This channel will feature videos on Engineering Design of Mechanical Components and their verification using Open Source Computed Aided Engineering (CAE) Software.
Hope this videos are helpful. You can reach us at contactcae4u@gmail.com
cool ,works like charm . I had multiple failed attempts with non universal package for ubuntu 20 . Glad i cam across this before waste more time and eventually give-up .. A huge thumbs up !!!
In our experience, that was the version which worked well. Others had dependency issues and challenging to resolve. The posted method seems to be easy option
Thanks for the videos. I'm working on similar cases, and this is a very good example, albeit not quite complete. I'm much more familiar with Windows' CFD software than Linux's OpenFOAM. Would you entertain questions if I buy/download the original case from that website? Thanks in advance
Glad to know you liked our work and we are hopeful in providing assistance. Please write to contactcae4u@gmail.com with details on the help you are looking for.
Hi, At this point a structured class is not available. However, link to case file is available in description. It is a good starting point to learn premixed combustion simulation for nominal price. Hope it helps.
Thanks, never could get a simple install on those tar.gz files, now that for me is just as easy as .deb. I'll bookmark this for future reference. thanks again and will be looking to see if you have other tutorials for Salome
@@cae4u125 lol, yeah some basic navigation for salome. I started with Blender and when I used free cad I was able to set the viewer to blender controls. But just basics to start with. salome looks much better than freecad. thanks for the response. If you do have those tutorials I didn't see them.
No, This geometry is not amongst calculix examples. This is self created. Yes, we can plan for a tutorial video. Is there anything specific that you want us to cover?
Also for your thermal simulation, can you do something thermo-mechanical, in an aero-engine application if possible? An assembly with bold preload in the first load step, then mechanical, then thermal loading for example to make something even more practical. I just want to see something in Calculix with coupled (or rather segregated) physics in a few load steps.
Thank you for sharing the details. When you say coupled thermo-mechanical analysis,we hope, you mean steady state conditions while the transient response could be more interesting. Still it would be Computationally large case to accommodate multiple load case of a 3d non-linear model with our current resources, for reasonably good result (This is the reason why we simplify our model) . However, We will try our best.
@@cae4u125 yes steady state will be fine. Any simple geometry good too. Coupled would be nice, but sequentially loaded is probably better actually. Thanks looking forward to it 👍🏽
Not bad. Now do you have any tutorials of how to take this part, import it into gmsh, and then use calculix to do fea and crack propagation on it? Or tutorial on how to use calculix in general? Thanks :)
For crack propagation, Not yet. But are you looking for arbitrary loding? . We are not sure if mixed mode multi axial loading is supported in calculix. Since it is twisted body the induced stress field can be complex even for simple loading.can you Let's know the simulation objective. We can see what best we could do. Further, Our experience is that there is huge dispersion in simulation vs actual test. If you have any validation case, that would be very interesting to take up. For general use of calculix, you can even use FreeCad FEM workbench. You can check our previous video, ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-qz4ZhjQ2q3Y.html. Hope it helps.
@@cae4u125 im just wanting to learn calculix and gmsh outside of freecad for more advanced fea. For cracks, i ask because newest version documentation for chapter 6.29 talks about it is all :) I just started freecad and fea about a week ago. Still learning but now i want to do more like cycles to failure, openfoam, etc etc
Ok. Then we recommend you to watch our previous videos. With those you will understand various aspects of performing FEA and CFD simulations using Calculix and Openfoam. Some of the complementary working files are available at nominal price for practice and experimentation. Life predicting calculations are bit tricky. We are actually planning to do one but only after validation. We hope to do it soon.
Glad to know you are using Calculix. Lately we observed FreeCAD, Salome and Calculix form a powerful combination. It has potential to become industrial quality software. However it still needs extensive Validation.
Implicit analysis. Though,It could be done using explicit dynamics also.Luckily we could trace some files, if you are interested, please drop an email to contactcae4u@gmail.com
I have a question USING OPENFOAM : let's suppose I have a pipe of 2 meters ( for the analysis) and 1-inch internal diameter, 2.5 mm of thickness, made of PVC, inlet speed 5 mts/s, rainolds> 4000, 32 °C., 6 psi. And owing to the turbulent flow there is an FSI (fluids structure interaction), it is possible to know : 1) the displacement depending of frequency at any point of the pipe?, graphics? data? 2) the highest vibrations ( resonance) point depending of the fluid velocity} 3) And a modal analysis) 4) using time dependant?
Using openfoam alone would be cumbersome. It would be worth checking if the coupling is stronge. If so precise coupler would be a good choice. You can couple CFD and FEA software to do the fsi. If the coupling is weak, then you can perform transient flow analysis using openfoam and perform fft to calculate the frequencies. Then seperately perform a modal analysis in FEA software like calculix, and check for the possibility of resonance.
Hum , thank for your ans, I am not sure if i understood: 1) What to you mean by "coupling" "or "coupler", 3) "weak coupling" , and When you said "You can couple CFD and FEA software to do the fsi." you mean 3) OpenFOAM is not far enough to solver this kind of problems, and 4) should I use other software" if so which you recommend me..CALCULIX IS FREE.? , fft calculation can be performed in OPENFOAM TOO? @@cae4u125
Absolutely incredible work! Thank you so much. Do you still prefer to do work this way with Salome now that PrePoMax exists? If you don't know about it you should check it out.
Fantastic vide!!! Could material damping be accounted for like in a viscoelastic solid? To my knowledge viscoelasticity is not possible in calculix? I may be wrong
@@cae4u125 hi I set up all the boundary conditions exactly the same on the video but there is no flame, and I use species transport for this, have you any suggestion?
We hope you could be greatly benefitted by the case files available in gumroad. It can be obtained from the link in description. They are good starting point resource. Please try it out.
Please look into our latest video, compressible supersonic flow over bullet. This is similar case. ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-cebakq7jGQY.html
Very interesting video, have you made different simulations using shell elements with CalculiX? Have you seen some weird results using simmetry boundary conditions? Best regards
We haven't made any other simulation using shell element with symmetry boundary condition. If there is any specific case or its description, we would like to explore. You can reach us at contactcae4u@gmail.com.
@@cae4u125 , as far I remember, using second order elements, and mostly when they are curved as in a vessel, sometimes there are results in the simmetric model that not agree with the full model, or other solver.
We tried with very simple shell and solid model, representing thin shell. If the symmetric BC's (Translation and rotations) are correctly given then the results are comparable otherwise we observed strange contour plot. But the max values appeared comparable though. If there is any sharable test cases still, in which the problem was observed, we can certainly look into it.
Outstanding work. I'd love to see what the preprocessing of this would look like, or if there are any kinds of open source methods to do things like bullet penetration analysis. I've also found quite a few of your other videos and I must say I'm very impressed. If you'd be willing to try figuring out a way to do an assembly with a few parts, attached together with things like RBE3s and 1D elements representing fasteners, that would be swell. Keep it up!
@ZachTheSloth Thanks for your encouraging comments. For Bullet penetration analysis, you check impact.sourceforge.net/index_us.html. we will try to put together a video on analyzing fasteners.
Beautiful Do you recommend me to learn this and use freeCad to make structural analysis (I am interested in pv systems structures)? The normal people use Staad pro, but it is not free.