### 5.1.5. Mesh Displacement Diffusion Scheme

A number of numerical schemes are available for the solution of the mesh displacement diffusion equation. In many cases the default scheme is appropriate, but in some situations mesh folding can be avoided and improved mesh quality can be obtained by using a different scheme. The expert parameter `meshdisp diffusion scheme` controls which numerical scheme is used. For details, see Discretization Parameters. Setting `meshdisp diffusion scheme` to `3` can be helpful if the mesh folds unexpectedly at sharp corners or if uniform mesh deformation is expected but non-uniform deformation is observed. The figures below show an example of using different mesh displacement diffusion schemes.

Figure 5.1: Original Undeformed Mesh

Figure 5.2: Deformed Mesh with the Default Diffusion Scheme

Figure 5.3: Deformed Mesh with "meshdisp diffusion scheme = 3"

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