Chapter 92

Elder martial brother Zhao asked with a trace of interest, "do you have any good ideas?"

"Not yet, just want to know."

Zhang Yuan doesn't dare to say that he wants to directly challenge the problems of this century. The province is plain to be laughed at... Even if generally speaking, elder martial brother Zhao won't laugh at him, but will advise him not to do such a big problem.

Soon, two days passed quietly

The spacecraft has successfully turned, the main engine shut down and entered a short maintenance state.

The artificial light source from Europa shines on the light sail, making the whole Mothership slow down.

Optical path, a great technology.

Because of this technology, small spacecraft can quickly travel between the moon and Jupiter without carrying a lot of fuel. In the past, at least half of the payload of spacecraft from the moon to Jupiter had to be used for fuel. But not now. Small spacecraft of hundreds or thousands of tons can reach Jupiter from the moon in only one month, which is a great progress.

Zhang Yuan witnessed the slow extinction of the main engine.

It's like a pot of hot water being watered out. Without enough temperature, the light of the plasma gradually goes out, and the nuclear fusion reaction stops automatically.

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

In the engine room of the earth times, only one auxiliary engine and two molten salt piles are left to provide basic electric energy.

Molten salt reactor is a nuclear fission value-added reactor, which has helped mankind through the long "grey era". The technology has been quite mature, so it is usually used as a backup energy. For the vital safety of spacecraft, it is impossible to place hope on a single fusion energy.

In the next period of time, relevant technicians will carry out a series of maintenance on the whole engine.

The whole internship career in the engine room is temporarily over

Zhang Yuan returned to the living area a little blankly.

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

Well, after reading the literature for several days, he has no idea about turbulence. After all, it is a world-class problem

At 6 p.m., a small dinner was being held in the "big bucket restaurant" in area A.

Academician Ding, no matter how busy he is, will take some time at the beginning of each month to invite everyone to dinner and care about the situation of several disciples.

"Are you trying to solve the turbulence problem?"

"Just want to know..." facing his teacher, Zhang Yuan said honestly.

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

"It is indeed a very difficult problem. Many people have studied it for more than ten years, but they can't write a particularly good article, wasting their time in vain. If you want to make an article in this area, you should be prepared. "

"If you don't understand anything about mathematics, you can ask senior brother Luo Wenhao or come directly to me."

Elder martial brother Luo sitting on the side is almost 40 years old and has already graduated from the doctor. He is very busy in his usual work and seldom attends such gatherings.

Zhang Yuan saw him for the first time.

Elder martial brother Luo is a great man, engaged in research in the field of information. However, his direction is biased towards mathematics. He is quite famous in the study of positive curvature and solves two famous Hopf conjectures.

Why two? Because there are many Hopf conjectures, one is "there is no positive section curvature measure on S ^ 2xs ^ 2", and the other is "the Euler number of even dimensional positive curvature manifolds is positive".

Two guesses, could have won two awards, but he ended up alone.

Zhang Yuan was respectful and had a desire to hold his thigh.

"Elder martial brother Luo!"

"Turbulence problem, ha ha, have ambition! I like making friends with these young people with ideals best. I've studied this before. "

The wife of elder martial brother Luo, a 30-year-old LAN female mathematician, is also sitting around. She is very elegant and has a special Victorian flavor.

"Hello. Are you classmate Zhang with 300 kilograms of gold? "

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

"Really? The price of antimatter is too expensive... You have a high reputation among the girls in our area f! Shall I introduce you? "

Zhang Yuan couldn't help but feel a little embarrassed, "girls in LAN country, there are several choices in my address book..."

Everyone laughed.

The atmosphere on the whole table was very relaxed. We first talked about personal development in the near future, and then talked about some academic gossip news. It was very interesting.

Including what mathematical problems someone has proved; New breakthroughs have been made in condensed matter physics; The well-known journal modern science has suffered a sharp decline in its influence due to the discovery of academic corruption.

"There are more and more people with depression. If diagnosed, they will get off the spacecraft on Europa and return to earth."

"Well..."

"The publication of modern science has been suspended temporarily. Several reviewers have been checked, and they have submitted contributions there before... I didn't expect this to happen."

"Academic corruption can exist everywhere. It is also difficult to completely avoid... It mainly depends on the human environment. "

Zhang Yuan was surprised. The influence of this journal fell sharply. Won't it have something to do with what happened to him?

However, I found that everyone did not focus on him, so I gradually put my heart down.

After the dinner, Zhang Yuan discussed with his new senior brother Luo.

"The main problem of turbulence is the direction of non-uniform turbulence. After reading the paper, I first thought of Fourier analysis and related integral transformation. Later, I found that it was not quite right... "

This is his intuitive idea.

"Fourier analysis, too ordinary." Elder martial brother Luo said with a smile, "I thought about it at that time. Later, I found that it was only suitable for uniform turbulence. Even if it was done, the fitting effect would not be very good. It didn't make much sense."

Zhang Yuan agreed: "if you take it as the test question in the test paper, it's good."

Elder martial brother Luo patted his head as if he thought of something, "it's not easy to use the pure number method. If it's a direct numerical calculation, I've seen a good idea to use les and the wall functions of non equilibrium and equilibrium respectively..."

"The influence of three different meshing conditions on the calculation of wall parameters and compared with the corresponding DNS results... This is an innovative algorithm in recent years, but it is worse than your father's algorithm in practical application."

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

"Then, can we divide the whole observation results into some kind of community, and first decompose the whole big problem into small problems..."

"Club?"

Elder martial brother Luo was stunned, "but in the end, you have to merge the whole problem, otherwise all the data will be meaningless. What is the method of division and merger? "

"This... I haven't thought about it yet."