The streamwise method is applicable to extrusion and coextrusion models only. It assumes a regularity of the domain, which can be seen as a series of mesh lines emitted from the extrudate section. Ansys Polydata will therefore ask you for inlet and outlet sections for the remeshing region.

Along these mesh lines, which can be on the boundary, on the interface between coextruded fluids, or inside the domain, the streamwise method aligns the mesh with the local velocity vector. Ansys Polyflow applies the line kinematic condition on all mesh lines, both interior and on the boundary. In the direction of extrusion, the position is kept constant.

This method is an alternative to Optimesh for extrusion, and is well adapted to situations where large isotropic deformations occur. A typical example is 3D fiber spinning with large drawdown ratios. The streamwise method is applicable to both direct and inverse extrusion.