![]() However, ParaView relies on the Visualization Toolkit (VTK) whose data models have historically mainly supported linear elements. On the other hand, ParaView is an efficient open source parallel visualization tool which has been used successfully for post hoc visualization of large scale, unstructured data sets up to several billions of dof. However, Gmsh is in essence a serial tool and is therefore limited to a relatively low number of dof and level of h-refinements. The high-order solution is then interpolated at the new mesh nodes in order to provide an optimal visualization grid. This method relies on recursive h-refinements of the initial mesh, coupled to a projection error estimation. The open source mesh and visualization tool Gmsh provides a general method for the post-processing of high-order finite element fields. However, the lack of visualization tools able to handle a large number of degrees of freedom (dof) has been a major bottleneck for the analysis of high-order finite element solutions generated by massively parallel simulations. ![]() Recently high-order finite element methods initially introduced in the research community such as discontinuous Galerkin (DG) and flux reconstruction (FR) have gained considerable attention in industry, thanks to their high-accuracy on unstructured meshes, their efficiency and scalability.
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