Deformation Technique of Unstructured Mesh Deformation to Find the Aerodynamic Characteristics of Bodies at Small Displacements

The technique of the deformation of an unstructured hybrid mesh is presented to simulate the flow around solids performing small movements according to external laws or under the action of aerodynamic forces. The method is based on the use of an auxiliary strand mesh, “tied” to a limited area of the computational mesh. Along each strand, the one dimensional problem of compression and tension is solved in order to ensure a smooth change in the size of the mesh elements. The computational mesh in the area of the boundary layer remains unchanged. The efficiency of the method is demonstrated by solving two-dimensional and three-dimensional problems of modeling the flow around isolated mobile bodies of a simple configuration. The technique is implemented in the NOISEtte software package.