The test problem is the initial stage of a two-dimensional diffraction and reflection of a plane shock wave, impinging on a rectangular obstacle.

所选算例为平面激波遇矩形障碍物初始阶段的绕射与反射。

youdao

Diffraction - not only will a wave of sound reflect or absorb but it can go over the obstacle.

衍射-声音虽然会被反射已经吸收，但是他能绕过阻挡物。

youdao

And when a wave meets an obstacle of about the same size as its wavelength, it is scattered in a process known as diffraction.

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