报错内容：Surface assembly has facets that are not oriented properly with respect to each other. Check the element connectivities for underlying elements 51221 instance fluid1-1 and 65798 instance fluid1-1 (sharing the common edge whose end points are nodes 49233 instance fluid1-1 and 49235 instance fluid1-1), as well as the *surface data cards to ensure that the surface normals are consistent. This message will not be repeated for other facets on this surface with similar problem.

网格的法线方向已经检查过了都是朝外的