If the goal is only to change the input speed or different attack angles, you can use the .cas file. Therefore, I think extracting the .msh.h5 file is useless.
The problem of users in using the adjoint solver is the lowering of the mesh quality and the loss of the orthogonality of the mesh elements during the optimization. Therefore, the deformed geometry needs to be meshed in order to ensure the result obtained by the optimizer using the low-quality mesh provided.
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