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I recommend these are changed to, respectively, level colors, to give hard edges to the contours and switching nodal stress averaging off. The default settings for stress plots in the post-processor show a continuous color rendering and use nodal averaging of stresses. The default output quantities are deformation and von Mises stresses. Once the analysis is complete, the results are loaded into the FEMAP database and the post-processing toolbar becomes live. The ability to experiment and quantify the mesh quality helps greatly in the search for the “perfect mesh.” FEMAP allows for a large number of undo and redo operations, so it is easy to step backward and forward to make your pick of the best mesh. One or two configurations are rejected because of “rogue” elements appearing. The random nature of the meshing operation is clearly shown. The plots show the mesh on the inside face of the fitting, another critical region. The increasing number of elements runs from top left to bottom right in the figure. 10 shows a montage of mesh quality plots as I step through a range of meshes with increasing fidelity. When using the toolbox, as the mesh is updated, the element quality also updates. I can then cycle through and increment that element count automatically. I have set up interactive meshing action using edge control, adding one element to each edge when I run the tool. This collection of meshing methods has been developed over the last few years and includes an interactive meshing capability.
#Siemens nx nastran manual
The objective is to selectively increase the number of elements along key edge curves to improve the mesh within the body.Īn alternative to the manual mesh updating strategy shown so far is to use the FEMAP meshing toolbox. The default sizes tend to be very conservative and result in a coarse mesh that can be viewed as being adequate for a Normal Modes analysis but usually unacceptable for a strength analysis. Using this default results in a similar mesh to that created with the default element size. There is a default number of elements applied to each edge curve. The number of elements along each edge curve is used as a guide. The next level controls the size of elements within a solid body using the body edge curves. The top level is the default element size, which is based on overall geometry dimensions.
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There are a hierarchy of meshing controls within FEMAP. This is a typical starting point in any meshing task, and I use the FEMAP tools to improve the situation. We are anticipating high stress concentrations around here, and there are not enough elements to produce a good result.