manner, and thus more eciently, without the need for grid motion.


You mentioned in the last a steady rotating simulation don't need grid motion.
However, in the rot_caradonna_tung rotating testcase you provide, in the config file:

------------------------ GRID DEFORMATION PARAMETERS ------------------------%
%
% Kind of deformation (NO_DEFORMATION, HICKS_HENNE, PARABOLIC, NACA_4DIGITS,
% DISPLACEMENT, ROTATION, FFD_CONTROL_POINT,
% FFD_DIHEDRAL_ANGLE, FFD_TWIST_ANGLE,
% FFD_ROTATION, FFD_CAMBER, FFD_THICKNESS, FFD_VOLUME)
DV_KIND= FFD_TWIST_ANGLE
%
% Marker of the surface in which we are going apply the shape deformation
DV_MARKER= ( quad_blade, tri_blade )



Why grid deformation still needed?

Tanks in advance.


Jin