Deep Space Fleet

John continued: "Your father's algorithm is indeed the most outstanding work of mankind, but it is far from powerful enough. Therefore, we cannot make the nuclear fusion device smaller, and each reactor is like a mountain It's just too rough. "

Zhang Zhangyuan looked at these turbulences. Some were bright, some were dim, and others were spinning and lost in thought.

Whether he is convinced or not, John's complaint is indeed correct.

He had a small ambition in his heart, like a seed taking root.

"A question that my father did, maybe ... I can too ?!"

Turbulence, the last mountain in classical physics. About 400 years ago, the Navier-Stokes equation, also known as the N-S equation, had a theoretical description of the physics of fluids. This equation is generally difficult to find an accurate solution, so scientists usually use some simplified theoretical models or resort to numerical simulation methods to predict the motion of fluids.

But using a simplified model to simulate plasma turbulence is too imprecise. If these plasmas are not constrained, they will cause huge damage to the fusion engine.

The flourishing development of informatics has caused some looseness in the turbulence problem, but it is only just some looseness, which can be simulated more accurately, but cannot really understand its true essence.

John John sighed: "We may never find a mathematically accurate solution to the turbulence problem, maybe it is completely hidden in a more microscopic probability superposition state, and with our ability, we don't know it at all."

John Wilson is a typical representative of pessimism.

He believes that the upper limit of human technology is likely to be as it is now, and human IQ can only move around in such a small circle.

Although there are still some details to be polished, it is impossible to achieve qualitative change.

So, this group of pessimistic scientists wants to board the spacecraft and wants to see the world after three thousand years.

说法 This statement is not without reason. A turbulence problem has not been completely solved for four hundred years.

In advanced physics, in addition to the condensed state still maintaining a vigorous vitality, everything else has gradually declined. High-energy physics is plagued by the "energy-level desert". Other disciplines, such as chemistry and semiconductors, use some approximate theories. The most important thing is that these approximate theories can indeed solve some problems.

As for mathematics, it is slowly going downhill.

Riemann conjecture, it can stand for 400 years; Goldbach conjecture, 600 years.

The "Unification of Mathematics" plan is still only a framework, and there are still tens of billions of light years to complete.

The New Civilization School believes that the current 23rd century, plus the 24th and 25th centuries, is likely to be the last golden age of humankind. Then, the overall human intelligence cannot continue to develop.

Once the development of science and technology stagnates, human civilization is likely to have historical recurrences like the ancient Xia Kingdom. In academic terms, that is, falling into the "tradition of mediocrity", it is difficult to make historic great progress.

Zhang Yuan actually agrees with some of the views of the New Civilization School, but he is neither pessimistic nor optimistic about this issue.

其实 He doesn't really believe that human beings will be stupid enough to fall into foreseeable traps. It is also difficult to imagine what the future world will be like. Maybe there will be some technology that transforms intelligence.

In addition, the direction he is engaged in is more biased towards engineering and technology. There is still a big difference between technology and science. There is indeed a lot of room for improvement in human application technology.

"Zhang, you are too optimistic."

John shrugged his shoulders and said helplessly: "In history, there are many phenomena, such as Latin Americanization, middle-income income traps, etc. Even if some countries know it well, they still cannot overcome it because of many things in a country, Not leaders can realize it. It depends on the strength of the whole. "

但 "But human collective power is not as powerful as you think."

"Yeah, you are right." Zhang Yuan said: "But we must always be optimistic, aren't we? Pessimism cannot solve any problem."

I bid farewell to this sentimental Brother John, Zhang Yuan returned to his laboratory seat and began to read the literature.

I accidentally turned to a book.

100,000 Unsolved Mysteries ...

From astronomy to geography, from mathematics to physics, there are too many problems that cannot be solved. For example, the "3x + 1" conjecture, the good ending problem, the Gauss circle problem, the Erdos-Graham ternary problem ... any one, the difficulty is comparable to Li guess.

I do n’t know why. Looking at the numerous problems, Zhang Yuan always had a slight anger in his heart.

Maybe, as a researcher, I can't thoroughly penetrate the natural instincts of anger.

Zhang Yuan secretly squeezed his fist.

At this moment, he finally made up his mind to solve a world-renowned problem.

I do not care about gains and losses, but just follow my own heart.

"Turbulence issues!"

"Try it!"

It takes a lot of courage.

It may take a lot of time, nothing can be achieved, and the sunk cost is huge. Only he, a young man like him, can move forward with bravery.

After His Majesty made up his mind, Zhang Yuan exhaled a long breath, slowly sinking his mind.

From a purely mathematical standpoint, there is basically little possibility.

远 Zhang Yuan doesn't feel his current strength and can write a more accurate and effective equation than the N-S equation.

或许 "Maybe ~ www.readwn.com ~ can create some informatics methods to solve this problem."

The first method is the famous "wavelet transform spectral method" used by his father, which is also the best algorithm in current engineering applications. It successfully solves the problem of multi-scale turbulence simulation of the internal flow of the engine in both time and space.

In essence, it refers to the transmission process of signals in neurons to describe the burst mechanism of turbulence in pipes.

The second method is a method of direct numerical solution.

解 Simulation of isotropic turbulence in a three-dimensional periodic cube by solving the "N-S equation" of incompressible fluids. However, this method requires high computing power and is suitable for calculating simple turbulent motions with low Reynolds numbers, such as channel or tube turbulence.

Of course, there are the third "RNGκ-ε model", the fourth "-Allmaras turbulence model", the fifth method "internal and external iteration methods", and so on.

The creative power of people is infinite, but there are only a few algorithms that are really meaningful and useful.

"You're looking at turbulence? This thing is not generally complicated!"

Zhao Qingfeng glanced at his screen and said with interest: "I have also studied this content, the core reason is that the problem itself is too difficult, strongly nonlinear, infinite-dimensional systems, chaotic systems. These three difficulties are currently There are no very good mathematical tools. "

所以 "So if you want to do it, I have no particularly good advice for you."

"I know, just look at it casually." Zhang Yuan said quickly.

Brother Zhao smiled a little, feeling good about being young. If it was him, he would definitely be far from this kind of problem.

However, he didn't care too much. There are many things. As long as he understands, he will retreat.