Dear Saurabh,

It may be that your vessel is not susecptible to vortex shedding. When the job was being analyzed, you may have seen the box that stated "Vortex Shedding will not be a problem and will cause excessive loads". It then goes on to ask if you want to continue to use those loads. If you say Yes, then the loads will be very high. Essentially, when this happens you are forcing the tower vibrate when it does not really want to. Try re-running the calculation and say no to the prompt and study the new results.