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Frequently Asked Questions (FAQ)
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AnswerIf distorted elements are so small that they cannot be detected (see Figure 01), it is recommended to display the '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, using the values, you can immediately recognize where the location is. 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 using the menu 'Edit'→ 'Find by Number'. An existing FE mesh is of course a prerequisite.
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.
AnswerIt is not possible to give a general answer to this question as it depends on the structural system. There are several divisions to be considered in RFEM.
1. Member Divisions for Result TablesThe member divisions for result values can be created via "Insert" → "Model Data" → "Member Divisions." This division ensures that the internal forces of members can also be displayed at intermediate points in the RFEM results tables, for example. The graphical result display remains unchanged.
2. Member DivisionsThe divisions for the graphical result diagram and the determination of the extreme value can be displayed and controlled in the FE mesh settings (see Figure 01).For cable, foundation, and tapered members or members with plastic properties, you can specify the number of internal divisions. They lead to a real division of the member by intermediate nodes. However, if a member is arranged on the boundary line of a surface or if the definition line has an FE mesh refinement, the specification has no effect.The option to activate member divisions for large deformation or post-critical analysis allows you to also divide also beams for the calculation according to the large deformation analysis by intermediate nodes, so that these members are calculated with higher accuracy. The number of member divisions is taken from the text box above.If using the division even for straight members, which are not integrated into surfaces, FE nodes are generated on all free members and considered for calculations according to the linear static and the second-order analysis. The FE length is either determined by the global target length lFE in the General section of the dialog box, or entered manually.The option to use division for members with nodes lying on them creates FE nodes on those locations of the member where the end nodes of other members are lying, without having any connection between these members.
AnswerBy using the FE mesh refinement, the program allows you to create a mapped FE mesh. The automatic FE mesh generator can thus be controlled to a certain extent. However, a specified mesh geometry cannot be set.
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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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