Wandering Spaceship in Deep Space Chapter 90: Turbulence problem
Brother Zhao, with a little interest, asked, "Any good ideas?"
"Not yet, but I just want to understand."
Zhang Yuan didn't dare to say that he wanted to directly challenge this century's problem. The province's averagely invited people to laugh at him... Even in general, Senior Brother Zhao would not laugh at him, but would advise him not to do such a big problem.
soon, two days passed quietly...
The spacecraft has successfully turned, the main engine shuts down suddenly, and it enters a short maintenance state.
The artificial light source from Europa shines on the light sail, causing the entire mothership to slow down slowly.
Optical Path, a great technology.
Because of the existence of this technology, small spacecraft can quickly travel back and forth between the moon and Jupiter without having to carry a large amount of fuel. In the past, at least half of the deadweight of the spacecraft from the moon to Jupiter had to be used for fuel. But now it’s no longer needed. Small spacecraft of hundreds or thousands of tons can reach Jupiter from the moon in just one month. This is a huge improvement.
Zhang Yuan witnessed the process of slowly turning off the main engine.
is like a pot of hot water being poured out. Without enough temperature, the light of the plasma gradually goes out, and the nuclear fusion reaction stops automatically.
From this perspective, the nuclear fusion engine is still 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 Age, only one auxiliary engine and two molten salt piles are left to provide basic electricity.
Molten salt reactor is a kind of nuclear fission value-added reactor that has helped mankind through the long "gray age". The technology has been quite mature, so it is usually used as a backup energy source. As far as the safety of the critical spacecraft is concerned, it is impossible to pin its hopes on a single fusion energy source.
In the next period of time, relevant technicians will also carry out a series of maintenance on the entire engine.
The entire internship career in the engine room is temporarily over...
Zhang Yuan returned to the living quarters a little dazed.
He has a few days of vacation to rest, and then he has to go to work at the nuclear power plant. Anyway, there is nothing too much to do. He plans to stay at home and read the paper.
Well, regarding the turbulence problem, after reading the literature for a few days, he has no idea at all. After all, it is a world-class problem...
At six o'clock in the evening, a small dinner is being held in the "Big Rice Bucket Restaurant" in Area A.
Even if Academician is busy, he will spare a little time at the beginning of each month to ask everyone to have a meal and by the way care about the situation of a few disciples.
"Are you trying to do a turbulence problem?"
"I just want to know..." Zhang Yuan said honestly to his teacher.
Ding Zhaodong smiled, perhaps because he remembered that when he was young and frivolous, he didn't hit this young disciple.
" is indeed a very difficult problem. Many people have studied for more than ten years and cannot write particularly good articles. Time was wasted. If you want to make a fuss in this area, you have to do a good job Prepare mentally."
"If you don't understand anything in mathematics, you can ask Brother Luo Wenhao, or you can ask me directly."
Senior Brother Luo, who is sitting aside, is almost forty years old. He has already graduated with a Ph.D. He is very busy at work and rarely attends such gatherings.
It's the first time Zhang Yuan has seen him.
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 solved two famous Hopf conjectures.
Why are there two? Because Hopf conjecture originally has multiple, one is "S^2XS^2 has no measure of the curvature of the cross section", and the other: "The Euler characteristic numbers of even-dimensional positive curvature manifolds are all positive".
Two conjectures, he could have won two big prizes, but he ended up serving it all by himself.
Zhang Yuan awed in awe and a desire to hug his thigh.
"Brother Luo!"
"Turbulence problem, haha, ambitious! I like to make friends with these ideal young people. I have studied this before."
is also sitting around the wife of Brother Luo, a female mathematician from Orchid in her thirties. She is elegantly dressed and has a special Victorian flavor.
"Hello. Are you classmate Zhang who owns 300 kilograms of gold?"
Zhang Yuan smiled and said, "Ms. Mo, don't be kidding me. In fact, I prefer to have 300 kilograms 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 F area! Would you like me to introduce it for you."
Zhang Yuan couldn't help but feel a little embarrassed, "Girls from Lan, there are already several options in my address book..."
Everyone laughed.
The atmosphere on the dining table was very relaxed. Everyone first talked about personal development in the near end, and then talked about some academic gossip news, which was quite interesting.
Including the mathematical problems that someone proved; condensed matter physics has made a new breakthrough; the famous "Modern Science" journal has been found to have academic corruption, and its influence has plummeted, etc.
"There are more and more people suffering from depression. If they are diagnosed, they will get off the spacecraft on Europa and return to Earth."
"This way..."
""Modern Science" has been temporarily suspended. Several reviewing editors have been investigated. They have submitted manuscripts there before... I didn't expect this to happen."
"Academic corruption may exist everywhere. It is also difficult to avoid completely...mainly rely on the humanistic environment to restrict it."
Zhang Yuan was shocked. The impact of this journal has plummeted. Isn't it related to what happened to him?
~IndoMTL.com~ found that everyone did not focus on him, so they gradually let go.
After the dinner, Zhang Yuan discussed a few words with the newly acquainted Brother Luo.
"The problem of turbulence is mainly in the direction of non-uniform turbulence. After reading the paper, the first thing I thought of was Fourier analysis and related integral transformation. Later I found that it was not right..."
This is his intuitive thought.
"Fourier analysis is too ordinary." Senior Brother Luo smiled: "I thought about it at that time, and later found that the thing is only suitable for uniform turbulence. Even if it is made, the fitting effect will not be very good, nothing too much. Great significance."
Zhang Yuan agreed: "It would be good if it were used as the test questions in the test paper."
Brother Luo patted his head, as if thinking of something, "It is not easy to use pure numbers. If it is a direct numerical calculation, I have seen a good idea, using LES and using non-equilibrium and non-equilibrium respectively. The wall function of equilibrium..."
"The influence on the calculation of the wall parameters under the conditions of three different meshes, and the comparison with the corresponding DNS results... This is a fairly innovative algorithm in the past few years, but in actual application, It’s worse than your father’s algorithm."
Zhang Yuan suddenly flashed, as if grasping something, "Meshing?"
"Then, can we divide the entire observation result into a certain type of community, first decompose the whole big problem into small problems..."
"Society?"
Senior Brother Luo was taken aback, "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 dividing and merging?"
"This...I haven't thought about it yet."