Hey Arraythanks for replying :)nI followed the steps shown in the video. nSweep Num Divs is blocked. As the fluid body is present around the Plate. nEven for 1 division it doesn't works. I get an error the source and the target face areas are dissimilar and therefore unsuitable for thin model sweeping.... . nMay be its because i have one part geometry (Fluid Solid together).I have actually tried with Solid186 with 2 through the thickness using edge sizing. But the results (natural frequencies of a free free plate submerged deep in water) contain 60%-100% error compared to the analytical calculation.n