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Hello All, I am tring to utilize Virtual Fluid Mass method in order to calculate natural frequencies of fuel tank. However, aacording to results, dry modes are consistent with measured acceleration data, but, wet modes are completely different than test data. Three wet modes, three dry modes are calculated, but wet mode shapes are completely same. Just natural frequency values are different. According to test data, mode shapes of first three mode are completely different. Do you have any idea to sole this problem? Pictures shown below explains my step card. **ELIST 666 is created, because both sides of baffle plates inside of the fuel tank contact with fluid. **ELIST 555 is created, beacuse inner side of the fuel tank contact with fluid. **During shaker tests water is used in order to represent fuel in the tank. Hence, density of water is considered in MFLUID command.