Mr. Dave,

I am doing a modal analysis for a two-phase slug flow line, my client requirement is that the piping system natural frequency shall be more than 5 Hz. So, in the dynamic control parameter option, when i enter the stiffness friction factor as 0, the natural frequency of the system is very less (say less than 0.5 Hz), when i enter the stiffness as 100 or 1000, the frequency reaches more than 5 Hz.

As discussed by you in the earlier forum posts, i agree with your suggestions, but the only requirement is, on what basis we can select the stiffness value as 100 or 1000. Since there is no backup for it, our client is not accepting to proceed with 100 or 1000, so i kindly request the Coade to provide a suggestion in the Caesar-II help guide to use the stiffness factor for friction in the range of 0 to 1000 or more.

Thankyou.