小弟做压气机叶轮强度校核，计算结果出现了较大的变形量，求助？

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Warning: One or more bodies may be underconstrained and experiencing rigid body motion. Weak springs have been added to attain a solution.  Refer to Troubleshooting in the Help System for more details.        Project>Model>Static Structural>Solution        4/30/2012 12:31:17 PM
Warning: An iterative solver was used for this model.  However, a direct solver may enhance performance.  Consider specifying the use of a direct solver.  Refer to Troubleshooting in the Help System for more details.        Project>Model>Static Structural>Solution        4/30/2012 12:31:19 PM
Warning: The deformation is large compared to the model bounding box.  Verify boundary conditions or consider turning large deflection on.  Refer to Troubleshooting in the Help System for more details.        Project>Model>Static Structural>Solution        4/30/2012 12:31:19 PM
小弟做压气机叶轮强度校核，将fluent的压力载荷作用于叶片，还施加离心力和重力，在结果中出现了大的变形量，为200m，这肯定错了，请各位大侠分析一下原因。小弟先谢了