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Frequently Asked Questions (FAQ)
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AnswerIf you want to consider the load cases again, please perform a new RWIND Simulation calculation. If you want to perform the calculation of the existing combinations, please remove the RWIND Simulation load cases from the Wind action before deleting the FE mesh, then the combinations are created again and it is possible to perform the calculation.
AnswerYes, the results can be partially exported. The export function is available for the result tables in the add-on module (as of Window 2.1).Using the example of the steel stress in SLS, it would be possible to only perform the steel stress analysis and then export the table in Window 3.3, for example.When displaying the table in Window 3.3, you can choose between FE mesh points and grid points. The grid can be adjusted as a property of the surface.
AnswerIf the distorted elements are so small that they cannot be detected (see Figure 01), it is recommended to "Display Mesh Quality Annotations." You can find this option in the Display navigator → FE Mesh → FE Mesh Quality. There, you can activate the annotations for the "Warning" and "Failure" elements (see Figure 02). Thus, you can immediately recognize where the location is by using the values. For larger models, it may be helpful to hide the model during the search.
AnswerIn most cases, the problem is that the finite elements of the cover surfaces are very close to each other in the edge area of the cushion when using Bézier surfaces. The FE mesh nodes of the bottom and top surface might be combined then. In principle, there are two approaches:1. Numerical solution of the problem:You can adjust the tolerance for combining FE mesh nodes by using the menu "Tools" → "Regenerate model."2. Geometrical solution of the problem:A more workable solution is to increase the distance between surfaces by using the boundary surfaces as shown in Figure 01.
AnswerIn RFEM, it is possible to search for FE mesh nodes by using the menu "Edit"→ "Find via Number." An existing FE mesh is required, of course.
AnswerIn the case of a layered FE mesh, the same requirements apply as for a contact solid (see the links below this FAQ). If the requirements are not met, the layered FE mesh must be deactivated in the details of the composition (see Figure 02).
AnswerBasically, the surfaces of a model have the FE size that was preset in the general FE mesh settings.You can locally add "FE Mesh Refinements" to a surface model.This has the effect that the general finite element size is kept in the FE mesh settings, but the mesh is locally refined so that more accurate results can be expected from the calculation.In this case, the FE mesh refinement can be performed on nodes, lines, and surfaces. The setting for this can be found in the "Edit" dialog boxes of the node, line, or surface.By using the local FE mesh refinement, it is possible to keep or even increase the general FE mesh size. Thus, it is possible to keep the total number of elements in the model relatively low.
Yes, this is also possible.If you want to edit a graphic in the printout report retroactively, right-click the graphic and click the "Edit" command.Then, you can adjust the configuration in the Display navigator in this graphic where you can clear the "FE Mesh Refinements" checkbox and return to the report by clicking "Return to Printout Report."Thus, the display of the FE mesh refinement in the existing graphics can also be edited.
AnswerThe consideration of curved elements depends on the FE mesh refinement.
An FE element always has straight outer edges.
If you select too rough FE mesh, the result is a very inaccurate display of the curved elements with the straight lines.
If the global setting of the target length of the finite elements is specified with the sufficient accuracy under "Calculation" → "FE Mesh Settings," you can also specify a local FE mesh refinement on the nodes, lines, or surfaces.
AnswerYou can find the setting for this in the Display navigator, under "Model," and "FE Mesh Refinements."If you unselect the checkbox, the symbol for the FE mesh refinement will not be displayed in the structure anymore.
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Wind Simulation & Wind Load Generation
With the stand-alone program RWIND Simulation, wind flows around simple or complex structures can be simulated by means of a digital wind tunnel.
The generated wind loads acting on these objects can be imported to RFEM or RSTAB.
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