HinnWe should get the correct frequencies - here is a paper that I have modeled and benchmarked against in the past (https://www.researchgate.net/publication/242261341_EFFECT_OF_ADDED_MASS_ON_SUBMERGED_VIBRATED_PLATES) and we can match the experimental results (5th plate in that paper) even for one solid186 through the thickness. I would suggest to try and do this as shown below using shared topology and multibody parts to have coincident nodes between fluid and plate. n
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