FCP 啥意思？

哈哈哈哈哈。。看来我流体不行🙅 Hydrodynamic Interference: As a massive hull moves through the water, it drags a thick boundary layer of water behind it (the "wake fraction"). The inner propellers sit directly in this turbulent, slow-moving water coming off the belly of the ship, while the outer propellers sit further out in clean, fast-moving water. Because the water flow is drastically different in those two zones, the shapes of the blades had to be modeled differently to capture thrust efficiently