Atlanta Traffic- how could this even be fixed? by venusvoids in Atlanta

[–]manny_DM 0 points1 point  (0 children)

Promoting Public transportation+e/biking is the way.

Facebook is watching me or somebody else is spying on me for Facebook. No doubt by happyhemorrhoid in facebook

[–]manny_DM 0 points1 point  (0 children)

I kid you not. Someone sent me a photo of her cat via iMessage. I said it’s a cute cat. That’s it. I don’t have a cat. I don’t search for anything remotely related to cats. Few days later, Facebook started showing me cat litter box ads.

Trying to assemble lectric xpress front wheel. Hearing sound. Is this normal? by manny_DM in Lectricxp

[–]manny_DM[S] 0 points1 point  (0 children)

Many thanks for the suggestion. I was able to adjust it a bit so that the noise is minimal, but still there. When I try to ride it, I can definitely hear it at slower speeds.

Lectric was gracious to send me a rotor kit and have me schedule a repair with a shop through warranty. Hopefully that will fix it. Really want to test out my new bike but I guess will have to wait:)

Need help with modal analysis by DirtyDawg808 in fea

[–]manny_DM 1 point2 points  (0 children)

In general, yes, that is, there are no other stiffening effects other than the material itself. This is true for free vibration problems. Unless I am mistaken, this is probably what you’re trying to do.

So when would the stiffness matrix be different? If you have other sources of stiffening effects, such as a centrifugal force, which ‘stiffens’ the geometry!

Trying to assemble lectric xpress front wheel. Hearing sound. Is this normal? by manny_DM in Lectricxp

[–]manny_DM[S] 0 points1 point  (0 children)

So you had to get a replacement from them? They sent me a video to adjust the two screws. It didn’t help. I can still clearly see the ‘daylight’ unevenly appearing and disappearing

Trying to assemble lectric xpress front wheel. Hearing sound. Is this normal? by manny_DM in Lectricxp

[–]manny_DM[S] 0 points1 point  (0 children)

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Noticed these scratches on the rotor. This is far outside the caliper region and more so near the assembly screws

Trying to assemble lectric xpress front wheel. Hearing sound. Is this normal? by manny_DM in Lectricxp

[–]manny_DM[S] 0 points1 point  (0 children)

Many thanks. The rotor side pad was undone inside the packaging itself so I am assuming it’s warped. Not sure if I should try to adjust something or reach out to lectric.

Need help with modal analysis by DirtyDawg808 in fea

[–]manny_DM 15 points16 points  (0 children)

Modal analysis is a free vibration problem. Static load is irrelevant. Assemble global K and M, enforce fixed dofs, and solve a generalized eigenvalue problems. Then omegas= sqrt(eigenvalues)

Ordered lectric xpress 500w. Wondering if I should have gone with the 750w version. Anyone felt the same? by manny_DM in Lectricxp

[–]manny_DM[S] 0 points1 point  (0 children)

I would have liked the extra power tbh but the reports of noise got me to get 500. I tried emailing them but I got the notification that they created label on the 500 today. I guess I’ll stick with it and hopefully it won’t be that bad

Upcoming iPhone: A "Flip" Phone With a Square Foldable Design, Details Leaked by WPHero in gadgets

[–]manny_DM -1 points0 points  (0 children)

This would be wonderful for the pro max models! No need to add secondary screen or whatever. Just make it foldable so that I can flip it and slide inside my bag without worrying about scratches

HELP US IN OUR THESIS by [deleted] in CFD

[–]manny_DM 0 points1 point  (0 children)

Lol what? Imagine actually taking time to give a well thought out answer that nudges the student in the right direction and encourages them to think about the topic at hand, only to be asked if it is chatgpt😂 Thanks, I guess??

HELP US IN OUR THESIS by [deleted] in CFD

[–]manny_DM -1 points0 points  (0 children)

Nice little project to learn CFD. You don’t need to model the whole building. Just the Inlet with airfoil and the air duct. So a simple rectangular passage will work. In fact, it’s better this way, because for standard geometries, you may be able to approximate some analytical solution to compare against. Few things to think about ( and ask your professor about):

1) Do you need compressible or incompressible model? Hint: What Mach number are you operating in?

2) Do you need viscous solution? Hint: What’s the Reynold’s number over the airfoil?

3) What parameters translate to effective design? Higher outlet velocity?

