Dear researchers.

well I am studying a 1 way FSI problem where the input pressure is transient

The Input pressure is a step function where at t0.11s P = 1 bar.

I performed a fluent analysis and recorded the Force over the structure wall and was as expected (Picture attached).

Then I used transient Mechanical APDL to import pressure load values to plot a vertex displacement per time (picture attached)

The issue is that the curve of displacement should not start at t=0. since the pressure start to be applied at t=0.11s

so please where do you think the problem is?

your help is highly apreciated.