Elmer Discussion Forum

thank yoou Peter for checking out my post. the "Air" body that you see in the sif, is a mistake; after I selected the new geometry for this similation (the geometry without air body), elmer has assgined name of "air" to the "wall", and I missed/forgot to rename it back ...

Hi, This is somehow connected to the other post that I sent; I hope that I am not spamming, since the topic was specialized to radiation, I thought it people might benefit people who are learning or might have the similar questions, if separate these two posts/questions. link to my past question: ht...

Hello everyone, I would be thankful if you can take a look at my simulation: I am trying to simulate a hot object in a room and see its effects. I'm relatively new to Elmer, at first I tried to break down my simulation to learn different aspects separately, but now, when I am trying to combine every...

Hi I am NO expert ! and guidance of kevin, peter and others for sure prevail over mine. Going through Elmer and Linux for sure is fundamentally more stable and better; but I felt you might be like me, a person who is migrating from Windows based software and used to other commercially available soft...

1. Thanks for pointing out the mesh issue ! My first goal was to have 3 distinguished parts, so I can give them different materials. I wonder how I can have 3 parts, but with shared boundaries!??!?!..... I use FreeCAD and Gmsh and my go-to option was the "compound function" in FC... now I ...

Hello again, First of all thank you for your patient, I know I have asked so many basic questions; I hope you can guide me as before: I am simulating a hot object, inside a box; the bot T is fixed and constant, but the air T and the object T can change. My goal is to simulate and calculate the T and...

Hi To original questions 1) yes 2) Dirichlet fixes the temperature and overruns everything else. Open boundary means that view factors will not be normalized to 2Pi. As they sum of to less the rest is assumed to be idealized radiation. 3) No. Heat gap is intended to jumps. All PDEs are by default c...

Hi I think one issue here is that most of us use Elmer almost exclusively on Linux. This is also the natural platform for supercomputing so if you want to got to larger problems things will be almost the same. The parallel computing of Elmer has been touched in webinar series, the slides are here h...

Do not put "emissivity" for air. It does not make any sense. Air cannot have emissivity since it cannot have a surface. The radiating material should have emissivity defined. The direction of the normal vector will be set from the material that has emissivity defined outwards. For this re...

Thank you again ! Just remembered another question: Assuming, my understanding in last post is correct: "Air, is usually considered as incompressible in low speeds, but if I want to apply a compressibility model, then the "thermal" model is the correct choice" :?: Should I use th...