Metropolis: My IQ is 300

Chapter 125

There are many problems in the world. Among these problems, the ns equation can definitely be ranked, and by solving this equation, you will solve the core of fluid dynamics.

What is the biggest effect of solving this? Quite simply, Chen Fan can achieve his goal without creating heat energy to get his armor into the air. It is to generate air propulsion in a real sense and achieve his goal.

Although the energy itself is sufficient, Chen Fan still wants to save some points.

After all, this is something carved into the bone.

"The school is ready for a holiday. In the evening, there will be a party. Will you attend?"

"No, I want to go home on New Year's Day, accompany my parents, and on the way, I will bring something back."

Qiu Hua nodded.

"That's okay. Tell me what you need. I go back and continue to urge the people on my side to do 5G. It really is. It's really a long, too long time."

Chen Fan nodded.

After sending Qiu Hua away, Chen Fan said, "Xiaomei, what do you think New Year's Day represents?"

"The beginning of the reunion new year and the end of the old year represent these, and New Year's Day seems to have many, many meanings."

"Yes, but I think New Year's Day is more for me to rest for three days."

"Come on, user."

Chen Fan rubbed his temples. Tao Yaoyao had already helped him pack his luggage. This time he went home without anyone accompanying Chen Fan.

Chen Fan plans to go home by himself.

Depart one day in advance.

After packing up, Chen Fan has already boarded the high-speed rail while the school students are still immersed in the joyful celebration.

Ready to go to Linshui.

High-speed rail Luocheng, Linshui has prioritized reforms and repaired the high-speed rail.

It can be said that the speed is extremely fast and only takes four hours.

At the ticket gate, Chen Fan took the ticket in his hand and handed it to the conductor. The conductor looked at it for a long time, then the system verified it and subconsciously planned to salute.

But Chen Fan refused.

General high-speed rail tickets, this is not something ordinary people have.

Get in the car and place the suitcase. Chen Fan's position is near the window. He calmly opened the book in his hand and started to read.

Chen Fan had the rocket's production drawings for a long time, but Chen Fan felt that it could still be optimized to make the rocket more stable.

Energy is not a problem, nuclear power is absolutely possible.

Satellites on rockets are not a problem. The combination of new artificial black holes and graphene can provide the best power and the clearest signal.

And Chen Fan has a selfish mind.

This selfishness comes from Xiaomei.

It may be that the sense of crisis in his bones makes Chen Fan feel that he has to do some tricks.

Chen Fan plans to put Xiaomei in space. In this way, he is equivalent to owning a satellite of his own. Then, when the time comes, he can quickly learn a lot of information.

But this has to be done secretly, this is Chen Fan's own secret.

Chen Qianqian is not far away. She needs to accompany Chen Fan, but cannot stand beside Chen Fan.

This kind of covert protection has always been needed, and Chen Fan couldn't stop it either.

In the car, there were two foreigners. When the high-speed rail started to accelerate, the air conditioner on the car made everyone feel particularly warm. The two foreigners took out their mobile phones and started shooting.

The speed is 250 kilometers per hour. At this speed, it is stable, and, when it is really sitting, there are coins standing on the high-speed rail, and they will not fall.

I used to think that the news might be bragging, but now it is true.

At this time, Chen Fan is calmly calculating the problem.

"It's really amazing. I heard that the last step of the high-speed rail was researched by Chen Fan."

"It feels that it's a lot closer in an instant. I used to go to the Imperial Capital to play and needed all kinds of inversions. Now, I feel that if I leave in the morning, I can actually come back in the afternoon."

"Yes, it's too fast, and I found that the plane seems to be fast too, and the price is even cheaper. Why is this?"

"It could have been cheap, but before only the plane was exclusive and fast, so the price has become expensive. Now everyone can take the high-speed rail, comfortable, and the speed is so fast, why not choose the high-speed rail."

"Moreover, I heard that the high-speed rail attendants are all based on the standards of flight attendants, and the salary is quite good, but they are also very clean, without any strange smell."

Chen Qianqian observed the people around him. It was the first time for everyone to take the high-speed rail. Obviously, he was curious about new things.

But the praise in his mouth made Chen Qianqian firm up his thoughts on protection.

"Chen Qianqian, your father's cancer is cured, the method given by Chen Fan."

"I know."

"In the future, even if you die, I don't want to see Chen Fan get hurt at all, understand?"

"Yes."

Accidents are always going on quietly. A girl came to Chen Fan's side, looked at her ticket, and said, "This is my seat."

Chen Fan nodded, got up and said, "Sorry, you sit down."

Chen Fan dragged the suitcase, came to the position between the carriages, and sat down comfortably.

Then continue to calculate the problem at hand.

The calculation of the ns equation is not so easy.

In theory, with the basic equations including the N-S equation, plus certain initial conditions and boundary conditions, the fluid flow can be determined. However, because the N-S equation has one more second derivative term than the Euler equation, it is difficult to find an exact solution of the equation except under certain conditions.

The simplest case where an exact solution can be obtained is parallel flow. The representative flow in this respect is the Hagen-Poiseuille flow in a circular tube and the Couette flow between two parallel plates.

In many cases, it is not necessary to solve the N-S equation, as long as the order of the N-S equation is analyzed, the characteristics of the solution can be determined, or the approximate solution of the equation can be obtained.

The ns equation is the most complete equation to solve the conservation of fluid energy.

This equation is also recognized by everyone, but there is no way to solve the final result. This has also become one of the most interesting problems in the millennium.

