用workbench将fluent得到的数据与模型耦合得到错误

为什么我用workbench将fluent得到的数据与模型进行耦合出现Mechanical Mapped Forces for  Mechanical Surface 和CFD Computed Forces from CFD  Results的力完全不一样，而且方向还是不同的，请教大家！CFD Computed Forces from CFD Results File  C:UserscindyAppDataLocalTempWB_CINDY-PC_4588_2unsaved_project_filesdp0SYSMECHSolution  1zz-zjm-1357bu-2-00071.dat.gz  X-component = 155.28 N  Y-component = 34.769 N  Z-component = -182.87 NMechanical  Mapped Forces for Mechanical Surface File  C:UserscindyAppDataLocalTempWB_CINDY-PC_4588_2unsaved_project_filesdp0SYSMECHImport_ANSYS_386.cdb  X-component = -1026.2 N  Y-component = -1006.2 N  Z-component = -319.27 N16% of Mechanical nodes were mapped to the CFD surface, remaining nodes mapped to closest edge or node. 为什么会出现这种情况