Thank you for the response. I have validated the model and all results match the results that I am comparing with, except this plot. So, I am pretty confident that my boundary conditions and mesh are correct. Also, this is computational data, the person used Ansys 17 to get the results. It's the pressure force, as I need its x-component and pressure being a scalar quantity, it cannot be decomposed. 

Is there any other way to get the pressure force along the wave wall? what am I doing wrong?