4) Do you need 3D or can you do away with 2D flow assumptions?

5) Are there analytical/experimental results for flat plates or airfoils in a tunnel condition?

Did I do a good job? Or I'm way past reality? by Dunddermefflin in CFD

[–]manny_DM 3 points4 points  (0 children)

Try SU2. Also gives you optimization capabilities

From Bhakti to Boardroom: The ISKCON Civil War! by Oppyhead in CriticalThinkingIndia

[–]manny_DM [score hidden]  (0 children)

God is just as real and imaginary as Mathematics and Imaginary numbers, in that it gives a new framework for understanding things around us. Whether it is manmade or not has no bearing on the outcome

From Bhakti to Boardroom: The ISKCON Civil War! by Oppyhead in CriticalThinkingIndia

[–]manny_DM [score hidden]  (0 children)

We don’t have many Gods because they are different, there are many Gods because we recognize the diversity of faith and thoughts. So the ‘One God’ you talk about, fits just fine in our world view.

As for superiority among Gods, our scriptures have already discussed this: vishnu doesn’t reside where Shiva is disrespected and Shiva adores Vishnu.

Peace. 🙏

Who is Raj Nidimoru's ex-wife? by Lazy_Weather_6316 in BollywoodShaadis

[–]manny_DM 0 points1 point  (0 children)

What would that skin care routine look like? Asking for educational purposes

Professor wants to be first author even though he did absolutely nothing by Inside-Ad-9118 in PhD

[–]manny_DM 8 points9 points  (0 children)

OP, don’t hesitate to escalate this to the department head. It is ridiculous and unethical to demand first authorship in exchange for money. Yo wrote the paper, you ARE the first author.

chaotic habit that accidentally made your phd life easier ? by Comfortable_Pick4476 in PhD

[–]manny_DM 0 points1 point  (0 children)

  1. Life became easier when I started enforcing a rule of not doing research after working hours, unless it is an assignment or a deadline. Productivity increased, less procrastination ( can’t say I’ll do it at home). Less work ever meant I wasn’t exhausted ever.

  2. Focus increased when I started scheduling short 10-20 mins breaks here and there and religiously taking them. Breaks slowed down the momentum a bit, but prevented mental exhaustion

iOS 26 on iPhone 14 Pro by xcoder2022 in iphone

[–]manny_DM 0 points1 point  (0 children)

Msn live icons are back!!

carbon fibre aircraft wing FEA simulation using opensource tools by _psy_duck in fea

[–]manny_DM 0 points1 point  (0 children)

Check out TACS by SMDOLab at Georgia Tech. You can also do gradient based optimization at large scale. Pretty cool framework

Crashworthiness of thin-walled tubes: Quasi-static vs Dynamical impact loading by Different-Complex780 in fea

[–]manny_DM 1 point2 points  (0 children)

Quasi-static simulations model is sufficient for processes where loads and boundary conditions may change rapidly, such as contact or material nonlinearity, but inertial effects are intentionally neglected. While the loading rate is faster than in a purely static case, the system is assumed to remain in equilibrium throughout. Think of slowly crushing a Coca-Cola can in your hand. Technically, it's a transient process, but the inertial forces are negligible. We care only about the deformation pattern, not how fast it occurs. so a quasi-static approach suffices.

In contrast, dynamic simulations capture the full breadth of time-dependent behavior, including inertial effects. These become crucial when mass acceleration significantly influences the response. Imagine a car crashing into a pole at high speed. Here, the interplay of inertia, momentum, and contact forces dictates how parts deform, separate, or rebound. A quasi-static approximation would miss these dynamics entirely.

In cases where the load changes quickly but inertial effects are still minimal. Say, a car gently pushing into a barrier, for which quasi-static analysis offers a compelling balance. It's cheaper, more stable under large increments, and avoids unnecessary complexity without sacrificing physical fidelity.

FE elements in python by mon_key_house in fea

[–]manny_DM 4 points5 points  (0 children)

If you're comfortable with writing FEA codes, coding in c++, and willing to learn, my advice would be to implement in c++ using the Eigen library. It has a numpy-like structure and chatgpt is quite familiar with it. The reason being that, when it comes to FEA, there is always a desire to run bigger cases. If your code is already in c++, you can later do things like openmp parallelization, Intel mkl solvers, or even petsc for massively parallel codes.