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In this paper, a simple robust method of the unstructured dynamic mesh for three-dimensional moving and deforming body problems is proposed. The method is developed to avoid the generation of squashed invalid elements by considering each elemental shape. With several three-dimensional applications, it is demonstrated that the present method significantly improves the robustness for problems with large motions of bodies without much penalty in CPU time. The use of the present method for grid movements on curved surface is also discussed. Its capability is demonstrated for the surface grid movement in the tail-fuselage juncture region for the evaluation of the airplane control surfaces.

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