From failed candidate to chief scientist

Chapter 145 Turbulence
"Lin Mo, what are you looking at?"

"The Kalman-Haworth equation?"

"Why are you suddenly studying this?"

Shan Gang looked at Lin Mo strangely.

"Isn't this the application of studying the NS equation? The KH equation is an important equation for solving turbulence problems and is also a simplified NS equation. I want to focus the next research on this aspect."

"What? Study the KH equation? However, although the KH equation simplifies the NS equation, it is not half simpler than the NS equation. Moreover, the number of unknowns in the KH equation is more than the number of equations. There is no way to solve it."

"Well, that's a question, but if all research is so simple, what's the point of our research? Aren't we just going to study the unknown and seemingly impossible research?"

"But……"

"Gangzi, don't you think this turbulence is interesting? I remember that you studied fluids in the physics department before. You should be very interested in this."

"Yes, it is quite interesting, but it is also a deep pit. This is not something that can be studied in a short time. It is too complicated. There are many theoretical assumptions that make the study of turbulence have no practical significance at all. .”

Shan Gang had obviously studied it, and he still had a slightly frightened expression on his face.

"Oh? It seems you have studied it. Come on, tell me about it."

Lin Mo suddenly became interested.

"This one……"

Shan Gang was a little embarrassed. She really didn't want to recall those bitter days of studying turbulence.

"Quick, come and talk to me. I have asked Teacher Zhang to initiate a project on this. This is our next research task."

"What? The project has been approved?"

"The project about AdS/CFT issues..."

"Let's study together. Aren't we always working on multiple projects at the same time?"

"But, the difficulty of these two projects..."

Shan Gang scratched his head a little.

The AdS/CFT problem is about string theory, which is an extremely complex and profound problem in itself. Many laboratories study this alone, but it is difficult to come up with results. But now Lin Mo has another more difficult turbulence problem, which Are you going to let people live?
Lin Mo didn't have any worries in this regard. Who told him to hang on the wall?
The Mathematics Research Center was very quiet at this time, because only Lin Mo and Shan Gang were left.

Marina has been staying here for more than a month. While the research on NS equations has come to an end for the time being, she has some things to deal with back to Zurich. She still has her family there and her teaching job at the school. She is the only one in the mathematics research center. As a part-time job, she will not stay in Dongshan forever.

Jiang Fanjun returned to the Imperial Capital to handle relevant files, procedures, and some trivial matters in life. Although Jiang Fanjun has confirmed to join Dongshan University, there are still many things in the Imperial Capital that he needs to finish, including the graduate students he taught at Shuimu University. Arrangements are also required.

Lin Mo originally wanted to ask Jiang Fanjun to bring his graduate students with him, as the center needed talents in computational mathematics. After all, Jiang Fanjun was old, and it was really difficult for him to ask him to figure out algorithms and write code by himself.

Regardless of whether Lin Mo thought about it or not, he felt that it was not appropriate. From Shuimu University, a top university in the country, to Dongshan University, a second-tier university, even an individual would know how to choose.In order not to cause trouble to Jiang Fanjun, Lin Mo pushed back the idea.

Zhao Bo also left, and he went back to Harvard. He was going to complete his graduation defense with the paper "Data Analysis Based on Multiple Comparisons of a Large Volume of Data" that was about to be published in the Journal of Mathematics. If he still If it didn't work, he decided to have a showdown with his mentor and fire his mentor. Now he has the confidence.

Zhang Qihua was busy with the project's response. He was busy completing previous projects, writing project completion reports, settling funds, applying for new projects, and wrangling with the school's Science and Technology Department and Finance Department.

Tian Fangyi was so busy that he could not see anyone. He was not only the director of the Mathematics Research Center, but also the director of the Department of Mathematics. All kinds of administrative work in the department were waiting for him to make decisions, leaving him very busy.

As a result, only Lin Mo and Shan Gang were left in the mathematics research center on this entire floor, which seemed extraordinarily empty and quiet.

This state will continue for some time in the future.

Everything seems to be back to how it was before.

Lin Mo didn't care about this, but continued to devote himself to the research at hand.

"Come on, Gangzi, tell me about this turbulence."

"That, all right."

Shan Gang started to talk to Lin Mo with some reluctance.

Turbulent flow is a state of flow in a fluid.

When the flow velocity of the fluid is very small, the fluid flows in layers without mixing, which is called laminar flow, also known as steady flow or sheet flow.

When the flow speed gradually increases, the streamlines of the fluid begin to oscillate in a wavy manner, and the frequency and amplitude of the oscillation increase with the increase of the flow speed. This flow condition is called transitional flow.

When the flow velocity increases to a large level, the streamlines are no longer clearly discernible, and there are many small vortices in the flow field. The laminar flow is destroyed, and there is not only sliding but also mixing between adjacent flow layers.At this time, the fluid moves irregularly and has a velocity component perpendicular to the axis of the flow tube. This movement is called turbulence, also known as turbulence, turbulence or turbulence.

Turbulence is called "the last mystery of classical physics" because the principles and internal mechanisms of turbulence have always been important issues that have puzzled scientists.To put it simply, there is no answer to the question of how advection gradually disintegrates into turbulence and how the shape of the system that has generated turbulence evolves.

Turbulent flow is a large Reynolds number, nonlinear, three-dimensional unsteady flow.

It has the characteristics of randomness, diffusion, dissipation, rotation, memory characteristics and intermittent phenomena, and its movement is extremely irregular.

Turbulence is related to the changes in everything in the universe, ranging from the movement of particles, to the flight of airplanes, to the flow of rivers, the rise of smoke, to the movement of celestial bodies. For example, the earth's atmosphere is a huge turbulent system, and even the principle of black holes. , all related to turbulence.

If the problem of turbulence can be solved, many problems can be solved. Therefore, the research on turbulence has never stopped, and many scientists are devoted to it, trying to unlock its secrets.

Some people even predict that the turbulence problem is a Nobel-level problem, and whoever can solve it will win the Nobel Prize in Physics.

To this end, countless scientists have worked one after another. More than 200 years have passed, and this problem that has troubled countless scientists has still not seen any breakthrough progress. No one can give an answer to solve this problem that has spanned more than two centuries.

Following Shan Gang's introduction, Lin Mo gradually fell into deep thought.

(End of this chapter)