Hi, thanks for your reply, I knew the profile can be used for pressure input for inlet boundary, but I am not sure if it can be used to exert a load force on the bottom surface to push it to move along y axis. In my case, I selected the bottom surface as the dynamic mesh zones, according to my understanding of your comment, I can use the profile to specify the load on bottom surface, and directly create the dynamic mesh zones, then, in simulation the bottom surface will be forced to move along y axis? am I right?nmy settings about dynamic mesh is shown in Figure 3nnFigure 3