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Found 2 results

  1. Hello All, Hypermesh Version 14 LS-dyna version 4.0. 1>>> I have to mesh a component as shown in figure 1 which consists of Hex and tet elements. I have completed the mesh and and exported to LS-dyna (Figure 3) . While zooming and panning in it, I see some edges as shown in figure 2 below. Is this a major issue? 2>> I have read somewhere that one should not connect Hex and tet mesh directly. It should be done by inserting pyramid elements. I have manually converted the tet elements in contact with the hex elements into pyramid elements. Checked for all connectivity by edges and faces. In hypermesh it seems ok but in LS dyna pyramid elements are not visible. Also the edges from the previous points are still visible. Is there a solution to this. Can this be an version issue? i have attached a .hm file with pyramid elements as reference. Thanks in advance. Bharat 1.1.hm
  2. Hello, Beginner questions. I would like to model an incident electromagnetic beam reflecting/interacting with a specific geometry "Sierpinski Tetrahedron". Achieving a result similar to what is shown below at primarily 2.4Ghz & 5Ghz +- The model in question is rather large as it represents the footprint of a building This is for architectural concept design. (postgraduate research) and i am seeking to build a case for emf attenuation within buildings to provide emf-free zones. This link shows a project carried out within the Altair software suite and closely resembles my desired result for testing different geometries and their effect on building footprint https://insider.altairhyperworks.com/emp-analysis-building/ (is the model for this project available for download and inspection? ( to reverse engineer the process)) And this link/video shows the animation of what I would like to achieve however with a different geometry. Pulse wave? I understand this is a relatively simple procedure within Feko capabilties, however time is a constraint and I would like to request the following: 1- Could someone outline the basic process to achieve this? 1.5- I am seeking to model anechoic chambers as a stand-alone feature as well. (as depicted in the attached image) 2- Is it feasible to model a large scale anechoic chamber and analyze it at the specified frequencies or will RAM requirements be too high? 3- Additionally the building geometry would act as a form of antenna and I would like to check principles of antenna optimisation could be applied on a building scale. (Efficiency of currents generated through the structure etc.. Attached are images of what I would like to achieve and the building geometry at a conceptual stage. Thank you for your time. Roberto Specs: OS: Win 8.1 Cpu: i7 4790k (4.3Ghz) (4 cores) Ram: 16gb Gpu: Nvidia 980m 8gb
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