4/12/2023 0 Comments Gmsh boundary layer exampleMesh resulting from second parameters set: Mesh resulting from first parameters set: % # Mesh 2: nsteps = 50, coefficient = 0.8 % # Mesh 1: nsteps = 3, coefficient = 0.8 % The meshes were obtained with the following parameters: % Define global boundary layer parameters We present a fragment of adequate script code and two different meshes illustrate the differences. Number of smoothing steps and smoothing coefficient are passed to the function optionally, as the two last parameters. Smoothing coefficient has a moderate impact on mesh quality, however, changing between a small and big number of smoothing steps can lead to significantly different results). Default parameters are set to 10 smoothing iterations and smoothing coefficient equals 0.9 (should be between 0 and 1). When layers are extruded and wall normal vectors are defined, the function performs automatically Laplace smoothing of directions and lengths of wall normal vectors. This structure shall be passed to the function as the fifth argument. One should define a MATLAB structure with fields (height of the first layer), (height ratio of the following layers) and (total number of layers in mesh). The call to the function requires specification of ids of walls, from which the boundary layers should be extruded and definition of sizing parameters. Geometry with ids of physical lines created in Gmsh is shown below. = extrudeLayers2D(p,e,t,wallIds,layers) In the first case we create boundary layer for a 2-D flow past a circular cylinder. In this tutorial we will show, how to cope with the function, which enables creation of boundary layer mesh for 2-D problems. This tutorial is intended for the full version of the toolbox.
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