Learning Forum

[julius.langenhorst]

Hello,nLet's say I have a rectangular shell cuboid with rosettes on three sides and a OSS on top. nIf I want to run a parameter study on this geometry, how do I know that my rosettes and OSS stay at their assigned position while the geometry changes, assuming that the input parameters define my geometry?nAlso, how can I select all elements in a specific area of the geometry, for example on the side panels?nRegards,nwaldmeistersweinn

[Rameez_ul_Haq]

It depends on what kind of rossette you are using. Assume you are using a edge wise rossette, and you used three tangential lines to define the edge that is supposed to be used, then you try to modify the geometry. This modification can cause a change in the number of lines you defined to be used as the edge in edge rosette. Sometimes, a change in the geometry can cause that line to be completely gone and you would then encounter an error depicting that 'there is no edge defined' or something like this. If you instead used a parallel, then the initial input orientation for the parallel will be used through out the parametric analysis and will not change depending on geometry; however the point (or origin) which you picked on the geometry to define the parallel rossette can translate depending on the change on geometry, or maybe not. i.e. the location of point might remain constant, or you might even need to input the location of point to define the parallel rossette again for each of the parametric analysis. Same thing applies to all of the rossette techniques like radial, cyclinderical or spherical. A study on this would be an efficient way to check what actually happens to the rosette appointed location and directions. And by study, I mean that after the parametric analysis is complete, select a design point as current, then go back to the ACP Pre to see what happens to the rossette origin and direction.nAs far as the OSS is concerned, the OSS location might also or not move depending on the change in geometry. However, the direction of ply layup will not change since they depend on the surface normals and the mesh elements normal. If you didn't change the surface normals in the design moduler, then I reckon the direction of ply layup will remain the same.nFor the last question which you asked, select the area in the 'Model', create a named selection and then it would appear as a separate region under 'Elements' in the ACP Pre.n

[julius.langenhorst]

Thank you for your answer !nI'm using only parallel rosettes but since my geometry is only getting scaled I might use edge-wise rosettes. That might reduce workload in case a rosette wanders of during the study.nAs for my second question, the selection would stay the same during the parameter study, wouldn't it? How would I access, for example, the thickness of each element of this section?nRegards,nwaldmeistersweinn

[Rameez_ul_Haq]

If you are just scaling the model in the parametric study, then i think the selection would remain the same. However, if you are making some modifications to the geometry by yourself (which you cannot since that would mean that you cannot do the parametric study), then that named selection can get lost and then you might have to rename it. nAs far as the scaled geometry is concerned, then there is no rotation of the geometry. Hence you can also directly use the parallel rossette as well. However, if there is a rotation in the geometry, then the fiber directions will be different on each of the design point. This problem can easily be shunned if edge wise rossette is used.nUse a 'sampling tool' in ACP Pre to find out the thickness of the location where you want to find the thickness. Make that the output under the parametric study. n(Please also click on 'Yes' if this answered your question).n

[julius.langenhorst]

Thanks again for you answer. When I create a sampling point I am not able to select it as a parameter. I create a parameter in the parameter tab and click in the 'Object' field and then on my sampling point but nothing happens, the field only turns red.nAlso, what do I need to do to select 'String' as type? n

[Rameez_ul_Haq]

Yeah I just realised that thing as well. Maybe it is not possible to create a parametric study on the sampling point (more specifically, on its thickness). Maybe checking the ANSYS Help might be fruitful.nFor the string, the variable should be the material, where you essentially have to input the variable name as a string.n