Tracking Down Vibrations Fast with FSI

With high-speed iterations between mechanical and fluids software, fluid structure interaction quickly pinpointed the cause of damaging vibrations and assessed new designs for offshore oil and gas equipment. First, engineers performed a modal analysis with ANSYS Mechanical software, which calculated relatively low first natural frequencies in the range of 15 Hz to 25 Hz. The mode shapes from this analysis indicated that the maximum vibration amplitude would occur in the lower cone of each structure. Next, the engineering team performed a fluid structure interaction (FSI) simulation to study the turbulent flow of exhaust gases through the stack and the resulting pressure fluctuations on the sidewalls.

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