From all-round academic master to chief scientist

"why is that?"

Even Lin Xiao was quite surprised when he heard the news.

After the magnetic fluid channel has been running for an hour, the water flow will be turbulent?

Ma Weimin shook his head: "I don't know either, so I'm worrying about it."

"During the DNS (direct numerical simulation) process, I didn't realize that this would happen at all, but it turned out that this happened during the actual process."

Shu Qingzong asked: "Is it all an hour?"

"It's not all an hour. Some are an hour, and some are more than an hour. It can even be two hours, three hours, or six hours. Basically, it all happens after an hour." Ma Weimin said .

"Have you never discovered this before? I remember that there was a team in China that made a model and studied it?" At this time, Director Ma said, the funding approval for these experiments is also related to his department, so he has also heard about it : "I remember that it has been running for many days? There is no problem."

Ma Weimin said: "Their pool is a self-built pool, and it is not a submarine, it is just a boat. My model tests are basically conducted in large experimental pools, which completely simulate the marine environment. Water pressure, water flow, etc. Basically they are different.”

"That's right." Ma Gaodian nodded, indicating that he understood.

Then he didn't say much more. After all, in front of these three professors, although he still had a doctorate degree, in total, he really didn't read as many books as these three professors.

Ma Weimin rubbed his eyebrows, sighed and said: "I have a feeling that this is a new discovery, maybe it has something to do with something hidden in the NS equation."

Shu Qingzong shook his head: "According to what you said, it is impossible to really solve the NS equation."

Ma Gaoliang later sighed: "The Navier-Stokes equation, how difficult is it to solve this thing? Who can solve it?"

However, when Ma Gaoliang said these words, the three people were stunned, and then they all looked at Lin Xiao who was lowering his head to eat.

Lin Xiao took a mouthful of rice, raised his head and said, "Don't mention it, the food cooked by this chef is quite delicious. I recommend it to you..."

As a result, when he raised his head, he was stunned for a moment. Looking at those three pairs of eyes, he recalled the topic they had just talked about and said speechlessly: "Hey, don't look at me. That's the NS equation. I don't know how to do it." ah?"

"Hey, Professor Lin, let's stop talking about this. You've already solved a Hodge conjecture, not just an NS equation! Fuck him!"

Ma Gaoliang smiled and put his arm around Lin Xiao's shoulders and started talking.

Lin Xiao suddenly rolled his eyes, "What do you mean, 'just an NS equation'? I'm kidding, these are the seven major problems of the millennium, okay? I'll give you a pen and you can do it?"

Ma Gaoliang laughed, "Well, let's forget it."

But Ma Weimin next to him said at this time: "Professor Lin, no matter what, I still ask for your help. We are having trouble with direct numerical simulation. There is a high probability that it is because direct numerical simulation still cannot perfectly explain the movement of the fluid. After all, direct numerical simulation Simulation still has certain limitations, and if I can know the existence and smoothness of the solution to the NS equation, it will not only be very helpful to my research, but it will definitely be very helpful to the research of other things. .”

Then he also smiled and said: "Of course, I am not forcing others to make things difficult. After all, it is an NS equation. If Professor Lin can give me a little help, not to mention solving it, a little help will be fine."

"If you ask me, Academician Ma, just invite Professor Lin to join your research group."

Shu Qingzong next to him smiled.

Ma Weimin's eyes lit up, "Yes, Professor Lin, do you want to come to my research group?"

Hearing this, Lin Xiao thought for a short time, then nodded and said, "Okay, if Academician Ma invites you, of course I will come."

"Of course, I can't guarantee you that joining your research group will help you solve your problems."

"Haha, who doesn't know that Professor Lin has great magical powers? If you put any problem in your hands, it won't take long to solve it. I'm looking forward to it."

Ma Weimin laughed.

No matter what, it is obviously a huge help for Lin Xiao to join his research group.

Maybe then this problem that has troubled him for a long time will be solved with the addition of Lin Xiao?

Ma Gaoliang and Shu Qingzong next to them also laughed, and Shu Qingzong said even more enviously: "Old Ma... I'm talking about Academician Ma, you are so lucky, you can get such awesome things just by eating here. A help, I’m also suffering from a headache now.”

"Oh? What's your headache?"

"It's not that microwave weapon. Hey, forget it, it's not easy to deal with. Let's eat, let's eat. My food is cold."

The other three people all smiled. In scientific research, encountering problems is a common thing, so they basically didn't care and continued to eat.

Just like that, the meal was over.

And since Lin Xiao wanted to join Ma Weimin's project, the two of them naturally did not waste time. After eating, Lin Xiao went to Ma Weimin's laboratory.

