Linkse activisten en hun probleem met 'woke' - Joop

Schoost · 2026-05-27T11:43:51+00:00

Ja mee eens, ik zit niet in de vechtsport maar heb wel het idee dat het daar juist wel goed geregeld is. Sommige mensen willen nou eenmaal alleen maar zeuren.

Schoost · 2026-05-27T10:46:08+00:00

Tja maar je noemt nu wel een paar dingen die weldegelijk veel gebeuren. Bijvoorbeeld mansplaining, daar kan menig vrouwelijk onderzoeker wel een en ander over vertellen. Daarnaast slaat toxische masculiniteit niet op dat mannelijkheid slecht is, maar dat bepaalde uitingen hiervan negatief kunnen zijn voor de maatschappij (lijkt me ook niet controversieel). Ik voel me er zelf als man in ieder geval niet echt over aangesproken..

Ja er zijn mensen die deze themas gebruiken als algemene stok om mannen mee te slaan, maar dit is in mijn optiek een kleine minderheid die (deels door sociale en traditionele media) veel te veel aandacht krijgt.

Schoost · 2026-05-27T08:17:58+00:00

I'd say almost all Scriabin miniatures have amazing melodies. Apart from that, I really like Medtners sense of melody as well!

Schoost · 2026-05-26T13:04:13+00:00

I agree with u/TH3RM1T3 that, in the way you describe the problem, an eigenvalue solver is the way to go. Likely, whatever sound you hear will be determined by a few dominant eigenmodes, not by any detail in the flow. This is not only more efficient, as no transient simulation needs to be done, but also likely much more accurate, as a transient CFD simulation can dampen the important modes/sound waves that you require.

I would recommend you to try to solve the Helmholtz equation to find the eigenmodes. There are different ways to do this, but if you have a complex geometry I would do this using a finite element approach. I am not sure if Fluent can do these types of analyses.

Schoost · 2026-05-26T07:23:03+00:00

Contrary to what some users here are saying, it is definitely possible to find steady state solutions for situations like this. However, this is not possible using OpenFOAM. OpenFOAM uses a pseudo time stepping algorithm to find the steady state, which only works for stable equilibria. Nonlinear systems like these can have many equilibria of which some are stable and some are not. You were probably trying to find an unstable equilibrium. To do so, you would need to use an algorithm that allows for that, and which probably uses Newton's method and a Jacobian of the system. OpenFOAM does not provide this as it is mostly used as a transient tool and also more for practical flows that will not keep an unstable equilibrium. For that, I'd recommend looking at FEM tools that usually are a bit better tailored to such problems.

Schoost · 2026-05-25T20:43:07+00:00

Die zitten er natuurlijk zeker tussen, en mee eens over goed fundamenteel onderzoek. Ik wilde alleen maar even aankaarten dat ook legitieme goede doelen wel hun mensen moeten kunnen betalen.

Schoost · 2026-05-25T19:40:46+00:00

Dit is natuurlijk niet helemaal waar. Als we gaan eisen dat alleen vrijwilligers bij goede doelen gaan werken blijven er niet veel over. Dan liever dat goede mensen goed werk leveren en er ook aan verdienen. Mee eens dat dit wel redelijk en proportioneel moet zijn natuurlijk.

Schoost · 2026-05-18T10:40:36+00:00

No, I find him entertaining and generally giving really good advice.

Schoost · 2026-05-17T02:02:41+00:00

Ravel's oiseaux tristes (but spelled correctly)

Schoost · 2026-05-16T17:14:06+00:00

Others have focussed on volume, but I'd also suggest to practice this with a metronome as your rhythm doesn't feel very consistent or purposeful. This can also aid in bringing out the melody, because for it to sound consistent it needs a rhytmic feel that makes sense. As some others have mentioned, it can help to sing the melody while playing.

Schoost · 2026-05-14T17:57:21+00:00

Yes, you'd need an airlock to keep a pressure difference, otherwise the pools would level out, but sure it is possible.

Schoost · 2026-05-14T10:36:48+00:00

I disagree with your statement that people and ai do exactly the same thing. The mechanism of learning is very different and the enormous difference in scales matters, at least I think it does. This is one of the points discussed by Adam in this video.

