[rocco.bom]

Hello everybody,

This is my very first post on the forum as I'm just approaching all the possibilities offered by SU2, so I'm thanking in advance whoever is going to help me with my issue.

What I want to achieve is an unsteady euler simulation with completely generic moving boundary conditions. Let's say I want to study a 2D airfoil with flap movement while, at the same time, plunging and pitching.
My question is: how do I prescribe the Boundary deformations and motion? And how to prescribe the mesh deformation to follow the boundary movement? I want to underline that my following target is to study the fluid interaction with moving 3D boundaries (not rigid motion).

Up to now, I found pretty good suggestions in the discussion:

Mesh Generating Using Spring Analogy

which however is incomplete and not clear. It is said I should use the command SU2_DEF and operate on the "-GRID DEFORMATION PARAMETERS-" section of the .cfg, prescribing

DV_KIND= SURFACE_FILE

and

MOTION_FILENAME= mesh_motion.dat

where the layout of the mesh_motion remains obscure to me (a set of motion for each time-step? how defined?).

Tutorials for prescribed plunging and pitching of a 2D airfoils suggest to modify the "-DYNAMIC MESH DEFINITION-" section of the .cfg file.
Defining the option

GRID_MOVEMENT_KIND= EXTERNAL

should resolve my problem? Other useful but incomplete suggestions were found in this discussion:

Problem with dynamic mesh (EXTERNAL - 3D)

My ideal prescribed motion would be given by redefining the points of the moving boundary time-step by time-step. Is this possibility implemented in the code?

Thank you