The superconducting laboratory is quite large, and it also takes into account many aspects, especially the application research of room-temperature superconductors, so the laboratory where Ma Weimin works is also quite large.

After entering, you can see about a dozen people inside, doing corresponding work. In addition, there are many models placed in the middle of the laboratory, and there is also a magnetic fluid thruster made with CCD-I. frame.

Looking at this big guy, Lin Xiao couldn't help but sigh.

He didn't even know that everything here had been turned into this.

At this time, Ma Weimin clapped his hands and made everyone in the laboratory look at him. Ma Weimin smiled and said, "Let me tell you some good news. Director Lin has now officially joined our research group. Don't you welcome him?"

Hearing this and looking at Lin Xiao standing next to him, everyone in the laboratory applauded warmly: "Welcome, welcome! Warm welcome!"

Just kidding, this is the living Lin Shen.

Although they work in the Dingguang Research Institute, they rarely see Lin Xiao because they have been staying in the research institute. Now they not only saw Lin Xiao, but they were even able to work with Lin Xiao, and they were immediately happy. .

Lin Xiao also smiled and nodded at these people, and then went to the experimental platform with Ma Weimin.

"Professor Lin, let me first show you our recent underwater experiments and DNS simulations."

"Our launching tests are all in Wu City. I am from the Naval Engineering University, and our large experimental pool is also conducted there." Speaking of this, Ma Weimin said: "So if we want to conduct experiments, we may have to go there. Over at Wushi, you should be able to go there, right? Of course, if you can't go, we can."

Lin Xiao nodded: "Well, that's no problem."

"That's good. Of course, if something causes inconvenience to you, it won't affect you."

Ma Weimin said with a smile.

"OK."

"Um."

Ma Weimin nodded, then stopped talking nonsense and showed Lin Xiao the relevant data from their original experiment.

The first is direct numerical simulation.

Direct numerical simulation of DNS means directly substituting the predetermined values ​​into the Navier-Stokes equation, and then through a large number of calculations on the computer, finally simulating the motion of the turbulence model.

However, it is obvious that this has very high requirements on the computing power of the computer, and once the turbulence becomes complicated, it is difficult to obtain the desired results through direct numerical simulation, so it can generally only be used to simulate relatively simple turbulence. Model.

"You see, when we perform DNS on the turbulence model, the final result is very stable, and even our nuclear submarine can reach a maximum speed of 60 knots."

"Um."

Looking at the values ​​displayed on the model, Lin Xiao nodded, it was indeed very good.

The current speed of nuclear submarines is about 30-40 knots. If their nuclear submarines can reach a speed of 60 knots, that is nearly twice the speed. In actual combat, it is simply a dimensionality reduction strike. After one shot, the enemy will change places. No ship can keep up.

However, next, Ma Weimin opened another file, "This is our last water experiment. We conducted the experiment ten times in total, and each time the situation I mentioned before occurred."

Lin Xiao nodded, opened the file, and started reading.

Sure enough, everything was normal for the first hour, but then problems would occur at some point.

Looking at this result, Lin Xiao fell into thinking.

The problem is huge.

Why is there such a situation?

Undoubtedly, this is a very counterintuitive thing.

It has been running stably for so long, so why does it suddenly go into chaos?

Cause of electromagnetic fields?

Or is it due to fluid forces?

For a moment, Lin Xiao also felt a little embarrassed.

Finally, he found a piece of paper nearby, and then used a pen to draw the model and force analysis on the paper.

Ma Weimin next to him saw that Lin Xiao was thinking, so he stood by without disturbing him. Although he had made many achievements in this kind of problem that may involve top mathematical problems, he could only leave it to Lin Xiao at this time. This is the specialist.

When people around saw Lin Xiao solving the problem, they also gathered around and looked at what Lin Xiao drew on the paper.

They all know how difficult it is to solve the problems they encounter, so although they seem to have something to do, they are basically fishing for fish.

Now that they see a big boss coming, of course they are very curious.

Just like that, as time goes by.

After a while, Lin Xiao suddenly raised his head and said, "Send your turbulence model and I will add something to it."

Ma Weimin immediately sent their mathematical model of turbulence to Lin Xiao.

Lin Xiao modified some items in it, and then put it on the software to start testing.

At first, the turbulence in the software was still stable, but after about a minute, the turbulence suddenly became chaotic.

Seeing this scene, Ma Weimin and others around him suddenly showed expressions of surprise.

Lin Xiao found the reason just after getting started?

But just as they thought this, the turbulence on the software became full and stable again.

The whole place suddenly became quiet again.