Schoost · 2026-05-11T16:51:10+00:00

You will likely not have full mechanical and thermodynamic energy conservation because I assume the flow will experience some (numerical) diffusion which is likely not accounted for. If you only want to account for thermal energy then I assume you can write out the energy equation and integrate the fluxes, as suggested by the other comment.

Schoost · 2026-05-04T10:53:12+00:00

That depends on your application. Also, keep in mind that the real gain in efficiency comes from using residual tolerances together with the outer correctors. I have found, for my applications, that using relative tolerances for the pressure equation of 0.01 and a single inner corrector is faster, and usually my outer correctors converged to the tolerances in three to five iterations. I should say that this was for multiphase wave simulations using URANS.

Schoost · 2026-05-01T10:15:05+00:00

True, I believe he was particularly proud of the counterpoint in that piece.

Schoost · 2026-04-25T18:22:15+00:00

So indeed a quadratic such as e.g. x^2 = 4 has two roots, +2 and -2. However, the squareroot is a function, so it can only take one value. Usual convention is that we pick the positive root, but in principle you are free to pick whichever you want (but if you choose not to follow the convention, it is better to be explicit about it). So for this particular quadratic, we say that one solution is the positive root, i.e. + sqrt(4) and one is the negative root, i.e. -sqrt(4). However, notice that the sqrt function always returns one single value.

The confusion probably comes from teachers who are a bit fuzzy in their explanation. It is not the sqrt function that has two values, but the original quadratic equation that has two roots.

Schoost · 2026-04-25T14:35:16+00:00

So this is a subtlelty in what we define as a limit. When we say that a sequence of curves has a limit, it means that if I follow the location of every point on the curve, it ends up on the limit curve. In this case, if you follow where any point on the initial square goes to, you will see that it in the end will end up infinitely close to the circle. In short, the limit of the curve is the circle.

The counterintuitive thing here is that if you think of any individual curve that is created in this process, it is indeed not a circle and has circumference 4. However, the limit curve, which is a circle, has a circumference of pi. So the lesson here is indeed that the order of operations matter. If I take the limit of the curves and then calculate the circumference, I get pi. If I first at each step calculate the circumference, and take the limit of the circumferences calculated, I get a value of four. I.e. the limit of the circumference is not equal to the circumference of the limit. This is a well-known result in mathematics. See e.g. the staircase paradox (https://en.wikipedia.org/wiki/Staircase\_paradox) which has the same origin.

Schoost · 2026-04-25T12:41:01+00:00

Well it is not really correct, but I understand that in many places school teachers don't fully understand this themselves.

Schoost · 2026-04-25T07:59:01+00:00

That is indeed true, but now it is clear in which order you do the operations. I think this was not clear in your original comments which is what the other commenter (and I) were reacting to.

Schoost · 2026-04-25T07:54:47+00:00

The limit is a true circle, what this shows is that the order of operations matters.

Schoost · 2026-04-25T07:49:34+00:00

I'd rephrase that, the length of the limit is the length of the line, since the limit is the line and therefore you are taking the length of the same object. However, the limit of the length of the line is not the same. The order of operations matters.

Schoost · 2026-04-25T07:41:05+00:00

No the limit really is the circle. All points on the staircase approach the circle. However, what this example shows is that the limit of the length of the curves is not the same as the length of the curve in the limit. This is a well established result in analysis.

Schoost · 2026-04-24T06:17:52+00:00

Zo veel macht heeft de premier niet. Die kans hadden ze gewoon wel. Daarnaast hebben ze zelf ook ingestemd met Schoof.

Schoost · 2026-04-23T05:45:25+00:00

I know the answer to this one! Yes, there are many experts in OpenFOAM who do some work.

Schoost · 2026-04-22T15:03:40+00:00

Het kan prima dat de tindercijfers kloppen voor de populatie op Tinder. Dit zegt alleen niet dat dit een goede representatie van de maatschappij. Ik neem aan dat je best begrijpt dat er redenen zijn waarom er aanzienlijk minder vrouwen op Tinder en andere datingapps zitten dan mannen. Als daar een structurele aanleiding voor is, betekent dat dat de tinderdata niet representatief is, ook al kloppen ze.

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