How to extract solid deformation of a time point in a transient process and rebuild it in another file?

Hello,
My aim is to make a simulation to observe the change of the optical phase on a optical fiber's outlet in a cycle of sound pressure. And I have a question as follow:
In file.A, I use transient Acoustic-Solid Interaction and Moving Mesh to compute how the solid change in a cycle of sound pressure. In file.B, I want to compute the change of optical phase. In file.B, I assume that solid is static and the density of mesh in file.B is higher than that in file.A, because the frequency of light is higher than the frequency of sound a lot. But the question is that the soild in file.A is not stationary in a time point, so what should I do to rebulid it in file.B?

thanks








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