I want to simulate flow over a flexible blunt body in which the nodes on the moving boundary move only along y direction. In the boundary detail option, I set the mesh motion to the specified displacement and set the x and z component equal to 0. For y component, I use a very simple relation. I do not know why the x coordinate of the nodes on the moving boundary are changed while I want x coordinates to be fixed. Please tell me how to fix x coordinate of the nodes on the moving boundary.
With best regards
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