Before explaining the details of the Navier-Stokes equation, first, a few assumptions must be made about the fluid. The first is that the fluid is continuous. This emphasizes that it does not contain voids that form inside, for example, dissolved gas bubbles, and it does not contain the aggregation of mist-like particles. Another necessary assumption is that all involved fields are all differentiable, such as pressure, velocity, density, temperature, and so on. The equation is derived from the basic principles of conservation of mass, momentum, and energy. In this regard, sometimes a limited arbitrary volume must be considered, called the control volume, on which these principles are easy to apply. This finite volume is recorded as, and its surface is recorded as. The control volume can be fixed in space, or it can move with fluid.

Chen Fan rubbed his temples and turned over the draft paper in his hand. His first attempt failed.

Because I don’t know the specific data, maybe the experiment can be.

However, the significance of ns to the current Chen Fan is indeed very important. It solves it, saves traffic, and can even deal with the problem of sea water ebb and flow clearly, and even the blood flow inside the human body in the future can be solved.

Because the core of the ns equation is to solve the fluid problem.

What is fluid? Anything that flows is fluid.

It seems that I still need to continue to work hard.

After sitting for a while, Chen Fan sat in his suitcase, leaning on the back of the corridor, and sat with peace of mind.

A flight attendant on the high-speed rail, the general office of the high-speed rail, received a call.

"There is a special talent in the car."

"Who?"

"It's Chen Fan."

Chen Fan"?

Damn it, why did this guy come? You know, Chen Fan was named the father of high-speed rail. This kind of big man got on the high-speed rail, wouldn't it be here to check?

"Where to sit, you know?"

"It's arranged in Car 3, what's wrong?"

The person in charge hurried to Car 3, and when he got to the place, he saw Chen Fan sitting on the ground. The person in charge felt that his position might not be guaranteed.

"This, what are you?"

"Nothing, the position is someone else's."

Damn it, forgot about it, wait, whoever big guy is okay to take the high-speed rail, isn't it embarrassing for you?

But the person in charge still arranged a position for Chen Fan very intimately, to a special compartment.

Many people looked at this young man, as if he had an unusual identity.

"Is it Chen Fan?"

"The feeling is that this car is heading towards Linshui. I have heard that the housing prices in Linshui have risen. It seems that it is because of the existence of Chen Fan 0..."

"It feels like it is."

There was discussion, but Chen Fan didn't care. The person in charge invited Chen Fan to the cab. Chen Fan briefly looked at it and said, "Manually controlled?"

'Yes. ’

Chen Fan nodded and said, ‘I think it’s okay. Keep it up. Don’t use programs. Program manipulation is too dangerous. ’

"Yes, we have always adopted a manual control model in our country, and people are the most trustworthy."

Chen Fan hummed.

Because of the existence of Xiaomei, Chen Fan's fear of technology has increased a little bit. Technology may be used to kill people, which is very easy to do.

Chen Fan continued to calculate the ns equation.

The person in charge scanned it, and looked at the pile of texts, and his head got a headache.

Air is composed of a large number of molecules, and the molecules perform random thermal motion. We can imagine that with the gradual decrease of the observation scale, the physical quantities such as the velocity, density and temperature of the fluid in the microscopic situation cannot be the same as the macroscopic situation, and the physical quantities are intermittent. Phenomenon, for example, when we take out a control body in space, when there are molecules in the control body, the density of the control body is equivalently large, and it will be 0 when it does not exist. This is common at the microscopic scale. However, as the observation scale increases, in the macroscopic situation, the control volume contains a large number of molecules, and there is a statistical average result for the pressure density, temperature and speed of the control volume. This result is stable. For example, the pressure density and temperature of the flow field variables meet the ideal The gas equation of state.

How should I say, these words can be understood by looking at them individually, but if they are combined together, there is no way to know them.

"Well, do you need a quiet environment?"

"No, I can do work in any environment. By the way, I will ask you a question."

Ask me a question?

Ask me what question, where do I know the answer to the question, you are a master, but I am not a master.

"You said, how can the speed become faster?"

"I don't know, but I think, that is, more gasoline?"

"No, suppose you are riding a motorcycle, how do you get faster?"

"Lower your body and reduce the wind as much as possible."

Chen Fan nodded and said thank you.

At this time the car reached the place.

Chen Fan got out of the car.

The person in charge presented Chen Fan.

With a foggy face, could it be that he answered the wrong question?

How could Xueba ask himself such a strange question.

"After all, the macroscopic fluid motion in nature occupies the majority. The NS equation defines its applicable condition as macroscopic motion. The slightly more technically difficult term is that the fluid satisfies the continuum assumption. The continuum assumption means that we are in the flow field. Randomly take out the fluid micelles in the macroscopically, the fluid micelles are infinitely small, so the physical quantity of the entire flow field can be subjected to mathematical limit differential and integral operations; at the same time, the fluid micelles are infinite on the microscopic level. It contains a large number of molecules, so that it can be statistically averaged at the molecular level to obtain the flow field variables we usually see."

Chen Fan said that the ns equation should actually deal with microscopic problems, but Chen Fan felt that it could be dealt with from a macro perspective.

Maybe you will get unexpected results.

"be careful."

Chen Fan looked up and looked at Chen Qianqian.

"Sorry, thinking about something."

"I now suspect that you may not need others to kill you. In fact, you will die. You will die on the road and be hit to death."

"Oh, well, I'm a little fascinated. It seems that I still haven't learned well enough, and I still have to work hard."

Is this the way that Xueba pretends?

"By the way, where do you live?"

Chen Fan asked curiously, Chen Qianqian said: ‘I don’t know, you arranged it, it is estimated to live in your house. ’

"You have a gun?"

"I have even more weapons."

"Cowhide, try not to be seen by my parents, thank you."

"I have a hunch, I might go home with you this time, I will kill."

"why?"

"I am worried that the matter of Brother Dayi will happen in your house, and according to the regulations, if the person threatening you exists, I can shoot directly."

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