Federico Alzamora Previtali

If this is a Steady case and the Pseudo Time method is set to Global Time step, then it is likely that your Fluid Time scale is limiting the advancement of the solution in the solid.

In Solution tab > Methods, check the Pseudo Time Method. If set to Global Time step, go to Solution tab > Run Calculation... and increase the Solid Time Scale factor. Start by increasing it by a factor of 10 and run your simulation. See if there are any improvements. If the solution is stable, you may increase the factor beyond this.