Senior Brother Zhao was slightly interested and asked, "Do you have any good ideas?" ”

"Not yet, I just want to know."

Zhang Yuan did not dare to say that he wanted to directly challenge the problem of the century, and the plainness of the province was ridiculed...... Even in general, Senior Brother Zhao would not laugh at him, but would just advise him not to do such a big problem.

Soon, two days passed quietly......

The ship has successfully turned, and the main engine has been shut down with a bang, and it has entered a brief state of maintenance.

An artificial light source from Europa, shining on the lightsails, slows the entire mothership down.

Optical path, a great technology.

Thanks to this technology, small spacecraft can travel quickly between the Moon and Jupiter without having to carry large amounts of fuel. In the past, spacecraft from the moon to Jupiter had at least half of their payload used for fuel. But now no, a small spacecraft of several hundred or several thousand tons can reach Jupiter from the moon in just a month, which is a huge progress.

Zhang Yuan witnessed the process of the main engine slowly extinguishing.

It's as if a pot of hot water has been extinguished, and without enough temperature, the bright light of the plasma gradually goes out, and the nuclear fusion reaction stops automatically.

From this point of view, the fusion engine is still quite safe. It does not explode and will only automatically extinguish when the reaction conditions are insufficient.

In Earthage's engine room, only one secondary engine and two molten salt piles are left to provide basic electricity.

A molten salt reactor (LR) is a value-added reactor for nuclear fission, which has helped mankind survive the long "gray age", and the technology is already quite mature, so it is usually used as a backup energy source. When it comes to spacecraft safety, it is impossible to pin your hopes on a single fusion energy source.

In the following period, the relevant technicians will also carry out a series of maintenance on the entire engine.

The entire internship in the engine room is over for the time being......

Zhang Yuan returned to the living area a little dazed.

He has a few days off to rest, and then he has to go to work at the nuclear power plant, and there is nothing too big to do anyway, and he is going to stay at home and read his papers.

Well, for the turbulence problem, after reading the literature for a few days, he didn't have any ideas, after all, it is a world-class problem......

At six o'clock in the evening, a small dinner party was being held at the "Big Rice Bucket Restaurant" in Area A.

No matter how busy Academician Ding is, he will take a little time at the beginning of each month to invite everyone to have a meal, and by the way, he will care about the situation of several disciples.

"Are you trying to do turbulence problems?"

"I just want to know about ......," Zhang Yuan said honestly in the face of his teacher.

Ding Zhaodong smiled, perhaps remembering when he was young and frivolous, he didn't hit this young disciple.

"It's really a very difficult question, many people have studied it for more than ten years, but they can't write particularly good articles, and they waste their time in vain. If you want to make a fuss about this, you need to be mentally prepared. ”

"If there is anything you don't understand in mathematics, you can ask Senior Brother Luo Wenhao, or you can ask me directly."

Senior Brother Luo, who was sitting on the side, was almost forty years old, had already graduated with a doctorate, and was usually very busy with work, so he rarely attended such gatherings.

It was the first time Zhang Yuan had seen him.

Senior Brother Luo is a big man who is engaged in research in the field of information. However, his direction was more mathematical, and he was quite famous for his study of positive curvature, solving two famous Hopf conjectures.

Why two? Because there are several Hopf conjectures, one is that "there is no positive section curvature measure on S^2XS^2", and the other is that "the Euler indicative numbers of even-dimensional positive curvature manifolds are positive".

Two conjectures, could have won two jackpots, but he was served by himself.

Zhang Yuan was in awe, and had a desire to hug his thighs.

"Senior Brother Luo!"

"Turbulence problem, haha, ambitious! I love making friends with these aspiring young people. I've looked into this aspect before. ”

There is also the wife of Senior Brother Luo, a female mathematician in her thirties, dressed very elegantly, with a special Victorian flavor.

"Hello. Are you Zhang, who owns 300 kilograms of gold? ”

Zhang Yuan said with a smile, "Ms. Mo, don't be joking, in fact, I prefer to have 300 kilograms of antimatter, which can be used for experiments." ”

"Really? Antimatter is too expensive...... You're very popular among the girls in our F section! Do you want me to introduce it to you? ”

Zhang Yuan couldn't help but feel a little embarrassed, "Girls from Languo, there are already several in my address book that can be selected......"

Everyone laughed.

The atmosphere at the whole table was very relaxed, and everyone first talked about personal development in the near end, and then talked about some academic gossip news, which was quite interesting.

Including what mathematical puzzle so-and-so has proven; There has been a new breakthrough in condensed matter physics; The well-known journal "Modern Science" has plummeted in influence because it has been found to be corrupt academically.

"There are more and more people with depression, and if they are diagnosed, they will get off the ship on Europa and return to Earth."

"That's ......"

"Modern Science has been temporarily suspended, and several reviewers have been censored, and they have submitted articles there before...... I didn't expect this to happen. ”

"Academic corruption can happen everywhere. It's also hard to avoid it completely...... It mainly depends on the human environment to constrain it. ”

Zhang Yuan was shocked, the influence of this journal has plummeted, it can't have anything to do with what happened to him, right?

However, I found that everyone did not focus the discussion on him, so I gradually relaxed.

After the dinner, Zhang Yuan discussed a few words with his newly met Senior Brother Luo.

"The turbulence problem is mainly to do the non-uniform turbulence direction. When I read the paper, the first thing that came to mind was the Fourier analysis and the related integral transformations. Later it turned out that it was not quite right......"

This was his intuitive idea.

"Fourier analysis, too ordinary." Senior Brother Luo smiled: "I also thought about it at the time, but later I found out that that thing is only suitable for uniform turbulence, and even if it is made, the fitting effect will not be very good, and it is not of much significance." ”

Zhang Yuan agreed: "It's good if it is used as a test question in the test paper. ”

Senior Brother Luo patted his head, as if he thought of something, "It's not easy to use pure numbers, if it's a direct numerical calculation, I've seen a good idea, using LES and wall functions using non-equilibrium and equilibrium respectively......"

"The influence of the calculation of each parameter of the wall under three different meshing conditions is compared with the corresponding DNS results...... This is an innovative algorithm in the past few years, but when it comes to practical application, it is a bit worse than your father's algorithm. ”

Zhang Yuan suddenly had a flash of inspiration, as if he had grasped something, "Meshing? ”

"So, can we divide the whole observation into a certain type of community, and first break down the whole big problem into small problems......

"Society?"

Senior Brother Luo was stunned for a moment, "But in the end, you still have to merge the whole problem back, otherwise all the data will be meaningless." What is the method of division and merger? ”

"This ...... I haven't figured it out yet. ”