[liujmljm]

Hi, I am running the SU2-6.2.0 code to test the case of 3D Backward-facing step. Could u please tell me how to set the periodic boundary. Thank u.

[TKatt]

Hi,

currently integrated is only 'spanwise' periodicity. So in case of a 3D backward facing step you would apply the periodic BC to the side walls of the channel, simulating approximately an arbitrary wide channel.

% Periodic boundary marker(s) (NONE = no marker)
% Format: ( periodic marker, donor marker, rotation_center_x, rotation_center_y,
% rotation_center_z, rotation_angle_x-axis, rotation_angle_y-axis,
% rotation_angle_z-axis, translation_x, translation_y, translation_z, ... )
MARKER_PERIODIC= ( NONE )

So for a translational periodicity of e.g. 1.0 in y-direction (say y-coord is your channel width) it would look sth like this

MARKER_PERIODIC= ( left_side, right_side, 0,0,0, 0,0,0, 0,1.0,0 )

or

MARKER_PERIODIC= ( right_side, right_side, 0,0,0, 0,0,0, 0,1.0,0 )

order does not matter there. That is all there is to do, the mesh can stay as is.

Hope that helps,
Tobi

[liujmljm]

thank u very much