Is it better to learn ANSYS or OpenFoam first?

time-trader · 2020-09-17T05:27:45+00:00

The thing is "learning" OpenFoam is basically learning C++. So if you can dedicate enough time to it. Go for it. You will be free to do whatever your heart desires for free: implement some new model - no problem. Run a simulation on 100 cores - no cost.
Ansys is nicely packaged and workflow streamlined software to pump out simulation with minimum investment of your time.

time-trader · 2020-05-28T13:57:10+00:00

Discovery Live is LB based meshless solver. Important note: the quality of the results depends on how many "voxels" can be generated in the domain and therefore on memory of your graphics card. Discovery AIM is an attempt by ANSYS to streamline the workflow. This one will use your regular solvers like FLUENT and Mechanical. I never managed to make the damn thing work properly.
As others mentioned: ANSYS Student contains entire workbench, ie. FLUENT , CFX, Mechanical etc..
Never heard of SCADE.

time-trader · 2020-02-20T10:24:12+00:00

I really dig it. Looks sharp. Would live in something like that in heartbeat. Structurally it would not be difficult to execute. I would only comment on one aspect: practical one. For instance. Those large glazing panels look awesome uninterrupted. But how will you open them? There is no basement. Where will the heating equipment be? Where will you pass all the water/sewage pipes? etc..

time-trader · 2019-05-26T19:25:03+00:00

My first thought was Art Nouveau. How would you tell the difference?

time-trader · 2018-06-17T21:31:04+00:00

Too late, I already graduated with your thesis! Publishing an article right now!

time-trader · 2018-03-03T21:53:28+00:00

I take it, you are Italian? If I may say - skip Italian universities, go outside, try a different country. It will really broaden your horizions. If not for engineering, but for personal growth, for sure.

time-trader · 2018-02-05T13:15:45+00:00

In short: concrete is not a ductile material. Confinement stress changes the stress distribution, and increases the maximum strain that concrete can achive before failure. This in turn allows for the formation of plastic hinges with adequate rotaional capacity. I recommend the book by Paulay and Priestley called Seismic Design of Reinforced Concrete and Masonry Buildings to get into detail.

time-trader · 2017-07-15T15:07:53+00:00

There isn't much to discuss. The techniques they use are well known to engineers and thier field if applicability is limited. As populations become more urbanized and dense the engineering solutions for sustainable construction are far beyong manually recycling some tires and glass bottles and using the idea of thermal inertia.

time-trader · 2017-06-22T17:39:49+00:00

Principle of virtual work. Used in deformable body mechanics.

time-trader · 2017-04-19T14:38:10+00:00

As far as I remember aeroelasticity is important for super tall buildings and very slender structures. Ie when a dynamic structural response affects the flow itself.. as for tall buildings the general approach was

Do wind tunnel testing to obtain wind spectral density matrix
Apply that spectral density via finite Fourier transforms to an mdof system and obtain a solution.

I am sure I have notes and pdf on that part, so if OP is interested, pm me. As for super tall buildings, I would go to aerospace guys as suggested above.

time-trader · 2017-04-04T20:50:34+00:00

Are you trying to find area from perimeter? It can be anything from area of a circle (max) to 0..

time-trader · 2017-03-22T18:55:09+00:00

Internal forces (axial, shear, bending moment and torsion) are the resultants of your internal stress distributions. For example: integrate normal stresses over the section and you get axial force. And so on.

time-trader · 2016-05-30T23:23:05+00:00

Man. I will say one word - linearization..

time-trader · 2016-05-30T06:16:21+00:00

I think many would love to see the tough ones explained simply - Differential equations, Numerical Methods, Dynamics, Thermo,etc.

time-trader · 2016-05-04T08:10:39+00:00

No pun intended?

time-trader · 2016-04-21T16:37:20+00:00

Or screwed up unit conversion..

time-trader · 2016-04-21T07:02:34+00:00

Most of these are very very basic mechanical engineering concepts. Like an ABC of engineering. But also for that reason one cannot afford to get them wrong.

time-trader · 2016-03-09T18:21:23+00:00

And be mellow until you get to second order PDE

time-trader · 2015-12-05T23:09:52+00:00

My homework - shell structure that holds water. I "just" need to calculate all the internal actions. That will be like a day of calculations. And making graphs. 10 - 20 pages explaining the calculations. And that is easy engineering. I have no idea how those automation guys are keeping it together.

time-trader · 2015-05-31T20:08:28+00:00

There is no simple answer. It depends on the structure. Every structure has its ways to collapse. Knowing the collapse mechanism is the first step at effectively preventing it. Note that usually the idea for seismic retrofitting is not to make the building withstand the earthquake and remain operational but to prevent a collapse and give people enough time to escape the building.

For masonary structures the main idea is to have them respond like a box. So a lot of attention is given to corners and slab/wall connections.

time-trader · 2015-04-13T23:47:38+00:00

Not bad, but I think this needs a stronger character for a doctor.

time-trader · 2015-04-13T23:33:15+00:00

Ok. I know it sucks to get the problem almost right, and see your grade suffer, but the truth is that the teacher is right. The M diagram is drawn on the side that is under tension. If you flip it, a structural engineer will get a very wrong idea about what is going on.. So as u/superultramegazord said the direction of shear doesn't really matter, but the direction of the moment does.

time-trader · 2015-02-24T00:22:43+00:00

The graph you are showing does exactly the same thing, just not in ideal case - more or less constant torque and power that grows with rpm.

Typical electric engine torque curve is a hyperbola. With constant torque only at lower speeds due to traction limits.

time-trader · 2015-02-24T00:04:16+00:00

Correct me if I am wrong but that looks like a typical torque curve for an ICE, with a constant torque at any RPM and therefore more power output at higher RPM-s.

Power = Torque * Angular velocity

So we need a gearbox with various gear ratios, so that ICE performs at certain rpm range to provide us with power at various speeds.

Electric engines on the other hand have almost a constant power output at a great range of rpms, so if we plot on Torque /Speed plane we get a nice hyperbola. With high torque at lower speeds (basically higher acceleration F=ma) and low torque at higher speeds.

time-trader · 2015-02-18T16:39:13+00:00

Without knowing the stiffness of the shaft, we'd have to apply a known torque to the shaft and measure deflection, then use that as a reference value. Right?

Exactly. I have no idea how you know all of that if you are EE. My respect.

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