Relaxation Shapes - orientation
 

Hi! Everyone!
I am a new beginner of using waves2Foam. I got a confusing understanding of the definition of Relaxation Shapes.

For example, when I do a 2D wave model for the relaxationZone as following:

relaxationZone
{
relaxationShape Rectangular;

relaxType INLET;
startX (90 90 0);
endX (100 100 0);
orientation (0 1 0);
}

The wave generation zone starts from point X1=(90 90 0) and ends at (100 100 0). This makes sense for me. However, I can not understand the meaning of orientation (0 1 0). Does it mean the wave propagation is on Y direction? Rather than (1 0 0), the wave propagates along X direction (from left to right), and its inner product with (endX - startX) is still larger than 0.

Can anyone help me to fix my confusion on the physical definition of "orientation"?

Cheers!

zuodong